Edge magnetoplasmon dispersion and time-resolved plasmon transport in a quantum anomalous Hall insulator

Martinez, Luis A.; Qiu, Gang; Deng, Peng; Zhang, Peng; Ray, Keith G.; Tai, Lixuan; Wei, Ming-Tso; He, Haoran; Wang, Kang L.; DuBois, Jonathan L.; Qu, Dong-Xia

doi:10.1103/PhysRevResearch.6.013081

Edge magnetoplasmon dispersion and time-resolved plasmon transport in a quantum anomalous Hall insulator

Journal Article · Tue Jan 23 00:00:00 UTC 2024 · Physical Review Research

DOI:https://doi.org/10.1103/PhysRevResearch.6.013081· OSTI ID:2282359

; Qiu, Gang; ; Zhang, Peng; Ray, Keith G.; Tai, Lixuan; Wei, Ming-Tso; He, Haoran; Wang, Kang L.; DuBois, Jonathan L.;

A quantum anomalous Hall (QAH) insulator breaks reciprocity by combining magnetic polarization and spin-orbit coupling to generate a unidirectional transmission of signals in the absence of an external magnetic field. Such behavior makes QAH materials a good platform for the innovation of circulator technologies. However, it remains elusive as to how the wavelength of the chiral edge plasmon relates to its frequency and how the plasmon wave packet is excited in the time domain in a QAH insulator. Here, we investigate the edge magnetoplasmon (EMP) resonances in Cr-(Bi,Sb) $_{2} {Te}_{3}$ by frequency and time domain measurements. From disk shaped samples with various dimensions, we obtain the dispersion relation of EMPs and extract the drift velocity of the chiral edge state. From the time-resolved transport measurements, we identify the velocity of the plasmon wave packet and observe a transition from the edge to bulk transport at an elevated temperature. We show that the frequency and time domain measurements are well modeled by loss from the microwave induced dissipative channels in the bulk area. Our results demonstrate that the EMP decay rate can be significantly reduced by applying a low microwave power and fabricating devices of larger diameter $\geq 100 µ m$ . In a $R = 125 µ m$ sample, a nonreciprocity of 20 dB has been realized at 1.3 GHz, shining light on using QAH insulators to develop on-chip nonreciprocal devices.

Published by the American Physical Society 2024

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2282359

Alternate ID(s):: OSTI ID: 2315096

Report Number(s):: LLNL--JRNL-853209; 013081

Journal Information:: Physical Review Research, Journal Name: Physical Review Research Journal Issue: 1 Vol. 6; ISSN PPRHAI; ISSN 2643-1564

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
edge states
plasmonics
quantum anomalous hall effect

Edge magnetoplasmon dispersion and time-resolved plasmon transport in a quantum anomalous Hall insulator

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