Publications
Papers
40. Z.-J. Cheng, S. Shao, B. Kim, T. A. Cochran, X. P. Yang, C. Yi, Y.-X. Jiang, J. Zhang, M. S. Hossain, S. Roychowdhury, et al. Untangling charge-order dependent bulk states from surface effects in a topological kagome metal ScV6Sn6, Phys. Rev. B, 2024, 109, 075150.
39. C. Yi, X. Feng, N. Mao, P. Yanda, S. Roychowdhury, Y. Zhang, C. Felser,C. Shekhar, Quantum oscillations revealing topological band in kagome metal ScV6Sn6, Phys. Rev. B, 2024, 109, 035124.
38. S. Roychowdhury*, K. Samanta, P. Yanda, B. Malaman, M. Yao, W. Schnelle, E. Guilmeau, P. Constantinou, S. Chandra, H. Borrmann, M. Vergniory, V. Strocov, C. Shekhar, C. Felser, Interplay between magnetism and topology: Large topological Hall effect in an antiferromagnetic topological insulator, EuCuAs, J. Am. Chem. Soc., 2023, 145, 12920.
37. A. Korshunov, H. Hu, D. Subires, Y. Jiang, D. Calugaru, X. Feng, A. Rajapitamahuni, C. Yi, S. Roychowdhury, et al. Softening of a flat phonon mode in the kagome ScV6Sn6. Nat. Commun. 2023, 14, 6646.
36. V. Rajaji, R. Arora, B. Joseph, S. Roychowdhury, U. V. Waghmare, K. Biswas, C. Narayana, Pressure-induced topological crystalline insulating phase in TlBiSe2: Experiments and theory, Phys. Rev. B, 2023, 107, 205139.
35. I. Maria, R. Arora, M. Dutta, S. Roychowdhury, U. V. Waghmare, K. Biswas, Metavalent Bonding-Mediated Dual 6s2 Lone Pair Expression Leads to Intrinsic Lattice Shearing in n-Type TlBiSe2. J. Am. Chem. Soc., 2023, 145, 9292.
34. S. Roychowdhury*, M. Yao, K. Samanta, S. Bae, D. Chen, S. Ju, A. Raghavan, N. Kumar, P. Constantinou, S. N. Guin, N. C. Plumb, M. Romanelli, H. Borrmann, M. G. Vergniory, V. N. Strocov, V. Madhavan, C. Shekhar, C. Felser, Anomalous Hall conductivity and Nernst effect of the ideal Weyl semimetallic ferromagnet EuCd2As2, Adv. Sci., 2023, 10, 2207121.
33. S. Roychowdhury*, A. M. Ochs, S. N. Guin, K Samanta, J Noky, C. Shekhar, M. G. Vergniory, J. E. Goldberger, C. Felser, Large room temperature anomalous transverse thermoelectric effect in Kagome antiferromagnet YMn6Sn6. Adv. Mater., 2022, 34, 2201350.
32. S. Singh, N. Kumar, S. Roychowdhury, C. Shekhar, C. Felser, Anisotropic large diamagnetism in Dirac semimetals ZrTe5 and HfTe5, J. Condens. Matter Phys., 2022, 34, 225802.
31. E. Rathore, R. Juneja, D. Sarkar, S. Roychowdhury, M. Kofu, K. Nakajima, A. K. Singh, K. Biswas, Enhanced covalency and nanostructured phonon scattering lead to high thermoelectric performance in n-type PbS, Mater. Today Energy, 2022, 24, 100953.
30. A. Bhui, S. Roychowdhury, A. Sen, U. V Waghmare, K. Biswas, Free‐standing few‐layer tellurene nanosheets: simple solution‐phase synthesis and electronic structure, Z. Anorg. Allg. Chem., 2022, e202200097.
29. S. Roychowdhury, T. Ghosh, R. Arora, M. Samanta, L. Xie, N. K. Singh, A. Soni, J. He, U. V. Waghmare, K. Biswas, Enhanced atomic ordering leads to high thermoelectric performance in AgSbTe2, Science, 2021, 371, 722.
