Interacting electrons in disordered wires:: Anderson localization and low-T transport -: art. no. 206603

We study the conductivity sigma(T) of interacting electrons in a low-dimensional disordered system at low temperature T. For weak interactions, the weak-localization regime crosses over with lowering T into a dephasing-induced power-law hopping. As T is further decreased, the Anderson localization in Fock space crucially affects sigma(T), inducing a transition at T=T-c, so that sigma(T < T-c)=0. The critical behavior of sigma(T) above T-c is ln sigma(T)proportional to-(T-T-c)(-1/2). The mechanism of transport in the critical regime is many-particle transitions between distant states in Fock space.