Ultrafast Quenching of the Exchange Interaction in a Mott Insulator

Mentink, Johan H.; Eckstein, Martin

doi:10.1103/PhysRevLett.113.057201

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Ultrafast Quenching of the Exchange Interaction in a Mott Insulator

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http://dx.doi.org/10.1103/PhysRevLett.113.057201
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http://arxiv.org/abs/1401.5308
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PhysRevLett.113.057201.pdf
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Citation

Mentink, J. H., & Eckstein, M. (2014). Ultrafast Quenching of the Exchange Interaction in a Mott Insulator. Physical Review Letters, 113(5): 057201. doi:10.1103/PhysRevLett.113.057201.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0028-1682-6

Abstract

We investigate how fast and how effective photocarrier excitation can modify the exchange interaction J_ex in the prototype Mott-Hubbard insulator. We demonstrate an ultrafast quenching of J_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_ex emerges already within a few electron hopping times after the pulse, with a reduction that is comparable to the effect of chemical doping.