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Phys Rev Lett. 2001 Apr 2;86(14):3116-9.

Wannier-Stark states of a quantum particle in 2D lattices.

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1
Fachbereich Physik, Universität Kaiserslautern, D-67653 Kaiserslautern, Germany.

Abstract

A simple method of calculating the Wannier-Stark resonances in 2D lattices is suggested. Using this method we calculate the complex Wannier-Stark spectrum for a nonseparable 2D potential realized in optical lattices and analyze its general structure. The dependence of the lifetime of Wannier-Stark states on the direction of the static field (relative to the crystallographic axis of the lattice) is briefly discussed.

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