Regensburg 2016 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 78: Correlated Electrons: Poster Session
TT 78.34: Poster
Thursday, March 10, 2016, 15:00–18:30, Poster D
Phase diagram of negative-hopping Bose-Hubbard model on triangular lattice — •Shijie Hu1, Xuefeng Zhang2, Axel Pelster1, and Sebastian Eggert1 — 1Department of Physics and Research Center Optimas, Technical University Kaiserslautern, 67663 Kaiserslautern, Germany — 2Max Planck Institute for the Physics of Complex Systems Nöthnitzer Str. 38, 01187 Dresden, Germany
We study the phase diagram of the negative-hopping Bose-Hubbard model on the triangular lattice by using the parallel-tempering algorithm in the two-dimensional density matrix renormalization group (DMRG) method. For the integer-1 filling, we found a first-order transition from the chiral superfluild phase to the normal insulating phase where both U(1) and Z2 symmetry are spontaneously broken. Away from the integer-1 filling, we found a new phase corresponding to a kind of novel bond order. As the chemical potential increases, the negative-hopping Bose-Hubbard model undergoes two first-order transitions instead.