Quasi-optical electron transport across a magnetically induced junction on a topological insulator surface
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 10, 2014
- Source ID
- 10.1063/1.4903798
Entities
People
- K. W. Kim
- Xiaodong Li
- Xiaopeng Duan
- Yuriy G. Semenov
Organizations
- Army Research Office
- North Carolina State University
- Semiconductor Research Corporation