Topological states and interplay between spin-orbit and Zeeman interactions in a spinful Su-Schrieffer-Heeger nanowire

Zhi Hai Liu, O. Entin-Wohlman, A. Aharony, J. Q. You, H. Q. Xu

Research output: Contribution to journalArticlepeer-review

Abstract

The interplay between the spin-orbit and Zeeman interactions acting on a spinful Su-Schrieffer-Heeger model is studied based on an InAs nanowire subjected to a periodic gate potential along the axial direction. It is shown that a nontrivial topological phase can be achieved by regulating the confining-potential configuration. In the absence of the Zeeman field, we prove that the topology of the chain is not affected by the Rashba spin-orbit interaction due to the persisting chiral symmetry. The energies of the edge modes can be manipulated by varying the magnitude and direction of the external magnetic field. Remarkably, the joint effect of the two spin-related interactions leads to novel edge states that appear in the gap formed by the anticrossing of the bands of a finite spinful dimerized chain, and can be merged into the bulk states by tilting the magnetic-field direction.

Original languageEnglish
Article number085302
JournalPhysical Review B
Volume104
Issue number8
DOIs
StatePublished - 15 Aug 2021

Funding

FundersFunder number
National Natural Science Foundation of China11934010, 91221202, 11874071, 91421303
Ministry of Science and Technology of the People's Republic of China
Israel Science Foundation
Ministry of Science and Technology, Israel3-11173
PAZY Foundation
National Key Research and Development Program of China2016YFA0300601, 2017YFA0303304
Special Project for Research and Development in Key areas of Guangdong Province2020B0303060001
Beijing Academy of Quantum Information SciencesY18G22

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