Decay and fragmentation in an open Bose-Hubbard chain

Kordas, G.; Wimberger, S.; Witthaut, Dirk

doi:10.1103/PhysRevA.87.043618

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Decay and fragmentation in an open Bose-Hubbard chain

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Witthaut, Dirk
Max Planck Research Group Network Dynamics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Kordas, G., Wimberger, S., & Witthaut, D. (2013). Decay and fragmentation in an open Bose-Hubbard chain. Physical Review A, 87: 043618. doi:10.1103/PhysRevA.87.043618.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-1003-5

Abstract

We analyze the decay of ultracold atoms from an optical lattice with loss from a single lattice site. If the initial state is dynamically stable, a suitable amount of dissipation can stabilize a Bose-Einstein condensate, such that it remains coherent even in the presence of strong interactions. A transition between two dynamical phases is observed if the initial state is dynamically unstable. This transition is analyzed here in detail. For strong interactions, the system relaxes to an entangled quantum state with remarkable statistical properties: The atoms bunch in a few “breathers” forming at random positions. Breathers at different positions are coherent, such that they can be used in precision quantum interferometry and other applications.