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Selected Publications: 

($ corresponding author; * equally contributed author)

1. Observation of room temperature polar skyrmions

S. Das*$, Y. L. Tang*, Z. Hong*, M. A. P. Gonçalves*, M. R. McCarter, C. Klewe, K.X. Nyugen, F.   Gómez-Ortiz, P. Shafer, E. Arenholz, V. A. Stoica, S.-L. Hsu, B. Wang, C. Ophus, J. F. Liu, C. T. Nelson, S. Saremi, B. Prasad, A. B. Mei, D. G. Schlom, J. Íñiguez, P. García-Fernández, D.A. Muller, L. Q. Chen, J. Junquera, L. W. Martin and R. Ramesh$

Nature 568, 368-372 (2019)

DOI: https://doi.org/10.1038/s41586-019-1092-8

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2. Local negative permittivity and topological phase-transition in polar skyrmions

S. Das*$, Z. Hong*, V.A. Stoica*, M. A. P. Gonçalves*, Y.T. Shao, E. Parsonnet, E. J. Marksz, S. Saremi, M. R. McCarter, A. Reynoso, C. J Long, A. M. Hagerstrom, D. Meyers, V. Ravi, B. Prasad, H. Zhou, Z. Zhang, H. Wen, F. Gómez-Ortiz, P. García-Fernández, J. Bokor, J. Íñiguez, J.W. Freeland, N. D. Orloff, J. Junquera, L.Q. Chen, S. Salahuddin, D. A. Muller, L.W. Martin, R. Ramesh$

Nature Materials 20, 194-201 (2021)

DOI: https://doi.org/10.1038/s41563-020-00818-y

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3. Low voltage-driven high-performance thermal switching in antiferroelectric PbZrO3 thin films

Chenhan Liu, Yangyang Si, Hua Zhang, Chao Wu, Shiqing Deng, Yongqi Dong, Yijie Li, Meng Zhuo, Ningbo Fan, Bin Xu, Ping Lu, Lifa Zhang, Xi Lin, Xingjun Liu, Juekuan Yang, Zhenlin Luo, Sujit Das, Laurent Bellaiche, Yunfei Chen, Zuhuang Chen

Science 382, 1265-1269 (2023)

DOI: 10.1126/science.adj9669

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4. Emergent Chirality in a Polar Meron to Skyrmion Phase Transition

Yu-Tsun Shao, Sujit Das, Zijian Hong, Ruijuan Xu, Swathi Chandrika, Fernando Gómez- Ortiz, Pablo García-Fernández, Long-Qing Chen, Harold Y. Hwang, Javier Junquera, Lane W. Martin, Ramamoorthy Ramesh & David A. Muller

Nature Communications 14, 1355 (2023)

DOI: https://doi.org/10.1038/s41467-023-36950-x

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5. Optical Creation of an Oxide Supercrystal with Three-Dimensional Nanoscale Periodicity

V.A. Stoica, N. Laanait, C. Dai, Z. Hong, Y. Yuan, Z. Zhang, S. Lei, M.R. McCarter, A. Yadav, A. R. Damodaran, S. Das, G.A. Stone, J. Karapetrova, D.A. Walko, X. Zhang, L. W. Martin, R. Ramesh, L.-Q. Chen, H. Wen, V. Gopalan, and J.W. Freeland

Nature Materials 18, 377-383 (2019)

DOI: https://doi.org/10.1038/s41563-019-0311-x

Cover article

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6. Observation of Spatially Resolved Steady State Negative Capacitance

Ajay K. Yadav, Kayla X. Nguyen, Zijian Hong, Pablo García-Fernández, Pablo Aguado-Puente, Christopher T. Nelson, Sujit Das, Bhagwati Prasad, Daewoong Kwon, Suraj Cheema, Asif I. Khan, Jorge Íñiguez, Javier Junquera, Long-Qing Chen, David A. Muller, Ramamoorthy Ramesh, Sayeef Salahuddin

Nature 565, 468-471 (2019)

DOI: https://doi.org/10.1038/s41586-018-0855-y

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7. Low-field switching of non-collinear spin textures at La0.7Sr0.3MnO3-SrRuO3 interfaces  

