Vankatraman Gopalan's research focuses on the science and technology of nonlinear optical materials. The work straddles materials science, physics, and optical engineering. There are three current areas of focus: complex oxides, semiconductor fibers and metalattices, and symmetry. Technology impacted by Gopalan's research includes:
- Multiferroics enable electrical control of magnetic devices, and vice versa, and dual electrical-magnetic storage media
- Nonlinear optical devices are targeted for optical communications and infrared applications
- The vision of hybrid semiconductor-metal-silica structures is all-fiber optoelectronics, where light generation, modulation and detection can be performed within a fiber
In the News
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Recent Publications
Discovery of a layered multiferroic compound Cu1−xMn1+ySiTe3 with strong magnetoelectric coupling
De, C., Liu, Y., Ayyagari, S. V. G., Zheng, B., Kelley, K. P., Hazra, S., He, J., Pawledzio, S., Mali, S., Guchhait, S., Yoshida, S., Guan, Y., Lee, S. H., Sretenovic, M., Ke, X., Wang, L., Engelhard, M. H., Du, Y., Xie, W. & Wang, X. & 5 others, , Jan 3 2025, In: Science Advances. 11, 1, eadp9379.Research output: Contribution to journal › Article › peer-review
Interplay between Two Structure Types in the Incommensurately Modulated A14+2/3Ta8Se46+2/3 Compounds (A = Rb, Cs)
Ie, T. S., Balvanz, A., Malliakas, C. D., Nag, J., Sarker, S., Marmer, A., Gopalan, V. & Kanatzidis, M. G., Feb 10 2025, In: Inorganic chemistry. 64, 5, p. 2403-2414 12 p.Research output: Contribution to journal › Article › peer-review
Realization of Non-Equilibrium Wurtzite Structure in Heterovalent Ternary MgSiN2 Film Grown by Reactive Sputtering
Kageyama, S., Okamoto, K., Yasuoka, S., Ide, K., Hanzawa, K., Hiranaga, Y., Hsieh, P., Harza, S., Suceava, A., Saha, A., Yokota, H., Shigematsu, K., Azuma, M., Gopalan, V., Uchida, H., Hiramatsu, H. & Funakubo, H., 2025, (Accepted/In press) In: Advanced Electronic Materials.Research output: Contribution to journal › Article › peer-review
Hidden domain boundary dynamics toward crystalline perfection
Mangu, A., Stoica, V. A., Zheng, H., Yang, T., Zhang, M., Wang, H., Zu, R., Nguyen, Q. L., Song, S., Das, S., Meisenheimer, P., Donoway, E., Chollet, M., Sun, Y., Turner, J. J., Freeland, J. W., Wen, H., Martin, L. W., Chen, L. Q. & Gopalan, V. & 3 others, , Jan 14 2025, In: Proceedings of the National Academy of Sciences of the United States of America. 122, 2, e2407772122.Research output: Contribution to journal › Article › peer-review
Peculiar Magnetic and Magneto-Transport Properties in a Noncentrosymmetric Self-Intercalated van der Waals Ferromagnet Cr5Te8
Rai, B., Kuila, S. K., Saha, R., Hazra, S., De, C., Sau, J., Gopalan, V., Jana, P. P., Parkin, S. S. P. & Kumar, N., Jan 28 2025, In: Chemistry of Materials. 37, 2, p. 746-755 10 p.Research output: Contribution to journal › Article › peer-review
Thermodynamic theory of linear optical and electro-optical properties of ferroelectrics
Ross, A., Ali, M. S. M. M., Saha, A., Zu, R., Gopalan, V., Dabo, I. & Chen, L. Q., Feb 15 2025, In: Physical Review B. 111, 8, 085109.Research output: Contribution to journal › Article › peer-review
Observations on Macroscopic Surface Modification and Oxidation of Tungsten and Tungsten Carbide in Laser Focus in Air
