PATENTS

23 A. Kalitsov, D. A. Stewart, A. Kaushik, and G. Bertero , "Magnetoresistive memory device and method of operating same using ferroelectric-controlled exchange coupling", U. S. Patent 12,211,535 (2025)

22 A. Kalitsov, D. A. Stewart, A. Kaushik, and G. Bertero , "Magnetoresistive memory device and method of operating same using ferroelectric-controlled exchange coupling", U. S. Patent 12,106,790 (2024)

21 A. Kalitsov, D. A. Stewart, and B. Prasad , "Voltage-controlled magnetic anisotropy memory device including an anisotropy-enhancing dusting layer and methods for forming the same", U. S. Patent 11,889,702 (2024)

20 D. A. Stewart, A. Kalitsov, and B. Prasad , "Voltage-controlled magnetic anisotropy memory device including an anisotropy-enhancing dusting layer and methods for forming the same", U. S. Patent 11,887,640 (2024)

19 A. Kalitsov, D. A. Stewart, and B. Prasad , "Voltage-controlled magnetic anisotropy memory device including an anisotropy-enhancing dusting layer and methods for forming the same", U. S. Patent 11,871,679 (2024)

18 A. Kalitsov, D. A. Stewart, B. Prasad, and G. Mihajlovic , "Magnetoresisitive memory device including a plurality of reference layers", U. S. Patent 11,839,162 (2022)

17 B. Prasad, D. A. Stewart, M. Carey, and T. Santos, "Spinel containing magnetic tunnel junction and method of making the same", U. S. Patent 11,443,790 (2022)

16  A. Kalitsov, B. Prasad, and D. A. Stewart, "Magnetic tunnel junction memory devices employing resonant tunneling and methods of manufacturing the same",   U. S. Patent 11,417,379 (2022)

15 A. Kalitsov, B. Prasad, and D. A. Stewart, "Magnetic tunnel junction memory devices employing resonant tunneling and methods of manufacturing the same",    U. S. Patent 11,411,170 (2022)

14 A. Kalitsov, B. Prasad, and D. A. Stewart, "Magnetic tunnel junction memory devices employing resonant tunneling and methods of manufacturing the same",    U. S. Patent 11,349,066 (2022)

13 D. A. Stewart, J. Read, and M. Grobis, "Memory device containing selector with current focusing layer and methods of making the same", U. S. Patent 11,271,040 (2022)

12  A. Kalitsov, D. A. Stewart, D. Bedau, and G. Bertero, "Ferroelectric memory devices employing conductivity modulation of a thin semiconductor or a two-dimensional charge carrier gas and methods of operating the same", U. S. Patent 11,271,009 (2022)

11 B. Prasad, D. A. Stewart, and B. Terris, "Spinel containing magnetic tunnel junction and method of making the same", U. S. Patent 11,217,289 B1 (2022)

10 B. Prasad, D. A. Stewart, and B. Terris, "Spinel containing magnetic tunnel junction and method of making the same", U. S. Patent 11,176,981 B1 (2021)

9  M. Grobis, J. Nag, and D. A. Stewart, "Memory device containing ovonic threshold switch material thermal isolation and method of making the same", U. S. Patent 11,031,435 B2 (2021)

8  A. Kalitsov, D. A. Stewart, and G. Bertero, "Voltage-controlled interlayer exchange coupling magnetoresistance memory device and method of operating thereof", U. S. Patent 10,788,547 B2 (2020)

7  A. Kalitsov, D. A. Stewart, D. Bedau, and G. Bertero, "Ferroelectric memory devices employing conductivity modulation of a thin semiconductor or a two-dimensional charge carrier gas and methods of operating the same", U. S. Patent 10,700,093 B1 (2020)

6  R. Ruiz, J. Lille, M. D. Apodaca, D. A. Stewart, and B. Terris, "Nanoparticle-based resistive memory device and methods for manufacturing the same", German Patent 3571728 (2020)

5  M.Grobis, D. A. Stewart, and B. D. Terris, "Methods and apparatus for three-dimensional non-volatile memory", U. S. Patent 10,553,647 B2 (2020)

4  D. A. Stewart, D. Bedau, M. Grobis, and C. Petti, "Electrostatic discharge protection devices including a field-induced switching element", U. S. Patent 10,388,646 B1 (2019)

3  M. Grobis, D. A. Stewart, and B. D. Terris, "Methods and apparatus for three-dimensional non-volatile memory", U. S. Patent 10,355,049 B1 (2019)

2  R. Ruiz, J. Lille, M. D. Apodaca, D. A. Stewart, and B. Terris, "Nanoparticle-based resistive memory device and methods for manufacturing the same", U. S. Patent 10,290,804 B2 (2019)

1  Y.-S. Choi, K. A. Allan, and, D. A. Stewart, "Magnetoresistive effect devices having enhanced magnetic anisotropy", U. S. Patent 9,564,581 B1. (2017)

PUBLICATIONS

66 D. A. Stewart, J. W. Reiner, J. C. Read, M. K. Grobis, "Evidence of Avalanche Multiplication in GeSeAs Ovonic Threshold Switch Selectors", ACS Applied Electronic Materials,  7, 4200 (2025).

