Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 27: Poster: Quantum Optics and Photonics II
Q 27.16: Poster
Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof
Hard-Core Bosons in Lattices with Intermediate Geometries Between Quadratic and Triangular — •Mathias May1 and Axel Pelster2 — 1Physics Department, Freie Universität Berlin, Germany — 2Physics Department and Research Center OPTIMAS, Technische Universität Kaiserslautern, Germany
The extended Bose-Hubbard model has recently been realized on a quadratic lattice utilizing magnetic dipolar 168Er atoms [1]. This motivated us to perform a Gutzwiller mean-field analysis of hard-core bosons in two-dimensional lattices, which continuously interpolate between the non-frustrated quadratic and the frustrated triangular case [2,3]. In particular at negative hopping we find interesting new supersolid phases, which do not exist in either of these limiting cases and combine the checkerboard symmetry known from the quadratic lattice with the honeycomb pattern known from the triangular lattice. For instance, there is a supersolid phase, in which the phases of the condensate order parameters form a checkerboard pattern and at the same time the densities fulfill a honeycomb symmetry.
[1] S. Baier, M. J. Mark, D. Petter, K. Aikawa, L. Chomaz, Z. Cai, M. Baranov, P. Zoller, and F. Ferlaino, arXiv:1507.03500.
[2] D. Yamamoto, G. Marmorini, and I. Danshita, Phys. Rev. Lett. 112, 127203 (2014).
[3] D. Sellmann, X.-F. Zhang, and S. Eggert, Phys. Rev. B 91, 081104(R) (2015).