Theory of a chiral Fermi liquid

Datum

29.07.2013

Zeit

15:00 - 16:00

Sprecher

Dmitrii Maslov

Zugehörigkeit

University of Florida

Sprache

en

Hauptthema

Physik

Andere Themen

Physik

Host

SPORE13

Beschreibung

We extend the Fermi-liquid (FL) theory to include spin-orbit (SO) splitting of the energy bands, focusing on the Rashba SO coupling as an example. We construct the phenomenological Landau interaction function for such a system using the symmetry arguments and verify this construction by an explicit perturbative calculation. The Landau function is used to obtain the effective mass, compressibility, and stability conditions of the FL. It is shown that although the charge-sector properties, such as the effective mass and compressibility, are determined solely by well-defined quasiparticles, the spin-sector properties, such as the spin susceptibility, contain a contribution from damped states in between the spin-split Fermi surfaces, and thus cannot be fully described by the FL theory, except for the case of weak SO coupling. We also show the chiral FLs support a new kind of collective modes--chiral spin waves--and propose an experiment in which they can be observed.

Letztmalig verändert: 29.07.2013, 09:52:45