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Dynamical Band Flipping in Fermionic Lattice Systems: An ac-Field-Driven Change of the Interaction from Repulsive to Attractive

Naoto Tsuji, Takashi Oka, Philipp Werner, and Hideo Aoki
Phys. Rev. Lett. 106, 236401 – Published 6 June 2011
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Abstract

We show theoretically that the sudden application of an appropriate ac field to correlated lattice fermions flips the band structure and effectively switches the interaction from repulsive to attractive. The nonadiabatically driven system is characterized by a negative temperature with a population inversion. We numerically demonstrate the converted interaction in an ac-driven Hubbard model with the nonequilibrium dynamical mean-field theory solved by the continuous-time quantum Monte Carlo method. Based on this, we propose an efficient ramp-up protocol for ac fields that can suppress heating, which leads to an effectively attractive Hubbard model with a temperature below the superconducting transition temperature of the equilibrium system.

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  • Received 16 August 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.236401

© 2011 American Physical Society

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Changing repulsion into attraction with the quantum Hippy Hippy Shake

Published 6 June 2011

A quick-acting ac field may change the repulsive interaction in a system of correlated electrons to an attractive one.

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Authors & Affiliations

Naoto Tsuji1, Takashi Oka1, Philipp Werner2, and Hideo Aoki1

  • 1Department of Physics, University of Tokyo, Hongo, Tokyo 113-0033, Japan
  • 2Theoretical Physics, ETH Zurich, 8093 Zürich, Switzerland

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Issue

Vol. 106, Iss. 23 — 10 June 2011

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