1212.4047 (Balázs Hetényi)

Zero frequency conductivity as a geometric phase    [PDF]

Balázs Hetényi

It is demonstrated that the zero frequency conductivity, or Drude weight, can be expressed in terms of a geometric phase. The resulting expression is then cast in terms of ground state expectation values over the total momentum shift and total position operators, leading to easy numerical access. The criterion for insulation is demonstrated to be the localization in the many-body configuration space relative to the localization of individual charge carriers.

View original: http://arxiv.org/abs/1212.4047