Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 38: Poster: Quantum Optics and Photonics I

Q 38.6: Poster

Dienstag, 6. März 2018, 16:15–18:15, Orangerie

Melting of Mott Lobes of Bosons in an Optical Lattice — •Martin Bonkhoff, Oliver Thomas, Axel Pelster, Herwig Ott, and Sebastian Eggert — Physics Department and Research Center OPTIMAS, Technische Universität Kaiserslautern, Erwin-Schrödinger Straße 46, 67663 Kaiserslautern, Germany

We investigate the finite-temperature properties of harmonically confined bosons in a 3d cubic optical lattice. At first we solve numerically exact the underlying Bose-Hubbard model in mean-field approximation, where we take into account the harmonic trapping confinement via the local density approximation. With this we obtain the quantum phase diagram as well as the particle and the entropy density, which reveal that the Mott lobes melt due to a delicate interplay of thermal fluctuations [1] and particle hopping. Finally, we compare the theoretical calculations for the resulting particle density with experimental measurements, which were obtained with a scanning electron microscope [2].

[1] F. Gerbier, Phys. Rev. Lett. 99, 120405 (2007)

[2] B. Santra and H. Ott, J. Phys. B 48, 122001 (2015)