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. 

Figures from this paper

Probing the Electron-Phonon Interaction in Correlated Electron Systems
One of the long-standing questions in cuprate physics concerns the role that the electron-phonon interaction plays across the phase diagram.
Ultrafast electric field controlled spin correlations in the Hubbard model
Highly intense electric field pulses can move the electronic momentum occupation in correlated metals over large portions of the Brillouin zone, leading to phenomena such as dynamic Bloch
Orbital Floquet engineering of exchange interactions in magnetic materials
We present a scheme to control the spin-exchange interactions by manipulating the orbital degrees of freedom using a periodic drive. We discuss two different protocols for orbital Floquet
Ultrafast reduction of exchange splitting in ferromagnetic nickel
TLDR
A time-dependent Liouville and density functional theory (TDLDFT) is proposed that integrates the time- dependentLiouville equation into thedensity functional theory and predicts a correct trend that agrees with the experiments.
X-ray scattering from light-driven spin fluctuations in a doped Mott insulator
Manipulating spin fluctuations with ultrafast laser pulses is a promising route to dynamically control collective phenomena in strongly correlated materials. However, understanding how photoexcited
Resonant Pumping of d-d Crystal Field Electronic Transitions as a Mechanism of Ultrafast Optical Control of the Exchange Interactions in Iron Oxides.
The microscopic origin of ultrafast modification of the ratio between the symmetric (J) and antisymmetric (D) exchange interaction in antiferromagnetic iron oxides is revealed, using femtosecond
Emergent ultrafast phenomena in correlated oxides and heterostructures
The possibility of investigating the dynamics of solids on timescales faster than the thermalization of the internal degrees of freedom has disclosed novel non-equilibrium phenomena that have no
Theory of photoinduced ultrafast switching to a spin-orbital ordered hidden phase
TLDR
This study theoretically confirms the crucial role played by orbital degrees of freedom in the light-induced dynamics of strongly correlated materials and it shows that the switching to hidden states can be controlled already on the fs timescale of the electron dynamics.
Theory of time-resolved Raman scattering in correlated systems: Ultrafast engineering of spin dynamics and detection of thermalization
Ultrafast characterization and control of many-body interactions and elementary excitations are critical to understanding and manipulating emergent phenomena in strongly correlated systems. In
Nonequilibrium DMFT
  • V. Turkowski
  • Dynamical Mean-Field Theory for Strongly Correlated Materials
  • 2021
...
...

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
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.
...
...