title: Spin dynamics from majorana fermions.
abstract: Using the Majorana fermion representation of spin-1/2 local moments, we show how the dynamic spin correlation and susceptibility are obtained directly from the one-particle Majorana propagator. We illustrate our method by applying it to the spin dynamics of a nonequilibrium quantum dot, computing the voltage-dependent spin relaxation rate and showing that, at weak coupling, the fluctuation-dissipation relation for the spin of a quantum dot is voltage dependent. We confirm the voltage-dependent Curie susceptibility recently found by Parcollet and Hooley [Phys. Rev. B 66, 085315 (2002)]].
authors.affiliation: Department of Physics and Astronomy, University of Stony Brook, SUNY, Stony Brook, New York 11794-3800, USA.
authors.forename: W
authors.initials: W
authors.lastname: Mao
authors.forename: P
authors.initials: P
authors.lastname: Coleman
authors.forename: C
authors.initials: C
authors.lastname: Hooley
authors.forename: D
authors.initials: D
authors.lastname: Langreth