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TT: Fachverband Tiefe Temperaturen
TT 95: Cold Atomic Gases, Superfluids, Quantum Fluids and Solids
TT 95.4: Talk
Thursday, March 15, 2018, 15:45–16:00, HFT-FT 131
Manipulating the Mott lobes: optical lattice bosons coupled to atomic quantum dots — •Anna Posazhennikova1 and Florian M. Dobler2 — 1Royal Holloway University of London, Egham, UK — 2Universitaet Konstanz, Konstanz, Germany
We analyse quantum phase transitions in a system of optical lattice bosons coupled to an array of atomic quantum dots. The difference to Bose-Hubbard model is in that direct tunnelling between the lattice sites is prohibited and instead there is an assisted tunnelling via the quantum dots. We calculate the phase diagram of the combined system within the Gutzwiller-Ansatz. It turns out that the superfluid-Mott transition is still present in the system, however, the Mott lobes strongly depend on the system parameters. One can, for example, even reverse the usual hierarchy of the lobes with the first lobe becoming the smallest. We discuss the physics of the combined system in detail and overview possible applications of the model.