22 citations · 132 across the 15 of their papers we have counts for
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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…
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.…
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…
Approximate solution of variational wave functions for strongly correlated systems: Description of bound excitons in metals and insulators
Balazs Hetenyi
An approximate solution scheme, similar to the Gutzwiller approximation, is presented for the Baeriswyl and the Baeriswyl-Gutzwiller variational wavefunctions. The phase diagram of…
Many-body position operator in lattice fermionic systems with periodic boundary conditions
Balazs Hetenyi
A total position operator in the position representation is derived for lattice fermionic systems with periodic boundary conditions. The operator is shown to be Hermitian, the…