SAMOP 2023 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 22: Poster II

Q 22.10: Poster

Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof

Vortex splitting, not stirring — •Lars Arne Schäfer — Institut für angewandte Physik, Technische Universität Darmstadt, Hochschulstraße 4A, D-64289 Darmstadt

We examine Bose-Hubbard ring systems in two dimensional configurable arrays of dipole potentials [1]. This is an example for an atomtronics device [2]. Here, an individual small ring with few sites and few particles acts like an artificial atom with a clearly resolved spectrum. We analyze the single-particle spectrum in terms of eigenfunctions of the Hamiltonian operator as well as the discrete translational symmetry of the 1-D lattice. Coupling two or more of such systems creates a quantum network.

It is experimentally feasible to create controllable time-dependent on-site optical potentials by means of electronic wavefront manipulation (DMD, SLD) and microlens arrays. In contrast to phase imprinting, we study two counter-propagating lattice potentials to create persistent currents or vortices of few bosons. This is in analogy to Bragg matter-wave splitters for linear momentum states [3]. Finally, we study the efficiency for pulsed splitting of many-body states into vortex-anti-vortex pairs.
[1] M. R. Sturm et al., Phys. Rev. A, 95, 063625 (2017)
[2] R. Dumke et al., J. Opt., 18, 093001 (2016)
[3] A. Neumann, M. Gebbe, and R. Walser, Phys. Rev. A, 103, 043306 (2021)