Bosonic representation of a Lipkin-Meshkov-Glick model with Markovian dissipation

• URL: http://arxiv.org/abs/2004.02232v3
• Date: Tue, 6 Oct 2020 10:12:05 GMT
• Title: Bosonic representation of a Lipkin-Meshkov-Glick model with Markovian dissipation
• Authors: Jan C. Louw, Michael Kastner and Johannes N. Kriel
• Abstract summary: We study the dynamics of a Lipkin-Meshkov-Glick model in the presence of Markovian dissipation. We use degenerate perturbation theory in the weak-dissipation limit to analytically obtain the eigenvalues and eigenvectors of the Liouvillian superoperator.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We study the dynamics of a Lipkin-Meshkov-Glick model in the presence of Markovian dissipation, with a focus on late-time dynamics and the approach to thermal equilibrium. Making use of a vectorized bosonic representation of the corresponding Lindblad master equation, we use degenerate perturbation theory in the weak-dissipation limit to analytically obtain the eigenvalues and eigenvectors of the Liouvillian superoperator, which in turn give access to closed-form analytical expressions for the time evolution of the density operator and observables. Our approach is valid for large systems, but takes into account leading-order finite-size corrections to the infinite-system result. As an application, we show that the dissipative Lipkin-Meshkov-Glick model equilibrates by passing through a continuum of thermal states with damped oscillations superimposed, until finally reaching an equilibrium state with a temperature that in general differs from the bath temperature. We discuss limitations of our analytic techniques by comparing to exact numerical results.

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