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Proceedings Paper

Time-evolution of wave-packets in topological insulators (Presentation Recording)
Author(s): Gerson J. Ferreira; Poliana H. Penteado; José Carlos Egues
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Paper Abstract

The electronic structure of topological insulators (TIs) are well described Dirac-like equations, e.g. the BHZ model, with a mass term that changes sign at some interface. This simplistic description includes a pseudo-spin-orbit coupling that is intrinsic to the Dirac Hamiltonian. Consequently, the TIs share common properties with the Dirac equation. Among them, the interference between positive and negative energy bands leads to the relativistic oscillatory motion known as the Zitterbewegung. Here we discuss the ballistic time-evolution (pico and nanoseconds) of wave-packets in TIs in the presence of an external electric field. We show that the guiding center of large wave-packets have a finite motion transversal to the electric field equivalent to side-jump in Rashba GaAs. However, for narrow wave-packets the dynamics change and the guiding center description is not complete. We also discuss the reflection of a wave-packet colliding with the edge of the system and the effects of the edge states. Acknowledgement: We acknowledge support from CAPES, CPNq, FAPEMIG, FAPESP, and NAP Q-NANO from PRP/USP.

Paper Details

Date Published: 5 October 2015
PDF: 1 pages
Proc. SPIE 9551, Spintronics VIII, 955119 (5 October 2015); doi: 10.1117/12.2187989
Show Author Affiliations
Gerson J. Ferreira, Univ. Federal de Uberlândia (Brazil)
Poliana H. Penteado, Univ. de São Paulo (Brazil)
José Carlos Egues, Univ. de São Paulo (Brazil)


Published in SPIE Proceedings Vol. 9551:
Spintronics VIII
Henri-Jean Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi, Editor(s)

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