Effect of gauge-field interaction on fermion transport in 2D: Hartree conductivity correction and dephasing

Details Effect of gauge-field interaction on fermion transport in 2D: Hartree conductivity correction and dephasing Effect of gauge-field interaction on fermion transport in 2D: Hartree conductivity correction and dephasing

2008-04-14

arxiv.org/abs/0804.2215v1

Phys. Rev. B 77, 235414 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

36 pages, 16 figures

Scientific paper

10.1103/PhysRevB.77.235414

We consider the quantum corrections to the conductivity of fermions interacting via a Chern-Simons gauge field, and concentrate on the Hartree-type contributions. The first-order Hartree approximation is only valid in the limit of weak coupling \lambda to the gauge field, and results in an antilocalizing conductivity correction, \sim \lambda^2 g \ln^2 T (g is the conductance). In the case of strong coupling, an infinite summation of higher-order terms is necessary, including both the virtual (renormalization) and real (dephasing) processes. At intermediate temperatures 1/g^2\tau<

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