Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-02-04
Phys. Rev. B 81, 193302 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 6 figures
Scientific paper
10.1103/PhysRevB.81.193302
We study theoretically the surface of a topological insulator with a sliding magnetic superlattice coated above. By analyzing time-dependent Dirac equations, the dynamics of the zero mode is investigated. When the superlattice's sliding velocity is smaller (larger) than the Fermi velocity of topological insulator, the zero mode is perfectly (imperfectly) pumped. We also propose the application of this setup, which rectifies currents or generates pulse currents. It would provide a prototype of electronic devices based on topological insulator.
Ezawa Motohiko
Zang Jiadong
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