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• W2912887072 abstract "Gauge-invariant Wigner theories are formulated in terms of the kinetic momentum, which---being a physical quantity---is conserved after a change of the gauge. These theories rely on a transform of the density matrix, originally introduced by Stratonovich, which generalizes the Weyl transform by involving the vector potential. We thus present an alternative derivation of the Weyl-Stratonovich transform, which bridges the concepts and notions used by the different, available gauge-invariant approaches and thus links physically intuitive with formal mathematical viewpoints. Furthermore, an explicit form of the Wigner equation, suitable for numerical analysis and corresponding to general, inhomogeneous, and time-dependent electromagnetic conditions, is obtained. For a constant magnetic field, the equation reduces to two models: in the case of a constant electric field, this is the ballistic Boltzmann equation, where classical particles are driven by local forces. The second model, derived for general electrostatic conditions, involves novel physics, where the magnetic field acts locally via the Liouville operator, while the electrostatics is determined by the manifestly nonlocal Wigner potential. A significant consequence of our work is the fact that now the constant magnetic field case can be treated with existing numerical approaches developed for the standard, scalar potential Wigner theory. Therefore, in order to demonstrate the feasibility of the approach, a stochastic method is applied to simulate a physically intuitive evolution problem." @default.
• W2912887072 created "2019-02-21" @default.
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• W2912887072 date "2019-01-22" @default.
• W2912887072 modified "2023-09-26" @default.
• W2912887072 title "Wigner equation for general electromagnetic fields: The Weyl-Stratonovich transform" @default.
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• W2912887072 doi "https://doi.org/10.1103/physrevb.99.014423" @default.
• W2912887072 hasPublicationYear "2019" @default.
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