65 A. Surampalli, A. K. Bera, R. Chopdekar, A. Kalitsov, L. Wan, J. Katine, D. A. Stewart, T. Santos, and B. Prasad "Voltage Controlled Interlayer Exchange Coupling and Magnetic Anisotropy Effects in Perpendicular Magnetic Heterostructures", Advanced Functional Materials 2408599 (2024).

64 O. L. W. McHugh, M. Gradhand, and D. A. Stewart, "Optimizing the Spin Hall effect in Pt based binary alloys", Physical Review Materials, 8, 015003 (2024).

63 K. Hellier, D. A. Stewart, J. Read, R. Sfadia, S. Abbaszadeh, "Tuning Amorphous Selenium Composition with Tellurium to Improve Quantum Efficiency at Long Wavelengths and High Applied Fields", ACS Applied Electronic Materials, 5, 2678 (2023).

62 M. Al Chawa, D. Bedau, A. S. Demirkol, J. W. Reiner, D. A. Stewart, M. K. Grobis, "A Compact Model of Threshold Switching Devices for Efficient Circuit Simulations", IEEE Transactions on Circuits and Systems I, 70, 4530 (2023) doi: 10.1109/TCSI.2023.3302995.

61 S. K. Achar, J. Schneider, and D. A. Stewart, "Using Machine Learning Potentials to Explore Interdiffusion at Metal-Chalcogenide Interfaces", ACS Applied Materials and Interfaces, 14, 56963 (2022).

60 F. Ibrahim, A. Hallal, A. Kalitsov, D. A. Stewart, B. Dieny, M. Chshiev, "Unveiling Temperature-Dependence Mechanismss of Perpendicular Magnetic Anisotropy at Fe/MgO Interfaces", Physical Review Applied, 17, 054041 (2022).

59 D. A. Stewart, O. L. W. McHugh, W. F. Goh, M. Gradhand, "Using dopants and alloying to optimize Spin Hall materials for MRAM devices", 2021 32nd Magnetic Recording Conference (TMRC), (2021).

58 J. C. Read, D. A. Stewart, J. W. Reiner, B. D. Terris, "Evaluating Ovonic Threshold Switching Materials with Topological Constraint Theory", ACS Applied Materials and Interfaces, 13, 37398 (2021).

57 K. Aryana, D. A. Stewart, J. T. Gaskin, J. Nag, J. C. Read, D. H. Olson, M. K. Grobis, P. E. Hopkins, "Tuning network topology and vibrational model localization to achieve ultralow thermal conductivity in amorphous chalcogenides", Nature Communications, 12, 2817 (2021).

56 K. Aryana, J. T. Gaskin, J. Nag, D. A. Stewart, Z. Bai, S. Mukhopadhyay, J. C. Read, D. H. Olson, E. R. Hoglund, J. M. Howe, A. Giri, M. K. Grobis, P. E. Hopkins, "Interface controlled thermal resistance of ultra-thin chalcogenide-based phase change memory devices", Nature Communications, 12, 774 (2021).

55 O. L. W. McHugh, W. F. Goh, M. Gradhand, D. A. Stewart, "Impact of impurities on the spin Hall conductivity in β-W", Physical Review Materials, 4, 094404 (2020).

54 D. A. Stewart, “Diffusion of oxygen in amorphous tantalum oxide”, Physical Review Materials, 3, 055605 (2019).

53 M. Ashton, D. Gluhovic, S. B. Sinnott, J. Guo, D. A. Stewart, and R. G. Hennig, “Two-Dimensional Half-Metals with Large Spin Gaps”, Nano Letters, 17, 5251 (2017).

52 H. Jiang and D. A. Stewart, “Using Dopants to Tune Oxygen Vacancy Formation in Transition Metal Oxide Resistive Memory”, ACS Applied Materials and Interfaces, 9, 16296 (2017).

51 B. Magyari-Kope and D. A. Stewart, "Introduction to the special issue on computational electronics of emerging memory elements", Journal of Computational Electronics, 16, 995 (2017).

50 Y.-S. Choi, T. Nakatani, J. C. Read, M. J. Carey, D. A. Stewart, and J. R. Childress, "Enhancement of current-perpendicular-to-the-plane-giant-magnetoresistance (CPP-GMR) by insertion of amorphous ferrromagnetic underlayer in Heusler alloy-based spin-valve structures", Applied Physics Express, 10, 013006 (2017).

