Please use this identifier to cite or link to this item: https://doi.org/10.1038/s41567-018-0246-1
Title: Topolectrical-circuit realization of topological corner modes
Authors: Imhof, Stefan
Berger, Christian
Bayer, Florian
Brehm, Johannes
Molenkamp, Laurens W
Kiessling, Tobias
Schindler, Frank
Lee, Ching Hua 
Greiter, Martin
Neupert, Titus
Thomale, Ronny
Keywords: Science & Technology
Physical Sciences
Physics, Multidisciplinary
Physics
WEYL POINTS
INSULATOR
STATES
PROTECTION
PHASE
Issue Date: 1-Sep-2018
Publisher: NATURE PUBLISHING GROUP
Citation: Imhof, Stefan, Berger, Christian, Bayer, Florian, Brehm, Johannes, Molenkamp, Laurens W, Kiessling, Tobias, Schindler, Frank, Lee, Ching Hua, Greiter, Martin, Neupert, Titus, Thomale, Ronny (2018-09-01). Topolectrical-circuit realization of topological corner modes. NATURE PHYSICS 14 (9) : 925-+. ScholarBank@NUS Repository. https://doi.org/10.1038/s41567-018-0246-1
Abstract: Quantized electric quadrupole insulators have recently been proposed as novel quantum states of matter in two spatial dimensions. Gapped otherwise, they can feature zero-dimensional topological corner mid-gap states protected by the bulk spectral gap, reflection symmetries and a spectral symmetry. Here we introduce a topolectrical circuit design for realizing such corner modes experimentally and report measurements in which the modes appear as topological boundary resonances in the corner impedance profile of the circuit. Whereas the quantized bulk quadrupole moment of an electronic crystal does not have a direct analogue in the classical topolectrical-circuit framework, the corner modes inherit the identical form from the quantum case. Due to the flexibility and tunability of electrical circuits, they are an ideal platform for studying the reflection symmetry-protected character of corner modes in detail. Our work therefore establishes an instance where topolectrical circuitry is employed to bridge the gap between quantum theoretical modelling and the experimental realization of topological band structures.
Source Title: NATURE PHYSICS
URI: https://scholarbank.nus.edu.sg/handle/10635/193753
ISSN: 17452473
17452481
DOI: 10.1038/s41567-018-0246-1
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