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Quasiuniversal Transient Behavior of a Nonequilibrium Mott Insulator Driven by an Electric Field

Mikelsons, K and Freericks, JK and Krishnamurthy, HR (2012) Quasiuniversal Transient Behavior of a Nonequilibrium Mott Insulator Driven by an Electric Field. In: PHYSICAL REVIEW LETTERS, 109 (26).

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.109.260402

Abstract

We use a self-consistent strong-coupling expansion for the self-energy (perturbation theory in the hopping) to describe the nonequilibrium dynamics of strongly correlated lattice fermions. We study the three-dimensional homogeneous Fermi-Hubbard model driven by an external electric field showing that the damping of the ensuing Bloch oscillations depends on the direction of the field and that for a broad range of field strengths a long-lived transient prethermalized state emerges. This long-lived transient regime implies that thermal equilibrium may be out of reach of the time scales accessible in present cold atom experiments but shows that an interesting new quasiuniversal transient state exists in nonequilibrium governed by a thermalized kinetic energy but not a thermalized potential energy. In addition, when the field strength is equal in magnitude to the interaction between atoms, the system undergoes a rapid thermalization, characterized by a different quasiuniversal behavior of the current and spectral function for different values of the hopping. DOI: 10.1103/PhysRevLett.109.260402

Item Type: Journal Article
Additional Information: Copy right for this article belongs to AMER PHYSICAL SOC, USA
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Francis Jayakanth
Date Deposited: 05 Feb 2013 09:48
Last Modified: 05 Feb 2013 09:48
URI: http://eprints.iisc.ac.in/id/eprint/45726

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