Ferromagnetic barrier-induced negative differential conductance on the surface of a topological insulator

doi:10.1088/1674-1056/23/10/107301

Abstract The effect of the negative differential conductance of a ferromagnetic barrier on the surface of a topological insulator is theoretically investigated. Due to the changes of the shape and position of the Fermi surfaces in the ferromagnetic barrier, the transport processes can be divided into three kinds: the total, partial, and blockade transmission mechanisms. The bias voltage can give rise to the transition of the transport processes from partial to blockade transmission mechanisms, which results in a considerable effect of negative differential conductance. With appropriate structural parameters, the current-voltage characteristics show that the minimum value of the current can reach to zero in a wide range of the bias voltage, and then a large peak-to-valley current ratio can be obtained.

Keywords: topological insulator negative differential conductance ferromagnetic barrier

Received: 03 March 2014
Revised: 21 April 2014
Accepted manuscript online:

PACS:	73.25.+i	(Surface conductivity and carrier phenomena)
	73.23.-b	(Electronic transport in mesoscopic systems)
	85.35.Be	(Quantum well devices (quantum dots, quantum wires, etc.))

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11104059 and 61176089).

Corresponding Authors: An Xing-Tao
E-mail: anxt@hku.hk

About author: 73.25.+i; 73.23.-b; 85.35.Be

Cite this article:

An Xing-Tao (安兴涛) Ferromagnetic barrier-induced negative differential conductance on the surface of a topological insulator 2014 Chin. Phys. B 23 107301


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Ferromagnetic barrier-induced negative differential conductance on the surface of a topological insulator

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