Quasi-universal transient behavior of a nonequilibrium Mott insulator driven by an electric field
| Autor: | Mikelsons, K., Freericks, J. K., Krishnamurthy, H. R. |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Physical Review Letters 109, 260402 (2012) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.109.260402 |
| Popis: | 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 quasi-universal 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 quasi-universal behavior of the current and spectral function for different values of the hopping. Comment: (5 pages, 5 figures, ReVTeX) |
| Databáze: | arXiv |
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