Abstract
We derive a four-component Vlasov equation for a system composed of spin-1/2 fermions (typically electrons). The orbital part of the motion is classical, whereas the spin degrees of freedom are treated in a completely quantum-mechanical way. The corresponding hydrodynamic equations are derived by taking velocity moments of the phase-space distribution function. This hydrodynamic model is closed using a maximum entropy principle in the case of three or four constraints on the fluid moments, both for Maxwell-Boltzmann and Fermi-Dirac statistics.
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Contribution to the Topical Issue “Theory and Applications of the Vlasov Equation”, edited by Francesco Pegoraro, Francesco Califano, Giovanni Manfredi and Philip J. Morrison.
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Hurst, J., Morandi, O., Manfredi, G. et al. Semiclassical Vlasov and fluid models for an electron gas with spin effects. Eur. Phys. J. D 68, 176 (2014). https://doi.org/10.1140/epjd/e2014-50205-5
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DOI: https://doi.org/10.1140/epjd/e2014-50205-5