49 H. Jiang and D. A. Stewart, “Enhanced Vacancy Diffusion in Ta2O5 Resistive Memory Devices due to Infinitely Adaptive Oxide Crystal Structure”, Journal of Applied Physics, 119, 134502 (2016).

48 M. R. Page, T. M. Nakatani, D. A. Stewart, B. R. York, J. C. Read, Y.-S. Choi, and J. R. Childress, “Temperature dependence of current-perpendicular-to-plane giant magnetoresistance spin-valves using Co2(Mn1−xFex)Ge Heusler alloys”, Journal of Applied Physics, 119, 153903 (2016).

47 H. Peng, N. Kioussis, D. A. Stewart, “Anisotropic lattice thermal conductivity in chiral tellurium from first principles”, Applied Physics Letters, 107, 251904 (2015).

46 X. Chen, A. Weathers, J. Carrete, S. Mukhopadhyay, O. Delaire, D. A. Stewart, N. Mingo, S. N. Girard, J. Ma, D. L. Abernathy, J. Yan, R. Sheshka, D. P. Sellan, F. Meng, S. Jin, J. Zhou, L. Shi, “Twisting phonons in complex crystals with quasi-one-dimensional substructures”, Nature Communications, 6, 6723, (2015).

45 S. Mukhopadhyay, T. Thompson, J. Sakamoto, A. Huq, J. Wolfenstine, J. L. Allen, N. Bernstein, D. A. Stewart, M. D. Johannes, “Structure and Stoichiometry in Supervalent Doped Li7La3Zr2O12”, Chemistry of Materials, 27, 3658 (2015).

44 S. Mukhopadhyay and D. A. Stewart, “Polar Effects on the Thermal Conductivity of Cubic Boron Nitride under Pressure”, Physical Review Letters, 113, 025901 (2014).

43 S. Mukhopadhyay and D. A. Stewart, “A First Principle Study of the Phonon Dispersion of Wurtzite InP: Role of In 4d Electrons”, Physical Review B, 89, 054302 (2014). (pdf)

42 J. B. Hertzberg, M. Aksit, O. O. Otelaja, D. A. Stewart, and R. D. Robinson, “Direct measurement of surface scattering in Si nanosheets using a microscale phonon spectrometer: implications for Casimir-Limit Predicted by Ziman Theory”, Nano Letters, 14, 403 (2014).

41 N. Mingo, D. A. Stewart, and D. A. Broido, (Invited Book Chapter) Ab-Initio Thermal Transport, in the book Length Scale Dependent Phonon Interactions, edited by S. L. Shinde and G. P. Srivastava, Springer-Verlag (2013).

40 W. Li, L. Lindsay, D. A. Broido, D. A. Stewart, and N. Mingo, “Thermal conductivity of bulk and nanowire Mg2SixSn1−x alloys from first principles”, Physical Review B, 86, 174307 (2012). (pdf)

39 Z. Boekelheide, D. A. Stewart, and F. Hellman, “Chemical ordering in Cr3Al and relation to semiconducting behavior”, Physical Review B, 86, 085120 (2012). (pdf)

38 W. Li, N. Mingo, L. Lindsay, D. A. Broido, D. A. Stewart, and N. A. Katcho, “Thermal conductivity of diamond nanowires from first principles”, Physical Review B, 85, 195436 (2012). (pdf)

37 D. A. Stewart, “A cautionary tale of two basis sets and graphene”, Computing in Science and Engineering, 14, 15 (2012).

36 Z. Boekelheide, T. Saerbeck, A. Stampfl, R. A. Robinson, D. A. Stewart, F. Hellman, “Antiferromagnetism in Cr3Al and relation to semiconducting behavior”, Physical Review B, 85, 094413 (2012). (pdf)

35 D. A. Stewart and K. A. Mkhoyan, (Invited Book Chapter) Graphene Oxide: Synthesis, Characterization, Electronic Structure, and Applications in the book Graphene Nanoelectronics, edited by H. Raza, Springer-Verlag (2012).

