Quantum correction to conductivity close to a ferromagnetic quantum critical point in two dimensions.
We study the temperature dependence of the conductivity due to quantum interference processes for a two-dimensional disordered itinerant electron system close to a ferromagnetic quantum critical point. Near the quantum critical point, the crossover between diffusive and ballistic regimes of quantum interference effects occurs at a temperature T*=1/taugamma(E(F)tau)2, where gamma is the parameter associated with the Landau damping of the spin fluctuations, tau is the impurity scattering time, and E(F) is the Fermi energy. For a generic choice of parameters, T* is smaller than the nominal crossover scale 1/tau. In the ballistic quantum critical regime, the conductivity behaves as T1/3.
Paul
I
I
SPhT, CEA-Saclay, L'Orme des Merisiers, 91191 Gif-sur-Yvette, France.
Pépin
C
C
Narozhny
B N
BN
Maslov
D L
DL