Wannier-Stark states and Bloch oscillations in the honeycomb lattice

Abstract

We study a quantum particle in a tilted honeycomb lattice in the tight-binding approximation. First we discuss the particle eigenstates, i.e., the stationary Wannier-Stark states. These states are proved to be extended states for the rational directions of the static field and localized states for the irrational directions. We find energy bands of the extended states and analyze the localized states. It is shown, in particular, that the localized `honeycomb' Wannier-Stark states are chaotic states with irregular dependence of the localization length on the static field magnitude. Second we discuss Bloch oscillations of the quantum particle. Irregular Bloch oscillations for irrational directions are observed.

15 pages, 8 figures

References in corpus (3)

• Simulation and detection of Dirac fermions with cold atoms in an optical lattice
• Observation of a Dirac point in microwave experiments with a photonic crystal modeling graphene
• Relativistic quantum effects of Dirac particles simulated by ultracold atoms

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