131 citations · 1.5k across the 69 of their papers we have counts for
8 papers · 2 filters
Coupling approach for the realization of a -symmetric potential for a Bose-Einstein condensate in a double well
Fabian Single, Holger Cartarius, Günter Wunner +1
We show how non-Hermitian potentials used to describe probability gain and loss in effective theories of open quantum systems can be achieved by a coupling of the system to an envi…
Supersymmetric model of a Bose-Einstein condensate in a -symmetric double-delta trap
Nikolas Abt, Holger Cartarius, Günter Wunner
The most important properties of a Bose-Einstein condensate subject to balanced gain and loss can be modelled by a Gross-Pitaevskii equation with an external -symmetr…
Quantum master equation with balanced gain and loss
Dennis Dast, Daniel Haag, Holger Cartarius +1
We present a quantum master equation describing a Bose-Einstein condensate with particle loss on one lattice site and particle gain on the other lattice site whose mean-field limit…
Realizing PT-symmetric non-Hermiticity with ultra-cold atoms and Hermitian multi-well potentials
Manuel Kreibich, Jörg Main, Holger Cartarius +1
We discuss the possibility of realizing a non-Hermitian, i.e. an open two-well system of ultra-cold atoms by enclosing it with additional time-dependent wells that serve as particl…
Fano-Feshbach resonances in two-channel scattering around exceptional points
W D Heiss, G Wunner
It is well known that in open quantum systems resonances can coalesce at an exceptional point, where both the energies {\em and} the wave functions coincide. In contrast to the usu…
Dipolar Bose-Einstein condensates in a PT-symmetric double-well potential
Rüdiger Fortanier, Dennis Dast, Daniel Haag +4
We investigate dipolar Bose-Einstein condensates in a complex external double-well potential that features a combined parity and time-reversal symmetry. On the basis of the Gross-P…
A Bose-Einstein Condensate with -Symmetric Double-Delta Function Loss and Gain in a Harmonic Trap: A Test of Rigorous Estimates
Daniel Haag, Holger Cartarius, Günter Wunner
We consider the linear and nonlinear Schrödinger equation for a Bose-Einstein condensate in a harmonic trap with -symmetric double-delta function loss and gain terms. We…
Stability of Bose-Einstein condensates in a symmetric double- potential close to branch points
Andreas Löhle, Holger Cartarius, Daniel Haag +3
A Bose-Einstein condensate trapped in a double-well potential, where atoms are incoupled to one side and extracted from the other, can in the mean-field limit be described by the n…