# Heidelberg 2015 – wissenschaftliches Programm

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# A: Fachverband Atomphysik

## A 15: Ultra-cold atoms, ions and BEC II (with Q)

### A 15.7: Vortrag

### Dienstag, 24. März 2015, 16:00–16:15, C/HSW

**Controlling a ***PT***-symmetric double well by an additional well** — •Daniel Haag, Dennis Dast, Holger Cartarius, and Günter Wunner — 1. Institut für Theoretische Physik, Universität Stuttgart

Non-Hermitian Hamiltonians provide an efficient way to describe in- and
outcoupling of atoms in Bose-Einstein condensates. Of special interest are
*PT*-symmetric Hamiltonians which often provide
*PT*-symmetric eigenstates with real eigenvalues. These
states are truly stationary even though the particles are removed
and injected at different locations. We implement such a Hamiltonian for a
three-mode system, where one additional well is coupled to a
*PT*-symmetric double well. The influences of the third well on the
well known behaviour of the two-well system is studied.