Ultrafast Quenching of the Exchange Interaction in a Mott Insulator

@article{Mentink2014UltrafastQO,
  title={Ultrafast Quenching of the Exchange Interaction in a Mott Insulator},
  author={Johan H. Mentink and Martin Eckstein},
  journal={Physical Review Letters},
  year={2014},
  volume={113},
  pages={057201}
}
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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References

SHOWING 1-10 OF 37 REFERENCES
Ultrafast spin dynamics in ferromagnetic nickel.
TLDR
The relaxation processes of electrons and spins systems following the absorption of femtosecondoptical pulses in ferromagnetic nickel have been studied using optical and magneto-optical pump-probetechniques and the experimental results are adequately described by a model including three interacting reservoirs.
Exchange interactions and spin-wave stiffness in ferromagnetic metals
Rigorous expressions for the exchange parameters and the spin-wave stiffness constant of ferromagnetic metals are obtained using a local spin-density functional formalism and the muffin-tin potential…
Nonthermal symmetry-broken states in the strongly interacting Hubbard model
We study the time evolution of the antiferromagnetic order parameter after interaction quenches in the Hubbard model. Using the nonequilibrium dynamical mean-field formalism, we show that the system,…
Transient ferromagnetic-like state mediating ultrafast reversal of antiferromagnetically coupled spins
TLDR
It is found that the ultrafast spin reversal in GdFeCo, where spins are coupled antiferromagnetically, occurs by way of a transient ferromagnetic-like state, which provides a concept for the possibility of manipulating magnetic order on the timescale of the exchange interaction.
Ultrafast optical manipulation of magnetic order
The interaction of subpicosecond laser pulses with magnetically ordered materials has developed into a fascinating research topic in modern magnetism. From the discovery of subpicosecond…
I
AIV Assembly, Integration, Verification AOA Angle of Attack CAD Computer Aided Design CFD Computational Fluid Dynamics GLOW Gross Lift-Off Mass GNC Guidance Navigation and Control IR Infra-Red LEO…
APPL
TLDR
A prototype probability package named APPL (A Probability Programming Language) is presented that can be used to manipulate random variables and examples illustrate its use.
Phys
  • Rev. B 82, 115115
  • 2010
I and J
Dynamical mean-field theory of strongly correlated fermion systems and the limit of infinite dimensions
We review the dynamical mean-field theory of strongly correlated electron systems which is based on a mapping of lattice models onto quantum impurity models subject to a self-consistency condition.…
...
...