Ohio State is in the process of revising websites and program materials to accurately reflect compliance with the law. While this work occurs, language referencing protected class status or other activities prohibited by Ohio Senate Bill 1 may still appear in some places. However, all programs and activities are being administered in compliance with federal and state law.

Quantum Matter Seminar- Salvador Barraza-Lopez (University of Arkansas)- Ferroelectricity, magnetoelasticity, structural phase transformations, topology, and non-linear optics of 2D materials

Outside of the PRB with sun shining and students walking past.
November 4, 2024
10:00 am - 11:30 am
1080 Physics Research Building

Professor Salvador Barraza-Lopez

University of Arkansas

Ferroelectricity, magnetoelasticity, structural phase transformations, topology, and non-linear optics of 2D materials

Location: 1080 Physics Research Building

Faculty Host: Jeanie Lau

 

Abstract: Experimentally verified structural transformations driven by temperature and electric fields are being used to control the physical properties of two-dimensional materials. In this presentation, I will highlight original contributions to the understanding of ferroelectric-paraelectric phase transformations on a family of 2D materials in which the valley degree of freedom is coupled to the direction of ferroelectric polarization [1,2] and will also present contributions to the understanding of magnetoelastic 2D transformations on a novel 2D magnet [3]. In the reminder of the talk, I will discuss two recent models where topology plays a role on materials’ behavior: I will revisit Liang Fu’s original model of a topological crystalline insulator (TCI) to argue for a 2D TCI [4] and will discuss the winding of the Berry curvature dipole on graphene moirés [5]. Time permitting, I will touch upon non-linear optical behavior of TMDCs under biaxial strain [6], and on the effect of atomistic reconstruction on the non-linear optical properties of hexagonal boron nitride moirés [7].

References:

[1] S. Barraza-Lopez, B. M. Fregoso, J. W. Villanova, S. S. P. Parkin, and K. Chang. Rev. Mod. Phys. 93, 011001 (2021)

[2] K Chang, F Küster, B. J. Miller, J.-R. Ji, J. L. Zhang, P. Sessi, S. Barraza-Lopez, and S. P. P. Parkin. Nano Lett. 20, 6590 (2020)

[3] Z. He, S. P. Poudel, S. Stolz, T. Wang, A. Rossi, F. Wang, S.-K. Mo, A. Weber-Bargioni, Z. Qiu, S. Barraza-Lopez, T. Zhu, and M. F. Crommie. Nano Lett. 24, 8535 (2024)

[4] S Barraza-Lopez and GG Naumis. J. Phys.: Condens. Matter 35, 035502 (2023)

[5] A. Huaman and S. Barraza-Lopez (under review)

[6] S. Puri, S. Patel, J. L. Cabellos, L. E. Rosas-Hernandez, B. Reynolds, H. Churchill, S. Barraza-Lopez, B. Mendoza, and H. Nakamura. Nano Lett. 24, 13061 (2024)

[7] L. E. Rosas-Hernandez, J. L. Cabellos, A. Huaman, B. Mendoza, and S. Barraza-Lopez (under review)