Rostock 2019 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 12: Ultra-cold atoms, ions and BEC
A 12.17: Poster
Dienstag, 12. März 2019, 16:30–18:30, S Fobau Physik
Rydberg-excited bosons in frustrated optical lattices: numerical study of quantum phases emerging due to the long-range interaction — •Jaromir Panas1, Andreas Geißler1,2, and Walter Hofstetter1 — 1Goethe-Universität, 60438 Frankfurt am Main, Germany — 2University of Strasbourg and CNRS, 67000 Strasbourg, France
Recent experiments with ultracold Rydberg-excited atoms have shown that long-range interactions can give rise to spatially ordered structures. Observation of such crystalline phases in a system with Rydberg atoms loaded into optical lattices is also within reach. Theoretical studies have been conducted for Rydberg-dressed bosons in a square lattice. A rich phase diagram has been obtained, with a series of supersolid and density wave phases characterized by different spatial orderings. Here we present results of equilibrium numerical calculations performed for long-range interacting bosons in a triangular lattice within state-of-the-art bosonic dynamical mean-field theory. We discuss differences between the frustrated and square lattice geometries. We also investigate a method of extending lifetime of the system, which is finite due to decay and dephasing inherent to the Rydberg excitations.