34 A. Kundu, N. Mingo, D. A. Broido, D. A. Stewart, “The role of lighter and heavier embedded nanoparticles on the thermal conductivity of SiGe alloys”, Physical Review B, 84, 125426 (2011). (pdf)

33 F. Zhou, A. L. Moore, J. Bolinsson, A. Persson, L. Fröberg, M. T. Pettes, H. Kong, L. Rabenberg, P. Caroff, D. A. Stewart, N. Mingo, K. A. Dick, L. Samuelson, H. Linke, L. Shi “Thermal conductivity of indium arsenide nanowires with wurtzite and zinc blende phases”, Physical Review B, 83, 205416 (2011). (pdf)

32 Z. Boekelheide, A. X. Gray, C. Papp, B. Balke, D. A. Stewart, S. Ueda, K. Kobayashi, F. Hellman, and C. S. Fadley, “Band gap and electronic structure of an epitaxial, semiconducting Cr0.80Al0.20 thin film”, Physical Review Letters, 105, 236404 (2010). (pdf)

31 P. E. Hopkins, M. L. Bauer, J. C. Duda, J. L. Smoyer, T. S. English, P. M. Norris, T. E. Beechem, and D. A. Stewart, “Ultrafast thermoelectric properties of noble metals under conditions of strong electron-phonon nonequilibrium”, Journal of Applied Physics, 108, 104907 (2010). (pdf)

30 D. A. Stewart, “A new type of magnetic tunnel junction based on spin filtering through a reduced symmetry oxide: FeCo|Mg3B2O6|FeCo”, Nano Letters, 10, 263 (2010).

29 N. Mingo, K. Esfarjani, D. A. Broido, and D. A. Stewart, “Cluster scattering effects on phonon conduction in graphene”, Physical Review B, 81, 045408 (2010). (pdf)

28 K. A. Mkhoyan, A. Contryman, J. Silcox, D. A. Stewart, E. Goki, C. Mattevi, S. Miller, and M. Chhowalla, “Atomic and Electronic Structure of Graphene-Oxide”, Proceedings of the 2010 Microscopy and Microanalysis Conference, August 1-5, Portland, OR (2010).

27 A. Ward, D. A. Broido, D. A. Stewart, G. Deinzer, “Ab-initio theory of the lattice thermal conductivity in diamond”, Physical Review B, 80, 125203 (2009). (pdf)

26 P. E. Hopkins and D. A. Stewart, “Contribution of d-band electrons to ballistic transport and scattering during electron-phonon nonequilibrium in nanoscale Au films using an ab-initio density of states”, Journal of Applied Physics, 106, 053512 (2009). (pdf) 

25 K. A. Mkhoyan, A. W. Contryman, J. Silcox, D. A. Stewart, G. Eda, and M. Chhowalla, “Atomic and electronic structure of graphene-oxide”, Nano Letters, 9, 1058 (2009).

24 D. A. Stewart, I. Savić, and N. Mingo, “First-principles calculation of the isotope effect on boron nitride nanotube thermal conductivity”, Nano Letters, 9, 81 (2009).

23 I. Savić, D. A. Stewart, and N. Mingo, “Thermal conduction mechanisms in boron nitride nanotubes: few shell versus all-shell conduction?”, Physical Review B, 78, 235434 (2008). (pdf)

22 I. Savić, N. Mingo, and D. A. Stewart, “Phonon transport in isotope-disordered carbon and boron-nitride nanotubes: is localization observable?”, Physical Review Letters, 101, 165502 (2008) (pdf).

21 D. A. Broido, N. Mingo, and D. A. Stewart, “Phonon thermal transport in bulk and nanostructured materials from first principles”, Proceedings of the 2008 ASME International Mechanical Engineering Congress and Exposition, IMECE2008-67049 (2008).

20 E. K. Yu, D. A. Stewart, and S. Tiwari, “Ab-initio study of polarizability and induced charge densities in multilayer graphene films”, Physical Review B, 77, 195406 (2008). (pdf)

19 D. A. Stewart, “Ab-initio investigation of phonon dispersion and anomalies in palladium”, New Journal of Physics, 10, 043025 (2008). (pdf)

18 N. Mingo, D. A. Stewart, D. A. Broido, and D. Srivastava, “Phonon transmission through defects in carbon nanotubes from first principles”, Physical Review B, 77, 033418 (2008). (pdf)

17 D. A. Broido, M. Malorny, G. Birner, N. Mingo, and D. A. Stewart, “Intrinsic lattice thermal conductivity of semiconductors from first principles”, Applied Physics Letters, 91, 231922 (2007). (pdf)

16 E. Y. Tsymbal, K. D. Belashchenko, J. P. Velev, S. S. Jaswal, M. van Schilfgaarde, I. I. Oleinik, and D. A. Stewart, (Review Article) “Interface effects in spin-dependent tunneling”, Progress in Materials Science, 52, 401 (2007).

15 D. A. Stewart, “Magnetism in coaxial palladium nanowires”, Journal of Applied Physics, 101, 09D503 (2007). (pdf)

14 F. Léonard and D. A. Stewart, “Properties of short channel ballistic carbon nanotube transistor with ohmic contacts”, Nanotechnology, 17, 4699 (2006).

13 J. Velev, K. D. Belashchenko, D. A. Stewart, M. van Schilfgaarde, S. S. Jaswal, and E. Y. Tsymbal, “Negative spin polarization and large tunneling magnetoresistance in epitaxial Co/SrTiO3/Co magnetic tunnel junctions”, Physical Review Letters, 95, 216601 (2005).

