University of Minnesota
School of Physics & Astronomy
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Publications

Alex Kamenev

“Doublon Relaxation in the Bose-Hubbard Model”
A. L. Chudnovskiy, D. M. Gangardt, and A. Kamenev, Phys. Rev. Lett. 108, 085302 (2012)

Download from http://prl.aps.org/abstract/PRL/v108/i8/e085302

Abstract

The decay of a high-energy double occupancy state, doublon, in a narrow-band lattice requires the creation of a coherent many-particle excitation. This leads to an exponentially long relaxation time of such a state. We show that, if the average occupation number is sufficiently small, the corresponding exponent may be evaluated exactly. To this end we develop the quasiclassical approach to calculation of the high-order tree-level decay amplitudes.