Time evolution of wave-packets in topological insulators

ORAL

Abstract

Topological insulators (TIs) are a fantastic new class of materials that have gapless helical surface (3D TIs) or edge (2D TIs) states embedded within the bulk gap of its host material. This unique property rises from an interface between materials with topologically inequivalent sets of bands structures, i.e. gaps with different signs. Here we investigate the time-evolution of wave-packets in TIs. Within the Dirac equation, the interference between eigenstates from positive and negative energy bands leads to the relativistic oscillatory behavior well known as Zitterbewegung. It was recently discussed the time evolution of the guiding center of a wave-packet in TIs converging towards the edge states. Here we show a more detailed discussion of the evolution of the full wave-packet and its behavior regarding the collision with the edges of the system.

*We acknowledge support from the Pr\'o-Reitoria de Pesquisa (PRP/USP) within the Research Support Center Initiative (NAP Q-NANO).

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Authors

  • Poliana H. Penteado

    • University of S\~ao Paulo
    • Physics Institute of S\~ao Carlos, University of S\~ao Paulo

  • Sebastian Duque Mesa

    • University of Antioquia

  • Gerson J. Ferreira

    • Physics Institute of S\~ao Carlos, University of S\~ao Paulo

  • J. Carlos Egues

    • University of S\~ao Paulo
    • Physics Institute of S\~ao Carlos, University of S\~ao Paulo