Record Details

Title:
Nonequilibrium itinerant-electron magnetism: A time-dependent mean-field theory
Affiliation(s):
EuXFEL staff, Other
Author group:
Theory
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Topic:
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Abstract:
We study the dynamical magnetic susceptibility of a strongly correlated electronic system in the presence of a time-dependent hopping field, deriving a generalized Bethe-Salpeter equation that is valid also out of equilibrium. Focusing on the single-orbital Hubbard model within the time-dependent Hartree-Fock approximation, we solve the equation in the nonequilibrium adiabatic regime, obtaining a closed expression for the transverse magnetic susceptibility. From this, we provide a rigorous definition of nonequilibrium (time-dependent) magnon frequencies and exchange parameters, expressed in terms of nonequilibrium single-electron Green's functions and self-energies. In the particular case of equilibrium, we recover previously known results.
Imprint:
American Physical Society, 2016
Journal Information:
Physical Review B, 94 (8), 085153 (2016)
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Language(s):
English


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 Record created 2018-07-13, last modified 2018-12-19

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