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DY: Fachverband Dynamik und Statistische Physik

DY 12: Nonequilibrium Quantum Many-Body Systems I (joint session TT/DY)

DY 12.10: Talk

Tuesday, March 28, 2023, 12:15–12:30, HSZ 204

Correlated Mott insulators in strong electric fields: Role of phonons in heat dissipation — •Tommaso Maria Mazzocchi, Paolo Gazzaneo, Jan Lotze, and Enrico Arrigoni — Institute of Theoretical and Computational Physics, Graz University of Technology, 8010 Graz, Austria

Mott-insulating models can undergo an insulator-to-metal transition when subject to a constant bias voltage [1], which makes them suitable to describe the resistive switch observed in correlated insulators [2]. Nonequilibrium state-of-the-art techniques rely on the coupling to fermion baths to dissipate the field-induced excess energy [1,3]. However, a realistic description of heat-exchange requires the inclusion of phonons. In [4] we study a single-band Hubbard model in a static electric field coupled to electron and acoustic phonon baths. The nonequilibrium steady-state is addressed via the dynamical mean-field theory using the auxiliary master equation approach as impurity solver. Phonons are included via the Migdal approximation. Using both the electron and phonon baths the steady-state current is slightly enhanced by phonons for field strengths close to half of the gap and suppressed at the gap resonance. With phonons alone, dissipation can occur only at the resonances and the current at the metallic phase is suppressed by almost one order of magnitude.
[1] C. Aron, Phys. Rev. B 86, 085127 (2012)
[2] E. Janod et al., Adv. Funct. Mater. 25, 6277 (2015)
[3] Y. Murakami et al., Phys. Rev. B 98, 075102 (2018)
[4] T.M. Mazzocchi et al., Phys. Rev. B 106, 125123 (2022)