131 citations · 1.5k across the 69 of their papers we have counts for
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Verification of exceptional points in the collapse dynamics of Bose-Einstein condensates
Jonas Brinker, Jacob Fuchs, Jörg Main +2
In Bose-Einstein condensates with an attractive contact interaction the stable ground state and an unstable excited state emerge in a tangent bifurcation at a critical value of the…
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…
Construction of Darboux coordinates in noncanonical Hamiltonian systems via normal form expansions
Andrej Junginger, Jörg Main, Günter Wunner
Darboux's theorem guarantees the existence of local canonical coordinates on symplectic manifolds under certain conditions. We demonstrate a general method to construct such Darbou…
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…