22 citations · 132 across the 15 of their papers we have counts for
15 papers
Statistics and dynamics of the center of mass coordinate in a quantum liquid
Balázs Dóra, Balázs Hetényi, Catalin Pascu Moca
Motivated by recent experiments in ultracold gases, we focus on the properties of the center of mass coordinate of an interacting one dimensional Fermi gas, displaying several dist…
Current, conduction, and localization in quantum many-body systems
Balázs Hetényi
A representation of current is presented which can account for ideal conduction and distinguish superconductors, superfluids, ideal, and non-ideal conductors. The idea of the schem…
Drude weight, Meissner weight, rotational inertia of bosonic superfluids: how are they distinguished?
Balázs Hetényi
The Drude weight, the quantity which distinguishes metals from insulators, is proportional to the second derivative of the ground state energy with respect to a flux at zero flux.…
dc conductivity as a geometric phase
Balázs Hetényi
The zero frequency conductivity (), the criterion to distinguish between conductors and insulators is expressed in terms of a geometric phase. is also expressed using th…
Current Response in Extended Systems as a Geometric Phase: Application to Variational Wavefunctions
Balázs Hetényi
The linear response theory for current is investigated in a variational context. Expressions are derived for the Drude and superfluid weights for general variational wavefunctions.…
Drude and Superfluid Weights in Extended Systems: the Role of Discontinuities and -peaks in the One and Two-Body Momentum Densities
Balázs Hetényi
The question of conductivity is revisited. Using the total momentum shift operator to construct the perturbed many-body Hamiltonian and ground state wave function the second deriva…