12 S. Faleev, F. Léonard, D. A. Stewart, and M. van Schilfgaarde, “Ab-initio TB-LMTO method for non-equilibrium electron transport in nanosystems”, Physical Review B, 71, 195422 (2005).

11  D. A. Stewart and F. Léonard, “Energy Conversion Efficiency in Nanotube Optoelectronics”, Nano Letters, 5, 219 (2005).

10 D. A. Stewart and F. Léonard, “Photocurrents in Nanotube Junctions”, Physical Review Letters, 93, 107401 (2004).

9  K. D. Belashchenko, E. Y. Tsymbal, M. van Schilfgaarde, D. A. Stewart, I. I. Oleinik, and S. Jaswal, “Spin-dependent tunneling from clean and oxidized Co surfaces”, Journal of Magnetism and Magnetic Materials, 272-276, 1954 (2004).

8  K. D. Belashchenko, E. Y. Tsymbal, M. van Schilfgaarde, D. A. Stewart, I. I. Oleinik, and S. Jaswal, “Effect of Interface Bonding on Spin-Dependent Tunneling from oxidized Co Surfaces”, Physical Review B, 69, 174408 (2004).

7  D. A. Stewart, W. H. Butler, X.-G. Zhang, and V. F. Los, “Interfacial Scattering in Magnetic Multilayers and Spin Valves”, Physical Review B, 68, 014433 (2003).

6  D. A. Stewart and M. van Schilfgaarde, “Digitally doped magnetic resonant tunneling devices: High tunneling magnetoresistance systems”, Journal of Applied Physics, 93, 7355 (2003).

5  I. Angelini, M. Garstang, S. Macko, R. Swap, D. Stewart, and H. Cunha, (Book Chapter) Isotopic Variations and Internal Storm Dynamics in the Amazon Basin, in Cloud Systems, Hurricanes, and the Tropical Rainfall Measuring Mission (TRMM), Meteorological Monographs, 29, no. 51, 81-93, edited by W.-K Tao and R. Alder, American Meteorological Society, Boston, (2003).

4  D. A. Stewart, "Effect of Diffusive Scattering on Giant Magnetoresistance in Magnetic Multilayers", Ph. D. Dissertation, University of Virginia, (2001).

3  D. A. Stewart and P. M. Norris, “Size Effects on the Thermal Conductivity of Thin Metallic Wires: Microscale Implications”, Microscale Thermophysical Engineering, 4, 89, (2000).

2 D. A. Stewart, "Surface and Size Effects on the Thermal Conductivity of Microscale Metallic Structures," Masters of Science Thesis, University of Virginia, (1998).

1 J. L. Hostetler, D. Stewart, C. E. Daitch, C. A. Ashley, and P. M. Norris, “Optical Polarized Reflectance Characterization of Thin Aerogel and Xerogel Films", Journal of Non-Crystalline Solids, 225, 19, (1998).

"Dealing with Disorder: Tailoring Network Topology to Achieve Ultralow Thermal Conductivity in Amorphous Chalcogenide Alloys Relevant for Non-Volatile Memory", (invited talk) Workshop on Transport at the Nanoscale, Telluride Science Research Center (TSRC), Telluride, CO,  June 22nd, 2022. 

"Dealing with the Data Deluge: Using First Principle Simulations and Machine Learning to develop Chalcogenide Alloys for Memory Applications", (invited talk), University of California at Santa Cruz (UCSC), Santa Cruz, CA May 5th, 2022 

"Combining First Principle Simulations, Topological Constraint Theory, and Experiments to optimize OTS Chalcogenide Alloys", (invited talk) Intersect 2021 - International Workshop on Advanced Materials-to-Device Solutions for Synaptic Electronics, Barcelona, Spain, November 11th, 2021. 

"Using Dopants and Alloying to Optimize Spin Hall Materials for MRAM", (invited talk) 32nd Magnetic Recording Conference (TMRC) (virtual),  August 17th, 2021

"Quantum Curve Balls, 2D Half Metals, and the Search for New Magnetic Memories”, (invited talk) Carnegie Mellon University, Pittsburgh, PA, February 4th, 2020

“Ab-Initio Material Design for Non-Volatile Memory”, (invited talk) Advanced Simulation Approaches for Non-Volatile Memory Workshop, CEA-LETI Innovation Days, Grenoble, France, June 28th, 2019

"Optimizing MRAM: A Computational Exploration of spin Hall materials and 2D half metals", (invited talk) University of Alabama, Tuscaloosa, AL, April 25th, 2018

"MRAM at the Atomic Edge: The Search for Magnetic 2D materials" (invited plenary talk), 58th Sanibel Symposium, St. Simons, Georgia, February 21st, 2018.

