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Nanomechanical characterization of quantum interference in a topological insulator nanowire

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Title
Nanomechanical characterization of quantum interference in a topological insulator nanowire
Author(s)
Minjin Kim; Jihwan Kim; Yasen Hou; Dong Yu; Yong-Joo Doh; Bongsoo Kim; Kun Woo Kim; Junho Suh
Publication Date
2019-10
Journal
NATURE COMMUNICATIONS, v.10, no.1, pp.4522 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Aharonov–Bohm conductance oscillations emerge as a result of gapless surface states in topological insulator nanowires. This quantum interference accompanies a change in the number of transverse one-dimensional modes in transport, and the density of states of such nanowires is also expected to show Aharonov–Bohm oscillations. Here, we demonstrate a novel characterization of topological phase in Bi2Se3 nanowire via nanomechanical resonance measurements. The nanowire is configured as an electromechanical resonator such that its mechanical vibration is associated with its quantum capacitance. In this way, the number of one-dimensional transverse modes is reflected in the resonant frequency, thereby revealing Aharonov–Bohm oscillations. Simultaneous measurements of DC conductance and mechanical resonant frequency shifts show the expected oscillations, and our model based on the gapless Dirac fermion with impurity scattering explains the observed quantum oscillations successfully. Our results suggest that the nanomechanical technique would be applicable to a variety of Dirac materials. © The Author(s) 2019
URI
https://pr.ibs.re.kr/handle/8788114/6355
ISSN
2041-1723
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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