Magnetic quantum ring in two-dimensional topological insulators

被引：4
|
作者：
Li, Guo [1 ,2 ]
Yang, Ning [1 ]
Chu, Weidong [1 ]
Song, Haifeng [1 ]
Zhu, Jia-Lin [2 ]
机构：
[1] Inst Appl Phys & Computat Math, Beijing 100088, Peoples R China
[2] Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum, Beijing 100084, Peoples R China
来源：
PHYSICS LETTERS A | 2019年 / 383卷 / 28期
基金：
中国国家自然科学基金;
关键词：
Topological insulators; Magnetic edge states; Angular momentum transitions; Resonance tunneling; INTERFERENCE; TRANSPORT; STATES;
D O I：
10.1016/j.physleta.2019.125865
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The quantum properties of topological insulator magnetic quantum rings formed by inhomogeneous magnetic fields are investigated using a series expansion method for the modified Dirac equation. Cycloid like and snake-like magnetic edge states are respectively found in the bulk gap for the normal and inverted magnetic field profiles. The energy spectra, current densities and classical trajectories of the magnetic edge states are discussed in detail. The bulk band inversion is found to manifest itself through the angular momentum transition in the ground state for the cycloid-like states and the resonance tunneling effect for the snake-like states. (C) 2019 Elsevier B.V. All rights reserved.
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页数：5
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