"Computational Material Science Outside of the Ivory Towers", (invited talk), University at Buffalo Symposium on Job and Career Perspectives for Students in the Computational Sciences, Buffalo, NY, April 14th, 2017.

"First principles approaches to optimize materials for non-volatile memory", (invited talk), Computational Materials Discovery and Optimization Symposium at the 2017 Annual TMS Meeting, San Diego, CA, February 26th, 2017 

"Ab-Initio Design of Oxides for Non-Volatile Memory", (invited talk), Electronics Materials and Applications Conference EMA 2017, Orlando, Florida, January 20th, 2017.

"Ab-Initio Insight into Vacancy Formation and Diffusion in Resistive RAM Oxides", NVM Workshop: New Horizons for Memory Storage, Trinity College, Dublin, Ireland, June 30th, 2016.

"Advancing Non-Volatile Memory Research with Atomistic Simulations", (invited talk), University of Nebraska MRSEC Industry Workshop, Lincoln, Nebraska, March 25, 2016.

"The role of one dimensional and nanoscale structural motifs in bulk thermal transport", (invited talk), Hot Nanostructures: Thermal Transport and Radiation at the Nanoscale, CECAM Workshop, Mainz, Germany, October 1, 2015.

"Nanoscale Thermal Transport for the Digital World", (invited talk), TransLES-2014: Transport Properties in Low Dimensional Systems: Experiment and Simulation, IASST, Guwahati, India, December 12, 2014.

"First Principle Approaches for Spins and Phonons", (invited talk), HGST, a Western Digital Company, San Jose, CA, April 7th, 2014.

"From Spins to Phonons: Applying Transport Lessons to First Principles Heat Transfer", (invited plenary speaker), 54th Sanibel Symposium, St. Simons, Georgia, February 18th, 2014.

"A First Principle Framework for Thermal Transport in Energy Materials", (invited talk), Binghamton University, Binghamton, NY, February 13th, 2014.

"Using Phonon Engineering of Materials to Aid in Energy Conservation", (invited talk) Derek Stewart, UCLA Institute of Pure and Applied Mathematics (IPAM) Workshop on Energy Conservation and Waste Heat Recovery, UCLA, Los Angeles, November 20th, 2013.

"First Principles Design of Thermoelectrics", (invited talk) Derek Stewart, Materials Science and Engineering Department Seminar, University of Virginia, Charlottesville, VA, November 11, 2013.

"Tailoring Thermal Properties in Nanostructured Energy Materials", (invited talk) Derek Stewart, Thermal Transport at the Nanoscale Workshop, Telluride Science Research Center, Telluride, CO, June 28, 2013.

"First principles thermal transport in nanostructured thermoelectric alloys and nanowires", (invited talk) Derek Stewart, 2013 Spring Materials Research Society (MRS) Meeting, Symposium V: Nanoscale Heat Transfer: From Fundamentals to Devices, San Francisco, CA, April 4, 2013.

"Designing Thermal Transport in Energy Materials: A First Principle Approach", (invited talk), Derek Stewart, A. Kundu, W. Li, L. Lindsay, N. Mingo, and D. A. Broido, 244th annual American Chemical Society Meeting, Philadelphia, PA, August 23, 2012.

"First Principles Framework for Thermal Transport", Derek Stewart, (invited talk) Carnegie Mellon University, Pittsburgh, PA, July 16th, 2012.

"Ab-Initio Calculation of Phonon Transport in Crystalline and Disordered Materials", Derek Stewart, (poster), NSF 2012 CBET Grantee Conference, Baltimore, Maryland, June 6th-8th, 2012.

"An Introduction to First Principles Thermal Conductivity", Derek Stewart, (invited talk and tutorial), IWCE Phonon School, Madison, Wisconsin, May 22nd, 2012.

"Ab-initio Thermal Conductivity for Thermoelectric Nanostructured Materials", D. A. Stewart, A. Kundu, N. Mingo, A. Ward, D. A. Broido, 2012 TMS Meeting, Orlando, FL, March 14th, 2012.

"Ab-Initio Heat Transfer in Materials and Nanostructures" (invited talk) Symposium W, Fall MRS Meeting 2011 Nov. 30th, 2011.

"Ab-Initio Foundation for Thermal Transport" (invited talk) University of Exeter, Exeter, UK, October 25th, 2011.

"First Principles Thermal Transport: Learning how to orchestrate Phonons", (invited talk) Nanomaterials Theory Institute, Oak Ridge National Laboratory, Oak Ridge, TN, October 20th, 2011.

"Phonons by Design: Using Density Functional Theory to understand and engineer thermal transport in materials and nanostructures", California State University Northridge, Northridge, California, (invited talk) Sept. 28th, 2011.

