Ultrafast Quenching of the Exchange Interaction in a Mott Insulator

Abstract

We investigate how fast and how effective photocarrier excitation can modify the exchange interaction $J_{\mathrm{ex}}$ in the prototype Mott-Hubbard insulator. We demonstrate an ultrafast quenching of $J_{\mathrm{ex}}$ both by evaluating exchange integrals from a time-dependent response formalism and by explicitly simulating laser-induced spin precession in an antiferromagnet that is canted by an external magnetic field. In both cases, the electron dynamics is obtained from nonequilibrium dynamical mean-field theory. We find that the modified $J_{\mathrm{ex}}$ emerges already within a few electron hopping times after the pulse, with a reduction that is comparable to the effect of chemical doping.

8 pages, 4 figures

References in corpus (5)

• Time-resolved Observation and Control of Superexchange Interactions with Ultracold Atoms in Optical Lattices
• Nonthermal antiferromagnetic order and nonequilibrium criticality in the Hubbard model
• Photo-induced states in a Mott insulator
• Nonthermal symmetry broken states in the strongly interacting Hubbard model
• Non-equilibrium magnetic interactions in strongly correlated systems

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