Chiral solitons in a coupled double Peierls chain

被引:108
作者
Cheon, Sangmo [1 ]
Kim, Tae-Hwan [1 ,2 ]
Lee, Sung-Hoon [1 ]
Yeom, Han Woong [1 ,2 ]
机构
[1] Inst Basic Sci IBS, Ctr Artificial Low Dimens Elect Syst, Pohang 790784, South Korea
[2] Pohang Univ Sci & Technol POSTECH, Dept Phys, Pohang 790784, South Korea
关键词
CONJUGATED DIATOMIC POLYMER; QUANTIZED HALL CONDUCTANCE; TOPOLOGICAL INSULATORS; CHARGE; INSTABILITY; TRANSPORT; SURFACE;
D O I
10.1126/science.aaa7055
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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 Z(2) x Z(2) to Z(4) 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.
引用
收藏
页码:182 / 185
页数:4
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