"First principles thermal transport in materials and nanostructures with energy applications", (invited talk), Cornell Material Science and Engineering Department Colloquium, Cornell University, Ithaca, NY Sept. 22nd, 2011.

"A density functional approach for predicting thermal transport in materials and nanostructures", (poster), New York Academy of Sciences Gotham-Metro Condensed Matter Meeting, New York Academy of Sciences, New York, NY April 15th, 2011.

"Ab-initio heat transfer: Predicting thermal transport in nanostructures and materials from the atoms up", (invited talk) Condensed Matter Seminar Series, Case Western Reserve University, Cleveland, Ohio, April 4th, 2011.

"The prospect of magnetic tunnel junctions based on reduced symmetry oxides", (invited plenary speaker), 51st Sanibel Symposium, St. Simons, Georgia, February 26th, 2011. 

"Developing a Virtual Vault for Pseudopotentials: A NNIN/C Initiative", D. A. Stewart, Nanoinformatics 2010, Arlington, VA, November 4th, 2010.

"Keeping Nano Cool... A First Principles Approach to Understanding and Potentially Controlling Nanoscale Thermal Transport", (invited talk) D. A. Stewart, 2010 CNF Annual Meeting, Cornell University, Ithaca, September 16, 2010.

"Predicting thermal transport in nanostructures and materials from first principles", (invited talk) D. A. Stewart, Nebraska Center for Nanoscience and Materials, University of Nebraska, Lincoln, NE, April 22, 2010.

"A novel reduced symmetry oxide (Mg3B2O6) for FeCo or Fe magnetic tunnel junctions", D. A. Stewart, APS March Meeting, Portland, OR, March 16, 2010.

"A new type of magnetic tunnel junction based on a reduced symmetry oxide: Mg3B2O6: How a supporting actor (Boron) could steal the show...", D. A. Stewart, University of California at Berkeley, February 22, 2010

"Thermal transport in disordered nanostructures: a first principles perspective", D. A. Stewart, Thermoelectric Transport: Progress in First Principles and Other Approaches, CECAM Workshop, Lausanne, Switzerland, July 23, 2009

"Spin dependent transport in FeCo|MgBO|FeCo magnetic tunnel junctions: Can boron in the oxide region be a good thing", D. A. Stewart, APS March Meeting, Pittsburgh, PA, March 20, 2009.

"A first principle framework for thermal transport in nanostructures and materials", (invited talk) Derek Stewart, Naval Research Laboratory, Dec. 8th, 2008.

"A first principles approach to thermal transport in materials and nanostructures" D. A. Stewart, Computational Materials Seminar, Cornell University, Nov. 19th, 2008.

"An ab-initio study of the impact of oxide layer boron in the tunneling magnetoresistance of FeCoB/MgO(B)/FeCoB junctions", D. A. Stewart, 53rd annual conference on Magnetism and Magnetic Materials, Austin, TX Nov. 13th, 2008.

"The impact of isotopes on the thermal conductivity of boron nitride nanotubes", (poster) D. A. Stewart, I. Savic, N. Mingo, 6th Japan-US Joint Seminar on Nanoscale Transport Phenomena, Boston, MA, July 15th, 2008

“A first principles perspective on thermal transport in nanostructures with defects”, D. A. Stewart, I. Savic, N. Mingo, APS March Meeting, New Orleans, LA March 12th, 2008.

“A unified approach to nanoscale charge and energy transport”, (invited talk), D. A. Stewart, Wake Forest University, Winston-Salem, NC, January 31st, 2008.

“Phonons from First Principles: Density Functional Perturbation Theory”, D. A. Stewart, Defining the Interface of Nanoscience and Geology, 3rd Annual CNF Fall Workshop, Cornell University, November 13th, 2007.

“Building nanostructures on your computer: Atomic numbers, positions, and some assembly required”, (invited talk), D. A. Stewart, Prairie View A&M University, Prairie View, Texas, September 28th, 2007.

“Developing Tools for the Nanoscale World: Green’s Functions and Nanoscale Transport”, (invited talk), D. A. Stewart, Friedrich-Alexander University, Erlangen-Nuremberg, Germany, July 2nd, 2007.

“The role of intrinsic regions in nanotube photodiodes”, D. A. Stewart, APS March Meeting, Denver, CO March 5th, 2007.

“Coaxial Palladium Nanowires: Magnetism and Transport”, D. A. Stewart, Joint MMM/Intermag Conference, Baltimore, MD, 2007.

"NNIN Computation" (poster), Future of Nanotechnology Conference: CNF 30th Anniversary Event, 2007.

“Magnetism and Transport in Coaxial Palladium Nanowires”, (poster), Gordon Conference on Magnetic Nanostructures, Oxford, England, 2006.

