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Ultrafast Quenching of the Exchange Interaction in a Mott Insulator

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Volltexte (frei zugänglich)

PhysRevLett.113.057201.pdf
(Verlagsversion), 508KB

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Zitation

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.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0028-1682-6
Zusammenfassung
We investigate how fast and how effective photocarrier excitation can modify the exchange interaction Jex in the prototype Mott-Hubbard insulator. We demonstrate an ultrafast quenching of Jex 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 Jex emerges already within a few electron hopping times after the pulse, with a reduction that is comparable to the effect of chemical doping.