28. S. Roychowdhury*, S. Singh, S. N. Guin, N. Kumar, T. Chakraborty, W. Schnelle, H. Borrmann, C. Shekhar, C. Felser, Giant topological hall effect in the noncollinear phase of two-dimensional antiferromagnetic topological insulator MnBi4Te7, Chem. Mater., 2021, 33, 8343.
27. T. Ghosh, S. Roychowdhury, M. Dutta, K. Biswas, High-performance thermoelectric energy conversion: A tale of atomic ordering in AgSbTe2, ACS Energy Lett., 2021, 6, 2825.
26. D. Sarkar, S. Roychowdhury, R. Arora, T. Ghosh, A. Vasdev, B. Joseph, G. Sheet, U. V. Waghmare, K. Biswas, Metavalent bonding in gese leads to high thermoelectric performance, Angew. Chem. Int. Ed., 2021, 60, 10350.
25. P. Acharyya, S. Roychowdhury, M. Samanta, K. Biswas, Ultralow thermal conductivity, enhanced mechanical stability, and high thermoelectric performance in (GeTe)1–2x(SnSe)x(SnS)x, J. Am. Chem. Soc., 2020, 142, 20502.
24. D. Sarkar, T. Ghosh, S. Roychowdhury, R. Arora, S. Sajan, G. Sheet, U. V. Waghmare, K. Biswas, Ferroelectric instability induced ultralow thermal conductivity and high thermoelectric performance in rhombohedral p-type GeSe crystal, J. Am. Chem. Soc., 2020, 142, 12237.
23. S. Roychowdhury, R. K. Biswas, M. Dutta, S. K. Pati, K. Biswas, Phonon localization and entropy-driven point defects lead to ultralow thermal conductivity and enhanced thermoelectric performance in (SnTe)1−2x(SnSe)x(SnS)x, ACS Energy Lett., 2019, 4, 1658.
22. D. Sarkar, T. Ghosh, A. Banik, S. Roychowdhury, D. Sanyal, K. Biswas, Highly converged valence bands and ultralow lattice thermal conductivity for high‐performance SnTe thermoelectrics, Angew. Chem. Int. Ed., 2020, 59, 11115.
21. S. Pal, R. Arora, S. Roychowdhury, L. Harnagea, K. Saurabh, S. Shenoy, DVS Muthu, K. Biswas, U. V. Waghmare, A. K. Sood, Pressure-induced phase transitions in the topological crystalline insulator SnTe and its comparison with semiconducting SnSe: Raman and first-principles studies, Phys. Rev. B, 2020, 101, 155202.
20. R. Attri, S. Roychowdhury, K. Biswas, C.N.R. Rao, Low thermal conductivity of 2D borocarbonitride nanosheets, J. Solid State Chem.,2020, 282, 121105.
19. S. Roychowdhury, K. Biswas, Effect of In and Cd co-doping on the thermoelectric properties of Sn1−xPbxTe, Mater. Res. Express, 2019, 6, 104010.
18. S. Roychowdhury, M. Samanta, A. Banik, K. Biswas, Thermoelectric energy conversion and topological materials based on heavy metal chalcogenides, J. Solid State Chem.,2019, 275, 103.
17. S. Roychowdhury, M. Dutta, K. Biswas, Enhanced thermoelectric performance in topological crystalline insulator n-type Pb0.6Sn0.4Te by simultaneous tuning of the band gap and chemical potential, J. Mater. Chem. A, 2018, 6, 24216.
16. S. Roychowdhury, T. Ghosh, R. Arora, U. V. Waghmare, K. Biswas, Stabilizing n‐type cubic GeSe by entropy‐driven alloying of AgBiSe2: Ultralow thermal conductivity and promising thermoelectric performance, Angew. Chem. Int. Ed., 2018, 130, 15387.
15. S. Roychowdhury, M. K. Jana, J. Pan, S. N. Guin, D. Sanyal, U. V. Waghmare, K. Biswas, Soft phonon modes leading to ultralow thermal conductivity and high thermoelectric performance in AgCuTe, Angew. Chem. Int. Ed., 2018, 57, 4043.
