Volume 123, Number 1, July 2018
|Number of page(s)||6|
|Published online||10 August 2018|
Bosonic Haldane insulator in the presence of local disorder: A quantum Monte Carlo study
1 Department of Physics, National University of Singapore - Singapore 117551, Republic of Singapore
2 Department of Physics, Anhui Normal University - Wuhu 241000, PRC
Received: 20 March 2018
Accepted: 17 July 2018
The Haldane phase (HP) is a paradigmatic example of symmetry protected topological phase. We explore how the bosonic HP behaves in the presence of local disorder, employing quantum Monte Carlo simulations of an extended Bose-Hubbard model subject to uncorrelated, quenched disorders. We find that the HP is robust against a weak disorder and the non-local string order of HP exhibits a reentrant behavior. Besides, a direct transition between the HP and superfluid phase is uncovered. A significant part of the ground-state phase diagram is established for the model, unveiling the location of HP surrounded by Bose glass, charge-density-wave–like and superfluid phases. We also mention a possible experimental scheme with optical lattice emulator to realize the present findings.
PACS: 05.30.Jp – Boson systems / 37.10.Jk – Atoms in optical lattices / 02.70.Ss – Quantum Monte Carlo methods
© EPLA, 2018
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