28.11.2011. :: Seminar Laboratorije za gasnu elektroniku - Zoran Ristivojevic
LABORATORIJA ZA GASNU ELEKTRONIKU
"Interacting electrons in one dimension beyond the Luttinger liquid paradigm: relaxation rates and transport"
dr Zoran Ristivojevic
Laboratoire de physique théorique, Ecole Normale Supérieure Paris, France
koji će se održati u ponedeljak 28. novembra 2011. godine u sali 10 Instituta za fiziku sa početkom u 11 sati
In contrast to higher dimensional systems where pair collisions provide finite relaxation rate and lifetime, the situation in one dimension is peculiar. A one-dimensional electron gas requires three-particle collisions for finite relaxation due to constraints imposed by the conservation laws. At zero temperature the fastest relaxation is provided by the interbranch processes which enable energy exchange between counterpropagating particles. At sufficiently high temperatures the leading mechanism is due to the intrabranch scattering of comoving electrons. We derive the corresponding relaxation rates that strongly depend whether one considers screened or unscreened Coulomb interaction. The above mentioned relaxation processes are responsible for interaction-induced modifications of electrical and thermal conductance in quantum wires. Our approach is based on the Boltzmann equation that is beyond the Luttinger-liquid theory.