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Title: Berry curvature of interacting bosons in a honeycomb lattice
Authors: Li, Yun
Sengupta, Pinaki
Batrouni, George G.
Miniatura, Christian
Grémaud, Benoît
Keywords: Physics & Applied Physics
Issue Date: 2015
Source: Li, Y., Sengupta, P., Batrouni, G. G., Miniatura, C., & Grémaud, B. (2015). Berry curvature of interacting bosons in a honeycomb lattice. Physical Review A, 92(4), 043605-.
Series/Report no.: Physical Review A
Abstract: We consider soft-core bosons with on-site interaction loaded in the honeycomb lattice with different site energies for the two sublattices. Using both a mean-field approach and quantum Monte Carlo simulations, we show that the topology of the honeycomb lattice results in a nonvanishing Berry curvature for the band structure of the single-particle excitations of the system. This Berry curvature induces an anomalous Hall effect when driving the system out of equilibrium. It is seen by studying the time evolution of a wave packet, namely, a superfluid ground state in a harmonic trap, subjected either to a constant force (Bloch oscillations) or to a sudden shift of the trap center.
ISSN: 1050-2947
DOI: 10.1103/PhysRevA.92.043605
Schools: School of Physical and Mathematical Sciences 
Rights: © 2015 American Physical Society. This paper was published in Physical Review A and is made available as an electronic reprint (preprint) with permission of American Physical Society. The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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