Mainz 2026 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 26: Poster – Ultracold Matter (joint session Q/A)
A 26.8: Poster
Mittwoch, 4. März 2026, 17:00–19:00, Philo 2. OG
Phase diagrams for dipolar interacting quantum gases — •Robin Ruediger Krill1, Jan Alexander Koziol2, Anja Langheld2, Calvin Krämer2, Giovanna Morigi1, and Kai Phillip Schmidt2 — 1Theoretische Physik, Universität des Saarlandes, 66123 Saarbrücken, Germany — 2Department für Physik, Friedrich-Alexander Universität Erlangen-Nürnberg, Staudtstraße 7, 91058 Erlangen, Germany
We present phase diagrams for ultracold quantum gases of dipolar bosons in an optical lattice. In the low-density regime, we map the quantum gas to a hardcore-bosonic model, where we then can use an extended Stochastic Series Expansion quantum Monte Carlo algorithm to obtain the ground state phase diagrams. Recent investigations of such systems with mean-field approaches indicate rich quantum phase diagrams including a devil's staircase of solid phases and a plethora of exotic lattice supersolids [1]. The quantum Monte-Carlo approach allows us to extend this mean-field study by fully incorporating quantum fluctuations, and thus to analyse the interplay among frustration, long-range interactions, and quantum fluctuations. We determine the phase diagram and verify the existence of supersolid phases in the low-density limit.
[1] J.A Koziol, G.Morigi, K.P. Schmidt, SciPost Phys. 17, 111 (2024)
Keywords: Quantum Monte Carlo; Stochastic Series Expansion; Hardcore Bosons; Supersolid; dipolar quantum gases