14. S. Roychowdhury, M. Samanta, S. Perumal, K. Biswas, Germanium chalcogenide thermoelectrics: Electronic structure modulation and low lattice thermal conductivity, Chem. Mater., 2018, 30, 5799.
13. S. Roychowdhury, K. Biswas, Slight symmetry reduction in thermoelectrics, Chem, 2018, 4, 939.
12. A. Banik, S. Roychowdhury, K. Biswas, The journey of tin chalcogenides towards high- performance thermoelectrics and topological materials, Chem. Commun., 2018, 54, 6573.
11. M. Samanta, S. Roychowdhury, J. Ghatak, S. Perumal, K. Biswas, Ultrahigh average thermoelectric figure of merit, low lattice thermal conductivity and enhanced microhardness in nanostructured (GeTe)x(AgSbSe2)100−x, Chem. Eur. J., 2017, 23, 7438.
10. S. Roychowdhury, R. Panigrahi, S. Perumal, K. Biswas, Ultrahigh thermoelectric figure of merit and enhanced mechanical stability of p-type AgSb1-xZnxTe2, ACS Energy Lett., 2017, 2, 349.
9. S. Roychowdhury, U. S. Shenoy, U. V. Waghmare, K. Biswas, An enhanced Seebeck coefficient and high thermoelectric performance in p-type In and Mg co-doped Sn1-xPbxTe via co-adjuvant effect of resonance level and heavy hole valence band, J. Mater. Chem. C, 2017, 5, 5737.
8. S. Das, L. Aggarwal, S. Roychowdhury, M. Aslam, S. Gayen, K. Biswas, G. Sheet, Unexpected superconductivity at nanoscale junctions made on the topological crystalline insulator Pb0.6Sn0.4Te, Appl. Phys. Lett., 2016, 13, 132601.
7. S. Roychowdhury, U. S. Shenoy, U. V. Waghmare, K. Biswas, Effect of potassium doping on electronic structure and thermoelectric properties of topological crystalline insulator, Appl. Phys. Lett., 2016, 108, 193901.
6. S. Roychowdhury, S. Ghara, S. N. Guin, A. Sundaresan, K. Biswas, Large linear magnetoresistance in topological crystalline insulator Pb0.6Sn0.4Te, J. Solid State Chem., 2016, 233, 199.
5. S. Perumal,# S. Roychowdhury,# K. Biswas, High performance thermoelectric materials and devices based on GeTe, J. Mater. Chem. C, 2016, 4, 7520. (# Equal contribution)
4. S. Perumal,# S. Roychowdhury,# K. Biswas, Reduction of thermal conductivity through nanostructuring enhances the thermoelectric figure of merit in Ge1-xBixTe, Inorg. Chem. Front., 2016, 3, 125. (# Equal contribution)
3. S. Roychowdhury, U. S. Shenoy, U. V. Waghmare, K. Biswas, Tailoring of electronic structure and thermoelectric properties of topological crystalline insulator by chemical doping, Angew. Chem. Int. Ed., 2015, 54, 15241.
2. S. Perumal, S. Roychowdhury, D. S. Negi, R. Datta, K. Biswas, High thermoelectric performance and enhanced mechanical stability of p-type Ge1-xSbxTe, Chem. Mater., 2015, 27, 7171.
1. S. Ghosh J. Kuchlyan, S. Roychowdhury, D. Banik, N. Kundu, A. Roy, N. Sarkar, Unique influence of cholesterol on modifying the aggregation behavior of surfactant assemblies: investigation of photophysical and dynamical properties of 2,2'-bipyridine-3,3'-diol in surfactant micelles, and surfactant/cholesterol forming vesicles, J. Phys. Chem. B, 2014, 118, 9329.
Book Chapters
A. Dan, B. Basu, S. Roychowdhury, K. Biswas, B. Raj, “Nanotechnology and energy conversion: A solution using spectrally selective solar absorbers and thermoelectrics” in the book “Nanoscience and Nanotechnology: Advances and Developments in Nano-sized Materials”, Ed. M. V. de Voorde, Walter de Gruyter GmbH & Co KG, 2018.
Patent
K. Biswas, S. Roychowdhury, T. Ghosh, A p-type material, and implementations thereof. 2022, US Patent App. 17/626,953.