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TT: Tiefe Temperaturen

TT 16: Solids At Low Temperature: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ...

TT 16.2: Vortrag

Dienstag, 28. März 2006, 09:45–10:00, HSZ 105

Supersolid Bosons on the Triangular Lattice — •Stefan Wessel¹ and Matthias Troyer² — ¹Institut für Theoretische Physik III, Universität Stuttgart, 70550 Stuttgart, Germany — ²Theoretische Physik, ETH Zürich, CH-8093 Zürich, Switzerland

The zero temperature phase diagram of hardcore bosons on the triangular lattice with nearest neighbor repulsion is determined using quantum Monte Carlo simulations. The system exhibits an extended supersolid phase emerging from an order-by-disorder effect as a novel way of a quantum system to avoid classical frustration. We analyze the nature of the supersolid phase and its stability in competition with phase-separation, which we find to occurs in other regions of parameter space.