Seo, M., Yu, S., Gopalan, V. & Winfrey, A. L., 2025, In: Fusion Science and Technology. 81, 2, p. 118-131 14 p.Research output: Contribution to journal › Article › peer-review
Large enhancement of ferroelectric properties of perovskite oxides via nitrogen incorporation
Wang, T., Gong, F., Ma, X., Pan, S., Wei, X. K., Kuo, C., Yoshida, S., Ku, Y. C., Wang, S., Yang, Z., Hazra, S., Zhang, K. H. L., Liu, X., Tang, Y., Zhu, Y. L., Chang, C. F., Das, S., Ma, X., Chen, L. & Xu, B. & 4 others, , Jan 10 2025, In: Science Advances. 11, 2, eads8830.Research output: Contribution to journal › Article › peer-review
Untangling individual cation roles in rock salt high-entropy oxides
Almishal, S. S. I., Sivak, J. T., Kotsonis, G. N., Tan, Y., Furst, M., Srikanth, D., Crespi, V. H., Gopalan, V., Heron, J. T., Chen, L. Q., Rost, C. M., Sinnott, S. B. & Maria, J. P., Oct 15 2024, In: Acta Materialia. 279, 120289.Research output: Contribution to journal › Article › peer-review
Perspectives and progress on wurtzite ferroelectrics: Synthesis, characterization, theory, and device applications
Casamento, J., Baksa, S. M., Behrendt, D., Calderon, S., Goodling, D., Hayden, J., He, F., Jacques, L., Lee, S. H., Smith, W., Suceava, A., Tran, Q., Zheng, X., Zu, R., Beechem, T., Dabo, I., Dickey, E. C., Esteves, G., Gopalan, V. & Henry, M. D. & 9 others, , Feb 19 2024, In: Applied Physics Letters. 124, 8, 080501.Research output: Contribution to journal › Short survey › peer-review
Light-induced transitions of polar state and domain morphology of photoferroelectric nanoparticles
Eliseev, E. A., Morozovska, A. N., Vysochanskii, Y. M., Yurchenko, L. P., Gopalan, V. & Chen, L. Q., Jan 15 2024, In: Physical Review B. 109, 4, 045434.Research output: Contribution to journal › Article › peer-review
Symmetry classification and enumeration of square-tile sikku kolams
Gopalan, V., 2024, In: Journal of Mathematics and the Arts. 18, 3-4, p. 244-257 14 p.Research output: Contribution to journal › Article › peer-review
Colossal Strain Tuning of Ferroelectric Transitions in KNbO3 Thin Films
Hazra, S., Schwaigert, T., Ross, A., Lu, H., Saha, U., Trinquet, V., Akkopru-Akgun, B., Gregory, B. Z., Mangu, A., Sarker, S., Kuznetsova, T., Sarker, S., Li, X., Barone, M. R., Xu, X., Freeland, J. W., Engel-Herbert, R., Lindenberg, A. M., Singer, A. & Trolier-McKinstry, S. & 8 others, , Dec 27 2024, In: Advanced Materials. 36, 52, 2408664.Research output: Contribution to journal › Article › peer-review
High-entropy engineering of the crystal and electronic structures in a Dirac material
Laha, A., Yoshida, S., Marques dos Santos Vieira, F., Yi, H., Lee, S. H., Ayyagari, S. V. G., Guan, Y., Min, L., Gonzalez Jimenez, J., Miao, L., Graf, D., Sarker, S., Xie, W., Alem, N., Gopalan, V., Chang, C. Z., Dabo, I. & Mao, Z., Dec 2024, In: Nature communications. 15, 1, 3532.Research output: Contribution to journal › Article › peer-review
Structural frustration effects by mixed alkali ions in ferroelectric Dion–Jacobson layered perovskites (Cs,Rb)NdNb2O7
Lu, Z. T., Asaki, S., Yoshida, S., Moriyoshi, C., Hasegawa, G., Fujita, K., Gopalan, V., Hayashi, K. & Akamatsu, H., Nov 25 2024, In: Journal of Materials Chemistry C. 13, 4, p. 1812-1823 12 p.Research output: Contribution to journal › Article › peer-review