“Nanotube Optoelectronics: Detecting light in the nanoscale world”, (invited talk), D. A. Stewart, Synergy between Experiment and Computation in Nanoscale Science, Harvard University, Boston, MA June 2, 2006.

"Lean, Mean, and Green!  Nanoscale Transport and Green's Functions", (invited talk), D. A. Stewart, Molecular Electronics Group Meeting, Cornell University, January, 13, 2006.

“Magnetism in Pd nanowires”, D. A. Stewart, MRS Fall Meeting, Boston, MA November 30, 2005.

“Muffin Tins, Green’s Functions, and more!”, D. A. Stewart, Modeling the Nanoscale World: 2005 Cornell Nanoscale Facility Fall Workshop, Cornell University, October 10, 2005.

“On the Magnetic Edge: Pd Nanowires”, D. A. Stewart, Psi-K 2005 Conference, Schwabish Gmund, Germany, September 21, 2005.

"Detecting Light with Nanotubes", (invited talk), D. A. Stewart, IRG-E working group, Cornell University, February 10th, 2005.

"High Performance Modeling through the NNIN", NNIN Computation Open House, APS March Meeting, Los Angeles, CA March 23rd, 2005.

“Modeling Electronic Transport in Nanoscale Devices”, D. A. Stewart, (invited talk), Cornell Nanoscale Facility, Cornell University, Ithaca, NY September 8, 2004.

"Detecting Light with Nanotubes”, (invited talk), D. A. Stewart, Stanford Research Institute (SRI), Palo Alto, CA, June 9, 2004.

“Detecting Light with Nanotubes”, (invited talk), D. A. Stewart, Lawrence Livermore National Laboratory, Livermore, CA, April 29, 2004.

“Nanotubes for Optoelectronics”, D. A. Stewart and F. Léonard, APS March Meeting, Montreal, Canada 2004.

“Photocurrents in Nanotube Junctions”, D. A. Stewart and F. Léonard, American Vacuum Society 50th International Symposium, 2003.

“Introduction to the Layered Korringa-Kohn-Rostoker (LKKR) Approach”, (invited talk), D. A. Stewart, Stanford University, September 2003.

“Photocurrents in Carbon Nanotube Devices”, D. A. Stewart and F. Léonard, APS March Meeting, Austin, TX 2003.

“Spin polarized tunneling in delta doped resonant tunneling devices”, D. A. Stewart and M. van Schilfgaarde, MRS Fall Meeting, 2002.

“Principal Layer Green Function Approach for Magnetic Tunneling”, D. A. Stewart and M. van Schilfgaarde, APS March Meeting, Indianapolis, Indiana, 2002.

"Modeling Interfaces in Magnetic Multilayers", (poster) D. A. Stewart, X. W. Zhou, X. G. Zhang, and W. H. Butler, APS March Meeting, 2002

“Interfacial Scattering and the Specularity Parameter”, D. A. Stewart, (invited talk), Sandia National Laboratories, Livermore, CA, June 28, 2001.

“Giant Magnetoresistance in Spin Valve Multilayers”, D. A. Stewart University of Virginia, Charlottesville, VA, April 5, 2001.

“Interfacial Scattering in Magnetic Multilayers”, D. A. Stewart, X.-G. Zhang and W. H. Butler, APS March Meeting, Seattle, WA 2001.

“Role of Surface Scattering and Impurities in Giant Magnetoresistance”, D. A. Stewart, X.-G. Zhang and W. H. Butler, Pan-American Studies Institute on Computational Materials Science, Summer School – Santiago, Chile 2001. Group Picture

“Size Effects on the Thermal Conductivity of Thin Metallic Wires” D. Stewart and P. M. Norris, Joint AIAA/ASME Thermophysics and Heat Transfer Conference, Albuquerque, NM 1998.

“Curvature of Spacetime”, D. A. Stewart and E. Lane, Regional meeting of the Tennessee Academy of Science, 1995. (received Best Presentation honors)

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Tutorial Presentations

Lean, Mean, and Green!  Nanoscale Transport and Green's Functions (Presentation to the Molecular Electronics Group Meeting, Cornell, January 13, 2006)

Muffin Tins, Green’s Functions, and more!  (Presentation given at the CNF Fall Workshop 2005)

Introduction to Layered KKR approach (Presentation originally given at Stanford University, September 2003)

Detecting Light with Nanotubes (Presentation to IRG-E working group, Cornell, February 10th, 2005)

High Performance Modeling through the NNIN (Presentation at NNIN Computation Open House, March 23rd, 2005, APS March Meeting)

Tutorials related to the Linear Muffin Tin Orbital approach

A very brief introduction to the PWscf package for density functional calculations that I put together for a tutorial session in a NNIN conference at Harvard in 2006.

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