Wave-vector filtering effect of electric–magnetic barrier in HgTe quantum wells

doi:10.1088/1674-1056/22/3/037304

Abstract Because of helicity of electrons in HgTe quantum wells (QWs) with inverted band structure, the electrons cannot be confined by electric barriers since electrons can tunnel the barriers perfectly without backscattering in HgTe QWs. This behavior is similar to Dirac electrons in graphene. In this paper, we propose a scheme to confine carriers in HgTe QWs using an electric–magnetic barrier. We calculate the transmission of carriers in 2-dimensional HgTe QWs and find that the wave-vector filtering effect of local magnetic fields can confine the carriers. The confining effect will have potential application in nanodevices based on HgTe QWs.

Keywords: magnetic barrier topological insulator helical states HgTe quantum well

Received: 18 October 2012
Revised: 12 December 2012
Accepted manuscript online:

PACS:	73.63.Hs	(Quantum wells)
	73.20.At	(Surface states, band structure, electron density of states)
	73.23.Ad	(Ballistic transport)
	73.40.Gk	(Tunneling)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10821403 and 11047131), the National Basic Research Program of China (Grant No. 2009CB929100), and the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20101303120005).

Corresponding Authors: Song Jun-Tao
E-mail: juntaosong@foxmail.com

Cite this article:

Zou Yong-Lian (邹永连), Song Jun-Tao (宋俊涛) Wave-vector filtering effect of electric–magnetic barrier in HgTe quantum wells 2013 Chin. Phys. B 22 037304

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