Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session M45: Higher-Order Topological Insulators
11:30 AM–2:30 PM,
Wednesday, March 17, 2021
Sponsoring
Unit:
DCMP
Chair: Frank Schindler, Princeton University
Abstract: M45.00006 : Observation of a higher-order topological bound state in the continuum*
12:30 PM–12:42 PM
Live
Presenter:
Alexander Cerjan
(Pennsylvania State University)
Authors:
Alexander Cerjan
(Pennsylvania State University)
Marius Jürgensen
(Pennsylvania State University)
Wladimir Benalcazar
(Pennsylvania State University)
Sebabrata Mukherjee
(Pennsylvania State University)
Mikael C Rechtsman
(Pennsylvania State University)
Here, we experimentally realize a higher-order topological bound state in the continuum (BIC) using a two-dimensional array of evanescently-coupled waveguides. First, by injecting light into the corner of the array, we prove that the lattice exhibits a corner-localized mode in its topological phase. Second, by using an auxiliary waveguide to couple into the array, which fixes the effective energy of the initial excitation, we show that this corner-localized mode appears at the center of the spectrum and is degenerate with bulk states of the lattice. Together, these experiments prove that the corner-localized state is a symmetry-protected BIC, and does not hybridize with the bulk bands.
Cerjan et al., in pub. at PRL, arXiv:2006.06524
*ONR N00014-20-1-2325
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