Field induced conducting state in Mott insulator

Abstract

Electron--electron repulsion, on the one hand, can result in bound pair, which has heavy effective mass. On the other hand, it is also the cause of Mott insulator. We study the effect of a staggered magnetic field on a Hubbard model. We find that a bound pair with large energy bandwidth can be formed under the resonant staggered field, being the half of Hubbard repulsion strength. Accordingly, the system exhibits following dynamical behaviors: (i) When an electric field is applied, fast bound pair Bloch oscillation occurs, while a single electron is frozen. (ii) When a quenching resonant field is applied to an initial antiferromagnetic Mott insulating state, the final state becomes doublon conducting state manifested by the non-zero $\eta$ correlator and large charge fluctuation. Our finding indicates that the cooperation of electron-electron correlation and modulated external field can induce novel quench dynamics.

9 pages, 6 figures

References in corpus (11)

• Many-Body Physics with Ultracold Gases
• Quantum Quench in the Transverse Field Ising Chain
• Repulsively bound atom pairs in an optical lattice
• The Luttinger model following a sudden interaction switch-on
• Exact relaxation in a class of non-equilibrium quantum lattice systems
• Strongly Correlated Quantum Walks in Optical Lattices
• Dephasing and the steady state in quantum many-particle systems
• Optically induced superconductivity in striped La2-xBaxCuO4 by polarization-selective excitation in the near infrared
• Bloch-Zener oscillations
• Sudden death of particle-pair Bloch oscillation and unidirectional propagation in a one-dimensional driven optical lattice
• Fast transfer and efficient coherent separation of bound cluster in the extended Hubbard model

Cited by in corpus (1)

• Steady off-diagonal long-range order state in a half-filled dimerized Hubbard chain induced by a resonant pulsed field