Ultrafast Quenching of the Exchange Interaction in a Mott Insulator

  title={Ultrafast Quenching of the Exchange Interaction in a Mott Insulator},
  author={Johan H. Mentink and Martin Eckstein},
  journal={Physical Review Letters},
The exchange interaction determines the ordering of microscopic spins in magnetic materials. While often considered static, here we report calculations of time-dependent nonequilibrium exchange interactions in a Mott insulator. The results suggest that free charge carriers created by (photo) excitation can cause an ultrafast quench of the exchange interaction. 

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