Signatures of Self-Trapping in the Driven-Dissipative Bose-Hubbard Dimer

• URL: http://arxiv.org/abs/2102.04076v2
• Date: Thu, 13 May 2021 15:29:24 GMT
• Title: Signatures of Self-Trapping in the Driven-Dissipative Bose-Hubbard Dimer
• Abstract summary: We investigate signatures of a self-trapping transition in the driven-dissipative Bose Hubbard dimer. We find clear signatures of a localization-delocalization crossover as a function of hopping to interaction ratio. A finite a pump-loss asymmetry restores a delocalization crossover in the steady-state imbalance and leads to a finite intra-dimer dissipation.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigate signatures of a self-trapping transition in the driven-dissipative Bose Hubbard dimer, in presence of incoherent pump and single-particle losses. For fully symmetric couplings the stationary state density matrix is independent of any Hamiltonian parameter, and cannot therefore capture the competition between hopping-induced delocalization and the interaction-dominated self-trapping regime. We focus instead on the exact quantum dynamics of the particle imbalance after the system is prepared in a variety of initial states, and on the frequency-resolved spectral properties of the steady state, as encoded in the single-particle Green's functions. We find clear signatures of a localization-delocalization crossover as a function of hopping to interaction ratio. We further show that a finite a pump-loss asymmetry restores a delocalization crossover in the steady-state imbalance and leads to a finite intra-dimer dissipation.

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