Control of topological phase transitions in Dirac semimetal films by exchange fields

doi:10.1088/1674-1056/26/1/017102

Abstract

The exchange field effects on topological Dirac semimetal (DSM) films are discussed in this article. A topological phase transition can be controlled by tuning the exchange field together with the quantum confinement effects. What is more interesting is that the system can transit into the quantum anomalous Hall (QAH) state from the topologically trivial state (Z₂=0) or from the topologically nontrivial state (Z₂=1), depending on the thickness of the DSM films. This provides a useful mechanism to realize the QAH state from the DSM.

Keywords: exchange field Dirac semimetal quantum anomalous Hall state quantum spin Hall state

Received: 05 July 2016
Revised: 22 October 2016
Accepted manuscript online:

PACS:	71.20.-b	(Electron density of states and band structure of crystalline solids)
	73.20.At	(Surface states, band structure, electron density of states)
	73.22.Gk	(Broken symmetry phases)
	73.43.Nq	(Quantum phase transitions)

Fund:

Project supported by the National Natural Science Foundation of China (Grant No. 11574019).

Corresponding Authors: Hai-Long Wang, Hui Pan
E-mail: hlwang@buaa.edu.cn;hpan@buaa.edu.cn

Cite this article:

Fei Yang(杨菲), Hai-Long Wang(王海龙), Hui Pan(潘晖) Control of topological phase transitions in Dirac semimetal films by exchange fields 2017 Chin. Phys. B 26 017102

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