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- Dennis Dast, Daniel Haag, Holger Cartarius, Jörg Main, G. Wunner
- 2013

We study a Bose-Einstein condensate in a PT -symmetric double-well potential where particles are coherently injected in one well and removed from the other well. In mean-field approximation the… (More)

Amplifying on a proposal by O’Dell et al. for the realization of Bose-Einstein condensates of neutral atoms with attractive 1/r interaction, we point out that the instance of self-trapping of the… (More)

- Holger Cartarius, Tomaž Fab, Jörg Main, G. Wunner, Holger. Cartarius
- 2008

The time-dependent extended Gross-Pitaevskii equation for Bose-Einstein condensates with attractive 1 /r interaction is investigated with both a variational approach and numerically exact… (More)

We analyze scattering cross sections at and near third-order exceptional points (EP3), i.e., points in physical parameter space where three energies and eigenfunctions coincide. At an EP3, the… (More)

- Dennis Dast, Daniel Haag, Holger Cartarius, G. Wunner
- 2014

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 is a nonHermitian… (More)

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 environment. We do this… (More)

The quantitative analysis of the electromagnetic spectra of isolated neutron stars by means of model atmosphere calculations requires extensive data sets of atomic energy values and transition… (More)

- Robin Gutöhrlein, Jan Eike Schnabel, Ibrokhim Iskandarov, Holger Cartarius, Jörg Main, G. Wunner
- 2015

In open double-well Bose-Einstein condensate systems which balance inand outfluxes of atoms and which are effectively described by a non-hermitian PT -symmetric Hamiltonian PT -symmetric states have… (More)

- Tomaž Fabčič, Jörg Main, G. Wunner
- The Journal of chemical physics
- 2008

The dynamics of quantum systems can be approximated by the time propagation of Gaussian wave packets. Applying a time dependent variational principle, the time evolution of the parameters of the… (More)

We apply a variational technique to solve the time-dependent Gross–Pitaevskii equation for Bose–Einstein condensates in which an additional dipole–dipole interaction between the atoms is present with… (More)