Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session A14: 2D Materials (Metals, Superconductors, and Correlated Materials) -- CDWs
8:00 AM–10:36 AM,
Monday, March 4, 2019
BCEC
Room: 153C
Sponsoring
Units:
DMP DCOMP
Chair: Daniel Rhodes, Columbia Univ
Abstract: A14.00011 : Charge density wave order in a transition metal dichalcogenide probed by second harmonic generation*
10:00 AM–10:12 AM
Presenter:
Bryan Fichera
(Massachusetts Institute of Technology)
Authors:
Bryan Fichera
(Massachusetts Institute of Technology)
Anshul Kogar
(Massachusetts Institute of Technology)
Linda Ye
(Massachusetts Institute of Technology)
Joseph Checkelsky
(Massachusetts Institute of Technology)
Nuh Gedik
(Massachusetts Institute of Technology)
Rotational anisotropy second harmonic generation (RA-SHG) is a nonlinear optical probe which has been used to study electronic order in solid state materials. Because the leading-order contribution to the second harmonic signal is zero in the bulk of centrosymmetric crystals, RA-SHG can be used to study the surface properties of ordered materials. We use RA-SHG to study electronic order on the surface of a transition metal dichalcogenide (TMD). We find that the symmetry-breaking character of ordered charge density wave (CDW) states in the TMD can be identified using RA-SHG, and that our technique can be used to differentiate surface CDW domains. We also posit a new framework for understanding RA-SHG data from crystal structures with incommensurate charge order.
*Financial support from the U.S. Department of Energy, the Gordon and Betty Moore Foundation, and from Shell is gratefully ackowledged.
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