Quasi-optical electron transport across a magnetically induced junction on a topological insulator surface

Journal Article · Sun Dec 14 00:00:00 EST 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4903798· OSTI ID:22402780

Duan, Xiaopeng; Li, Xiaodong; Semenov, Yuriy G.

Quasi-optical Dirac electron transport is theoretically analyzed at the magnetic boundaries on a topological insulator (TI) surface. The electronic band mismatch induced by the spatially varying magnetization profile can form an effective junction akin to the electrostatic potential step. The transmission/reflection characteristics show a direct dependence on electron energy and incident angle with highly asymmetric patterns. The investigation also illustrates a nontrivial anomalous Hall current along the boundary which is further shown by a numerical simulation based on the finite-difference time-domain method. The results provide key design guidelines for prospective quasi-optical devices based on the TI-magnet heterostructures.

• OSTI ID: 22402780
• Journal Information: Journal of Applied Physics, Vol. 116, Issue 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ASYMMETRY
COMPUTERIZED SIMULATION
CURRENTS
ELECTRONS
MAGNETIZATION
MAGNETS
POTENTIALS
SURFACES
TOPOLOGY