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Chiral solitons in a coupled double Peierls chain

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Title
Chiral solitons in a coupled double Peierls chain
Author(s)
Sangmo Cheon; Tae-Hwan Kim; Sung-Hoon Lee; Han Woong Yeom
Publication Date
2015-10
Journal
SCIENCE, v.350, no.6257, pp.182 - 185
Publisher
AMER ASSOC ADVANCEMENT SCIENCE
Abstract
Chiral edge states are the hallmark of two- and three-dimensional topological materials, but their one-dimensional (1D) analog has not yet been found. We report that the 1D topological edge states, solitons, of the charge density wave system of indium atomic wires self-assembled on a silicon surface have chirality. The system is described by a coupled double Peierls-dimerized atomic chain, where the interchain coupling induces dynamical sublattice symmetry breaking. This changes its topological symmetry from Z2 Z2 to Z4 and endows solitons with a chiral degree of freedom. Chiral solitons can produce quantized charge transport across the chain that is topologically protected and controllable by the soliton’s chirality. Individual right- and left-chiral solitons in indium wires are directly identified by scanning tunneling microscopy.
URI
https://pr.ibs.re.kr/handle/8788114/1862
ISSN
0036-8075
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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