Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session A03: Low Dimensional Topological Materials: Growth, Characterization and Imaging
8:00 AM–11:00 AM,
Monday, March 4, 2024
Room: L100C
Sponsoring
Unit:
DMP
Chair: Wenhao Liu, University of Texas at Dallas
Abstract: A03.00013 : Chiral Phonons and Helical Polarization in ZrOS*
10:48 AM–11:00 AM
Presenter:
Boyang Zhao
(University of Southern California)
Authors:
Boyang Zhao
(University of Southern California)
Batyr Ilyas
(Massachusetts Institute of Technology MIT)
Jiang Luo
(Washington University in St. Louis)
SHANTANU SINGH
(University of Southern California)
Guodong Ren
(Washington University in St.Louis)
Tzu-Chi Huang
(National Synchrotron Radiation Research Center)
Huandong Chen
(University of Southern California)
Bi-Hsuan Lin
(National Synchrotron Radiation Research Center)
Rohan Mishra
(Washington University, St. Louis)
Nuh Gedik
(Massachusetts Institute of Technology)
Jayakanth Ravichandran
(University of Southern California)
In this work4, we synthesized ZrOS crystals in the chiral P213 space group with varying enantiomeric compositions from left- to right-handedness. Single crystal X-ray diffraction revealed a tetrahedral anion-ordered dipolar structure with anisotropic electron density. Electrical polarization is intimately tied to the right- or left-handed 31 or 32 helical axes and manifests as polarization helices. The optical activity of ZrOS is dictated by a pseudo-angular momentum Raman splitting near the Γ-point in the Brillouin zone, which is consistent with the first-principles calculations of the chiral phonons in ZrOS. Moreover, left- and right-handed ZrOS enantiomers can be coherently twinned by a stacking fault in the pseudo-FCC stacking sequence. As-grown ZrOS crystals commonly adopt an unequal amount of left and right-handed domains. We demonstrate the spatial imaging of the domain handedness of ZrOS crystals using noncontact and non-destructive Raman measurements. This work sets up ZrOS as a model chiral crystal to explore novel physical phenomena.
*Acknowledgments: This work was supported by ARO MURI grant # W911NF-21-1-0327 and NSF through DMR-2122070, DMR-2122071 and DMR-2145797.
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