Second harmonic generation as a probe of broken mirror symmetry
Name
PhysRevB.101.241106.pdf
Description
Published version
Size
717.34 KB
Format
Adobe PDF
Checksum (MD5)
3c0afa93e059ffde798197ba0a6df0b9
Author(s)
Fichera, Bryan T.
Kogar, Anshul
Ye, Linda
Gokce, Bilal
Zong, A
Checkelsky, Joseph
Gedik, Nuh
Date Issued
June 2020
Journal
Physical Review B
Publisher
American Physical Society (APS)
Citation
Fichera, Bryan T. et al. "Second harmonic generation as a probe of broken mirror symmetry." Physical Review B 101, 24 (June 2020): 241106(R) © 2020 American Physical Society
Version
Final published version
Abstract
The notion of spontaneous symmetry breaking has been used to describe phase transitions in a variety of physical systems. In crystalline solids, the breaking of certain symmetries, such as mirror symmetry, is difficult to detect unambiguously. Using 1T-TaS2, we demonstrate here that rotational-anisotropy second harmonic generation (RA-SHG) is not only a sensitive technique for the detection of broken mirror symmetry, but also that it can differentiate between mirror symmetry-broken structures of opposite planar chirality. We also show that our analysis is applicable to a wide class of different materials with mirror symmetry-breaking transitions. Lastly, we find evidence for bulk mirror symmetry-breaking in the incommensurate charge density wave phase of 1T-TaS2. Our results pave the way for RA-SHG to probe candidate materials where broken mirror symmetry may play a pivotal role.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.101.241106
