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Q: Fachverband Quantenoptik und Photonik

Q 9: Quantum gases (Bosons) I

Q 9.3: Vortrag

Montag, 9. März 2020, 14:45–15:00, e214

Floquet-Induced Superfluidity with Periodically Modulated Interactions of Two-Species Hardcore Bosons in a One-dimensional Optical Lattice — Tao Wang¹, Shijie Hu², Sebastian Eggert², Michael Fleischhauer², •Axel Pelster², and Xue-Feng Zhang³ — ¹Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, China — ²Physics Department and Research Center OPTIMAS, Technische Universität Kaiserslautern, Germany — ³Department of Physics, Chongqing University, China

We consider two species of hard-core bosons with density dependent hopping in a one-dimensional optical lattice, for which we propose experimental realizations using time-periodic driving. The quantum phase diagram for half-integer filling is determined by combining different advanced numerical simulations with analytic calculations. We find that a reduction of the density-dependent hopping induces a Mott-insulator to superfluid transition. For negative hopping a previously unknown state is found, where one species induces a gauge phase of the other species, which leads to a superfluid phase of gauge-paired particles. The corresponding experimental signatures are discussed.