Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session M59: Disorder and Defects in Topological Materials
8:00 AM–10:00 AM,
Wednesday, March 16, 2022
Room: Hyatt Regency Hotel -DuSable AB
Sponsoring
Unit:
DCMP
Chair: Suyang Xu, Harvard University
Abstract: M59.00002 : Symmetry-protected, zero-energy disclination modes and their observation in an acoustic lattice*
8:12 AM–8:24 AM
Presenter:
Yuanchen Deng
(Penn State University)
Authors:
Yuanchen Deng
(Penn State University)
Wladimir A Benalcazar
(Princeton University)
Zeguo Chen
(Hong Kong Baptist University)
Mourad Oudich
(Penn State University)
Guancong Ma
(Hong Kong Baptist University)
Yun Jing
(Penn State University)
However, in current realizations, these modes are not protected from delocalization because so far, experimentally realized mode-trapping disclinations have broken chiral symmetry. As such, their modes do not lie at mid-gap and can hybridize with bulk modes to form resonances, losing their confinement. Here, we devise a fundamentally new paradigm that allows the protection of modes bound to disclinations that preserve chiral symmetry so that the disclination modes are consequently pinned at the mid-gap. In this way, they are protected at maximal confinement. By presenting a protection mechanism that rests on the interplay between the topology of the lattice and the point group symmetry of defects and by experimentally probing these modes in judiciously designed chiral-symmetric acoustic lattices, our work demonstrates the existence of protected modes within the bulk of synthetic lattices.
*Y.J. thanks for the support from NSF through CMMI-1951221 and CMMI-2039463. W.A.B. thanks the support of the Eberly Postdoctoral Fellowship at the Pennsylvania State University. G. M. is supported by Hong Kong Research Grants Council (12302420, 12300419, 22302718, C6013-18G), National Natural Science Foundation of China Excellent Young Scientist Scheme (Hong Kong Macau) (11922416), and Youth Program (11802256).
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700