80 citations · 335 across the 15 of their papers we have counts for
15 papers
Newton's identities and positivity of trace class integral operators
G. Homa, R. Balka, J. Z. Bernád +2
We provide a countable set of conditions based on elementary symmetric polynomials that are necessary and sufficient for a trace class integral operator to be positive semidefinite…
Range of applicability of the Hu-Paz-Zhang master equation
G. Homa, A. Csordás, M. A. Csirik +1
We investigate a case of the Hu-Paz-Zhang master equation of the Caldeira-Leggett model without Lindblad form obtained in the weak-coupling limit up to the second-order perturbatio…
Protected edge states in silicene antidots and dots in magnetic field
P. Rakyta, M. Vigh, A. Csordás +1
Silicene systems, due to the buckled structure of the lattice, manifest remarkable intrinsic spin-orbit interaction triggering a topological phase transition in the low-energy regi…
Calculation of the even-odd energy difference in superfluid Fermi systems using the pseudopotential theory
A. Csordás, G. Homa, P. Szépfalusy
The pseudopotential theory is extended to the Bogoliubov-de Gennes equations to determine the excess energy when one atom is added to the trapped superfluid Fermi system with even…
Gradient corrections to the local density approximation for trapped superfluid Fermi gases
András Csordás. Orsolya Almásy, Péter Szépfalusy
Two species superfluid Fermi gas is investigated on the BCS side up to the Feshbach resonance. Using the Greens's function technique gradient corrections are calculated to the gene…
Electronic and spin properties of Rashba billiards
József Cserti, András Csordás, Ulrich Zülicke
Ballistic electrons confined to a billiard and subject to spin--orbit coupling of the Rashba type are investigated, using both approximate semiclassical and exact quantum--mechanic…
Finite temperature hydrodynamic modes of trapped quantum gases
András Csordás, Robert Graham
The hydrodynamic equations of an ideal fluid formed by a dilute quantum gas in a parabolic trapping potential are studied analytically and numerically. Due to the appearance of int…
Collective excitations of degenerate Fermi gases in anisotropic parabolic traps
András Csordás, Robert Graham
The hydrodynamic low-frequency oscillations of highly degenerate Fermi gases trapped in anisotropic harmonic potentials are investigated. Despite the lack of an obvious spatial sym…
Shifts and widths of collective excitations in trapped Bose gases by the dielectric formalism
J. Reidl, A. Csordás, R. Graham +1
We present predictions for the temperature dependent shifts and damping rates. They are obtained by applying the dielectric formalism to a simple model of a trapped Bose gas. Withi…
Finite temperature excitations of Bose gases in anisotropic traps
J. Reidl, A. Csordás, R. Graham +1
The mode frequencies of a weakly interacting Bose gas in a magnetic trap are studied as a function of the anisotropy of the trap. As in earlier works the generalized Hartree-Fock-B…
Collective excitations in Bose-Einstein condensates in triaxially anisotropic parabolic traps
András Csordás, Robert Graham
The wave equation of low-frequency density waves in Bose-Einstein condensates at vanishing temperature in arbitrarily anisotropic harmonic traps is separable in elliptic coordinate…
Quasi-particle excitations and dynamical structure function of trapped Bose-condensates in the WKB approximation
András Csordás, Robert Graham, Péter Szépfalusy
The Bogoliubov equations of the quasi-particle excitations in a weakly interacting trapped Bose-condensate are solved in the WKB approximation in an isotropic harmonic trap, determ…
Classical quasi-particle dynamics in trapped Bose condensates
Martin Fliesser, András Csordás, Robert Graham +1
The dynamics of quasi-particles in repulsive Bose condensates in a harmonic trap is studied in the classical limit. In isotropic traps the classical motion is integrable and separa…
Hydrodynamic excitations of Bose condensates in anisotropic traps
Martin Fliesser, András Csordás, Péter Szépfalusy +1
The collective excitations of Bose condensates in anisotropic axially symmetric harmonic traps are investigated in the hydrodynamic and Thomas-Fermi limit. We identify an additiona…
Semiclassical wave functions and energy levels of Bose-condensed gases in spherically symmetric traps
Andr'as Csord'as, Robert Graham, P'eter Sz'epfalusy
The WKB-approximation for the Bogoliubov-equations of the quasi-particle excitations in Bose-gases with condensate is worked out in the case of spherically symmetric trap potential…