Bloch-Zener Oscillations in Graphene and Topological Insulators

Details Bloch-Zener Oscillations in Graphene and Topological Insulators Bloch-Zener Oscillations in Graphene and Topological Insulators

2011-09-26

arxiv.org/abs/1109.5541v2

Phys. Rev. B 85, 115433 (2012)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.85.115433

We show that superlattices based on zero-gap semiconductors such as graphene and mercury telluride exhibit characteristic Bloch--Zener oscillations that emerge from the coherent superposition of Bloch oscillations and multiple Zener tunneling between the electron and hole branch. We demonstrate this mechanism by means of wave packet dynamics in various spatially periodically modulated nanoribbons subject to an external bias field. The associated Bloch frequencies exhibit a peculiar periodic bias dependence which we explain within a two-band model. Supported by extensive numerical transport calculations, we show that this effect gives rise to distinct current oscillations observable in the I-V characteristics of graphene and mercury telluride superlattices.

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