My research aims to explore dynamics of non-equilibrium processes occurring in materials following photo- and/or electrical-excitation. Understanding such dynamic processes is critical to achieve high efficiency in photovoltaics, lasers and photocatalysis. To this end, I study emerging soft and hard condensed matter systems including colloidal nanocrystals, two-dimensional materials, halide perovskites and ferroelectric oxides by using ultrafast techniques with probes ranging from terahertz waves to free-electron X-ray lasers to unravel fundamental processes governing energy conversion, flow and localization.

Selected publications on ultrafast structural studies:

B. Guzelturk, T. Winkler, T. Van de Goor, M. D. Smith, S. A. Bourelle, S. Feldmann, M. Trigo, S. Teitelbaum, H-G. Steinrück, G. A. de la Pena, R. Alonso-Mori, D. Zhu, T. Sato, H. I. Karunadasa, M. F. Toney, F. Deschler, A. M. Lindenberg,

Visualization of Dynamic Polaronic Strain Fields in Hybrid Lead Halide Perovskites

Nature Materials 20, 618 (2021)

B. Guzelturk, B. L. Cotts, D. Jasrasaria, J. P. Philbin, D. A. Hanifi, B. A. Koscher, A. D. Balan, E. Curling, M. Zajac, S. Park, N. Yazdani, C. Nyby, V. Kamysbayev, S. Fischer, Z. Nett, X. Shen, M. E. Kozina, M.-F. Lin, A. H. Reid, S. P. Weathersby, R. D. Schaller, V. Wood, X. Wang, J. A. Dionne, D. V. Talapin, A. P. Alivisatos, A. Salleo, E. Rabani, A. M. Lindenberg,

Dynamic lattice distortions driven by surface trapping in semiconductor nanocrystals

Nature Communications 12, 1860 (2021)

B. Guzelturk, J. K. Utterback, I. Coropceanu, V. Kamysbayev, E. M. Janke, M. Zajac, N. Yazdani, B. L. Cotts, S. Park, A. Sood, M.-F. Lin, A. H. Reid, M. E. Kozina, X. Shen, S. P Weathersby, V. Wood, A. Salleo, X. Wang, D. V. Talapin, N. S. Ginsberg, A. M. Lindenberg,

Nonequilibrium Thermodynamics of Colloidal Gold Nanocrystals Monitored by Ultrafast Electron Diffraction and Optical Scattering Microscopy

ACS Nano 14, 4792 (2020)

Selected publications on THz emission:

B. Guzelturk, A. B. Mei, L. Zhang, L. Z. Tan, P. Donahue, A. G. Singh, D. G. Schlom, L. W. Martin, A. M. Lindenberg,

Light-Induced Currents at Domain Walls in Multiferroic BiFeO3

Nano Lett. 20, 145 - 151 (2020)

E. Y. Ma*, B. Guzelturk*, G. Li, L. Cao, Z.-X. Shen, A. M. Lindenberg, T. F. Heinz,

Recording Interfacial Currents on the Sub-Nanometer Length and Femtosecond Time Scale by Terahertz Emission

Science Advances 5, eaau0073 (2019)

B. Guzelturk, R. A. Belisle, M. D. Smith, K. Bruening, R. Prasanna, Y. Yuan, V. Gopalan, C. J. Tassone, H. I. Karunadasa, M. D. McGehee, A. M. Lindenberg,

Terahertz Emission from Hybrid Perovskites Driven by Ultrafast Charge Separation and Strong Electron-Phonon Coupling

Advanced Materials 30, 1704737 (2018)

Selected publications on colloidal nanocrystal optoelectronics:

B. Guzelturk, M. Pelton, M. Olutas, H. V. Demir,

Giant Modal Gain Coefficients in II-VI Nanoplatelets

Nano Lett. 19, 277-282 (2019)

B. Guzelturk, H. V. Demir,

Near-Field Energy Transfer Using Nanoemitters For Optoelectronics

Advanced Functional Materials 26, 8158 – 8177 (2016)

B. Guzelturk, Y. Kelestemur, K. Gungor, A. Yeltik, M. Z. Akgul, W. Yue, R. Chen, H. D. Sun, C. Dang, H. V. Demir,

Stable and Low Threshold Optical Gain in CdSe/CdS Quantum Dots: All-Colloidal Frequency Up-Converted Laser

Advanced Materials 27, 2741 (2015)

M. Olutas*, B. Guzelturk*, Y. Kelestemur, A. Yeltik, S. Delikanli, H. V. Demir,

Lateral Size-Dependent Spontaneous and Stimulated Emission Properties in Colloidal CdSe Nanoplatelets

ACS Nano 9, 5041 (2015)

B. Guzelturk, O. Erdem, M. Olutas, Y. Kelestemur, H. V. Demir,

Stacking in Colloidal Nanoplatelets: Excitonic Properties

ACS Nano 8, 12524 (2014)

B. Guzelturk, Y. Kelestemur, M. Olutas, S. Delikanli, H. V. Demir

Amplified Spontaneous Emission and Lasing in Colloidal Nanoplatelets

ACS Nano 8, 6599 (2014)

A. Yeltik*, B. Guzelturk*, P. L. H. Martinez, A. O. Govorov, H. V. Demir,

Phonon Assisted Nonradiative Energy Transfer into Silicon From Colloidal Quantum Dots

ACS Nano 7, 10492 (2013