In this section
@article{Imhof:2018:10.1038/s41567-018-0246-1,
author = {Imhof, S and Berger, C and Bayer, F and Brehm, J and Molenkamp, LW and Kiessling, T and Schindler, F and Lee, CH and Greiter, M and Neupert, T and Thomale, R},
doi = {10.1038/s41567-018-0246-1},
journal = {Nature Physics},
pages = {925--929},
title = {Topolectrical-circuit realization of topological corner modes},
url = {http://dx.doi.org/10.1038/s41567-018-0246-1},
volume = {14},
year = {2018}
}
TY - JOUR
AB - 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.
AU - Imhof,S
AU - Berger,C
AU - Bayer,F
AU - Brehm,J
AU - Molenkamp,LW
AU - Kiessling,T
AU - Schindler,F
AU - Lee,CH
AU - Greiter,M
AU - Neupert,T
AU - Thomale,R
DO - 10.1038/s41567-018-0246-1
EP - 929
PY - 2018///
SN - 1745-2473
SP - 925
TI - Topolectrical-circuit realization of topological corner modes
T2 - Nature Physics
UR - http://dx.doi.org/10.1038/s41567-018-0246-1
VL - 14
ER -
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