2006/01/31 by K. Sengupta, Sergei V. Isakov, S. V. Isakov +1 · 2 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Cold Atom Physics and Bose-Einstein Condensates #Quantum, superfluid, helium dynamics #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.73.245103
published as Phys. Rev. B 73, 245103 (2006) · 10 pages, 8 figures, a few typos corrected
openalex publication_date 2006/06/07 · arxiv created 2006/07/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the superfluid-insulator transitions of bosons on the kagome lattice at incommensurate filling factors f=(1)/(2) and (2)/(3) using a duality analysis. We find that at f=(1)/(2) the bosons will always be in a superfluid phase and demonstrate that the T3 symmetry of the dual (dice) lattice, which results in dynamic localization of vortices due to the Aharonov-Bohm caging effect, is at the heart of this phenomenon. In contrast, for f=(2)/(3), we find that the bosons exhibit a quantum phase transition between superfluid and translational symmetry broken Mott insulating phases. We discuss the possible broken symmetries of the Mott phase and elaborate the theory of such a transition. Finally we map the boson system to a XXZ spin model in a magnetic field and discuss the properties of this spin model using the obtained results.