천상모
2017-08-03T05:59:45Z
2017-08-03T05:59:45Z
2015-10
SCIENCE, v. 350, NO 6257, Page 182-185
0036-8075
1095-9203
http://science.sciencemag.org/content/350/6257/182
http://hdl.handle.net/20.500.11754/28254
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.
This work was supported by the Institute for Basic Science (IBS-R014-D1). We thank K. S. Kim and H. W. Lee for discussions. H.W.Y. appreciates the initial work of S. Takeda and D. M. Oh in shaping the soliton idea in In/Si(111).
en
AMER ASSOC ADVANCEMENT SCIENCE
CONJUGATED DIATOMIC POLYMER
QUANTIZED HALL CONDUCTANCE
TOPOLOGICAL INSULATORS
CHARGE
INSTABILITY
TRANSPORT
SURFACE
Chiral solitons in a coupled double Peierls chain
Article
10.1126/science.aaa7055
SCIENCE
Cheon, Sangmo
Kim, Tae-Hwan
Lee, Sung-Hoon
Yeom, Han Woong
2015017311
S
COLLEGE OF NATURAL SCIENCES[S]
DEPARTMENT OF PHYSICS
sangmocheon