Spin dynamics from majorana fermions.
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)]].
Mao
W
W
Department of Physics and Astronomy, University of Stony Brook, SUNY, Stony Brook, New York 11794-3800, USA.
Coleman
P
P
Hooley
C
C
Langreth
D
D