S. Das$, A.D. Rata, I.V. Maznichenko, S. Agrestini, E. Pippel, K. Chen, E. Pellegrin, S. M. Valvidares, H. B. Vasili, J. Herrero-Martin, K. Nenkov, A. Herklotz, A. Ernst, I. Mertig, Z. Hu, and K. Dörr$

Phys. Rev. B 99, 024416 (2019)

DOI: https://doi.org/10.1103/PhysRevB.99.024416

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8. Electric field manipulation of spins in doped PbTiO3

Junjie Liu, Valentin V. Laguta, Katherine Inzani, Weichuan Huang, Sujit Das, Ruchira Chatterjee, Evan Sheridan, Sinéad M. Griffin, Arzhang Ardavan, and Ramamoorthy Ramesh

Science Advances 7, eabf8103 (2021)

DOI:  10.1126/sciadv.abf8103

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9. Inherent spin–polarization coupling in a magnetoelectric vortex

Sujit Das,*$ Valentyn Laguta,* Katherine Inzani,* Weichuan Huang, Junjie Liu, Ruchira Chatterjee, Margaret R. McCarter, Sandhya Susarla, Arzhang Ardavan, Javier Junquera, Sinéad M. Griffin, and Ramamoorthy Ramesh

Nano Letters 10, 3976-3982 (2022)

DOI: 10.1021/acs.nanolett.2c00496

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10. Subterahertz collective dynamics of polar vortices

Qian Li*, Vladimir Stoica*, Marek Pasciak, Yi Zhu, Yakun Yuan, Tiannan Yang, Margaret R. McCarter, Sujit Das, Ajay K. Yadav, Suji Park, Cheng Dai, Hyeon Jun Lee, Youngjun Ahn, Samuel D. Marks, Takahiro Sato, Matthias C. Hoffmann, Matthieu Chollet, Michael E. Kozina, Silke Nelson, Diling Zhu, Donald A. Walko, Aaron M. Lindenberg, Paul G. Evans, Long-Qing Chen, R. Ramesh, Lane W. Martin, Venkatraman Gopalan, John W. Freeland, Jirka Hlinka, Haidan Wen

Nature 592, 376-380 (2021)

DOI: https://doi.org/10.1038/s41586-021-03342-4

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11. Atomic scale crystal field mapping of the polar vortices in oxide superlattices

Sandhya Susarla, Colin Ophus, Pablo Garcia Fernandez, Sujit Das, Peter Ercius, Lane W. Martin, Ramamoorthy Ramesh and Javier Junquera.

Nature Communications 12, 6273 (2021)

DOI: https://doi.org/10.1038/s41467-021-26476-5

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12. Vortex Domain Walls in Ferroelectrics

Z. Hong*, S. Das*, C. T. Nelson*, A. Yadav, Y. Wu, J. Junquera, L.-Q. Chen, L. W. Martin, R. Ramesh

Nano Letters 21, 3533-3539 (2021)

DOI: https://doi.org/10.1021/acs.nanolett.1c00404

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13. Structural Chirality of Polar Skyrmions Probed by Resonant Elastic X-ray Scattering

 Margaret R. McCarter,∗ Kook Tae Kim, ∗ Vladimir A. Stoica, Sujit Das, Christoph Klewe, Elizabeth P. Donoway, David M. Burn, Padraic Shafer, Fanny Rodolakis, Mauro A. P. Gonalves, Fernando G ́omez-Ortiz, Jorge Iniguez, Pablo Garcia-Fernandez, Javier Junquera, Stephen W. Lovesey, Gerrit van der Laan, Se Young Park, John W. Freeland, Lane W. Martin, Dong Ryeol Lee,$ and Ramamoorthy Ramesh$

Physical Review Lett. 129, 247601 (2022)

DOI: https://doi.org/10.1103/PhysRevLett.129.247601

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14. Study of disorder in pulsed laser deposited double perovskite oxides by first-principle structure prediction

Edoardo Fertitta, Sujit Das, Debalina Banerjee, Farbod Ebrahimi, Clément Barraud, Kai Du, He Tian,  Chris J. Pickard,  Cedric Weber, Ramamoorthy Ramesh, Peter Littlewood, and David Dubbink

npj computational materials 7, 1-8 (2021)

DOI: https://doi.org/10.1038/s41524-021-00561-1

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15. Epitaxial ferroelectric with metallic pyrochlore oxide electrodes

