Spin-independent effective mass in a valley-degenerate electron system

Details Spin-independent effective mass in a valley-degenerate electron system Spin-independent effective mass in a valley-degenerate electron system

2005-05-21

arxiv.org/abs/cond-mat/0505534v2

Phys. Rev. Lett. 95, 186801 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.95.186801

In a generic spin-polarized Fermi liquid, the masses of spin-up and spin-down electrons are expected to be different and to depend on the degree of polarization. This expectation is not confirmed by the experiments on two-dimensional heterostructures. We consider a model of an $N$-fold degenerate electron gas. It is shown that in the large-N limit, the mass is enhanced via a polaronic mechanism of emission/absorption of virtual plasmons. As plasmons are classical collective excitations, the resulting mass does not depend on $N$, and thus on polarization, to the leading order in 1/N. We evaluate the 1/N corrections and show that they are small even for N=2.

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