The Spin Mass of an Electron Liquid
Abstract
We show that in order to calculate correctly the spin current carried by a quasiparticle in an electron liquid one must use an effective "spin mass" ms, that is larger than both the band mass, mb, which determines the charge current, and the quasiparticle effective mass m*, which determines the heat capacity. We present microscopic calculations of ms in a paramagnetic electron liquid in three and two dimensions, showing that the mass enhancement ms/mb can be a very significant effect.
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