Z. Zhang, S.-L. Hsu, V. Stoica, H. Paik, J. Wang, L. Xie, M. Kumari, S. Das, Z. Leng, E.Parsonnet, A. Qualls, M. McBriarty, R. Proksch, A. Gruverman, D. G. Schlom, L.Q. Chen, S. Salahuddin, L. W. Martin, R. Ramesh

Advanced Materials 33, 2006089 (2021)

DOI: https://doi.org/10.1002/adma.202006089

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16. Erbium-Implanted Materials for Quantum Communication Applications

Paul Stevenson, Christopher M Phenicie, Isaiah Gray, Sebastian P Horvath, Sacha Welinski, Austin M Ferrenti, Alban Ferrier, Philippe Goldner, Sujit Das, Ramamoorthy Ramesh, Robert J Cava, Nathalie P de Leon, and Jeff D Thompson

Physical Rev. B 105, 224116 (2022)

DOI: https://doi.org/10.1103/PhysRevB.105.224106

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17. Strain dependence of the antiferromagnetic interface coupling in La0.7Sr0.3MnO3/SrRuO3    superlattice

Sujit Das$, Andreas Herklotz, Eckhard Pippel, Er-Jia Guo, Diana Rata and Kathrin Dörr$

Phys. Rev. B 91, 134405 (2015) 

DOI: https://doi.org/10.1103/PhysRevB.91.134405

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18. The role of lattice dynamics in ferroelectric switching

Qiwu Shi, Eric Parsonnet, Xiaoxing Chen, Ren-Ci Peng, Abel Fernandez, Natalya Fedorova, Alexander Qualls, Xiaoxi Huang, Xue Chang, Hongrui Zhang, David Pesquera, Sujit Das, Dmitri Nikonov, Ian Young, Long-Qing Chen, Lane Martin, Yen-Lin Huang, Jorge Íñiguez, Ramamoorthy Ramesh

Nature Communications 13, 1110 (2022)

DOI: https://doi.org/10.1038/s41467-022-28622-z

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19. Room-temperature ferromagnetism at an oxide/nitride interface

Qiao Jin,  Zhiwen Wang, Qinghua Zhang, Yonghong Yu,  Shan Lin,  Shengru Chen,  Mingqun Qi,  He Bai, Amanda Huon,  Qian Li,  Le Wang,  Xinmao Yin,  Chi Sin Tang,  Andrew T. S. Wee,  Fanqi Meng, Jiali Zhao, Jia-Ou Wang,  Haizhong Guo,  Chen Ge,  Can Wang,  Wensheng Yan,  Tao Zhu,  Lin Gu,  Scott A. Chambers, Sujit Das, Timothy Charlton,  Michael R. Fitzsimmons,  Gang-Qin Liu,  Shanmin Wang, Kui-juan Jin, Hongxin Yang,  and Er-Jia Guo

Physical Review Lett. 128, 017202 (2022)

DOI: https://doi.org/10.1103/PhysRevLett.128.017202

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20. Structural and Magnetic Properties of La0.7Sr0.3MnO3/LaCoO3 Heterostructures

S. Thota, K. Roychowdhury, V. Thakre, S. C. Ganguly, Z.H. Chen$, E J. Guo$, and S. Das$

Appl. Phys. Lett. 113, 122405 (2018)

DOI: https://doi.org/10.1063/1.5045359

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21. Hexagonal close-packed polar-skyrmion lattice in ultrathin ferroelectric PbTiO3 films

Shuai Yuan, Zuhuang Chen, Sergei Prokhorenko, Yousra Nahas, Laurent Bellaiche, Chenhan Liu, Bin Xu, Lang Chen, Sujit Das, and Lane W. Martin

Physical Review Letters 130, 226801 (2023)

DOI: 10.1103/PhysRevLett.130.226801

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22. Pure Chiral Polar Vortex Phase in PbTiO3/SrTiO3 Superlattices with Tunable Circular Dichroism

Sujit Das,* Margaret R. McCarter, Fernando G.mez-Ortiz, Yun-Long Tang, Zijian Hong, Anirban Ghosh, Padraic Shafer, Pablo Garc.a-Fern.ndez, Javier Junquera, Lane W. Martin, and Ramamoorthy Ramesh

Nano Letters (2023)

DOI: https://doi.org/10.1021/acs.nanolett.3c01744

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