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Title: Frustration induced incommensurate solids in the extended Bose-Hubbard model
(Submitted on 18 Dec 2020 (v1), last revised 28 Mar 2021 (this version, v3))
Abstract: We study the extended Bose-Hubbard model with nearest-neighbor and next-nearest-neighbor $(V, V')$ repulsive interactions on a square lattice by using the quantum Monte Carlo method. Unlike the case of strong $V'$ where the ground states can be striped solids or striped supersolids, we focus on weak $V' < V/2$ and small hoppings and find that, in the thermodynamic limit, incommensurate solids of fractional densities varying from 1/4 to 1/2 can be stabilized. We also show that the incommensurate solids, which are characterized by a continuous set of wave vectors changing from $(\pi,\pi/2)$ (or $(\pi/2,\pi)$) to $(\pi,\pi)$, can be understood by a mechanism of domain wall formation. The related ground-state phase diagram and thermal phase transitions are also discussed.
Submission history
From: Kwai-Kong Ng [view email][v1] Fri, 18 Dec 2020 09:24:24 GMT (305kb,D)
[v2] Fri, 26 Feb 2021 02:37:30 GMT (308kb,D)
[v3] Sun, 28 Mar 2021 15:04:43 GMT (306kb,D)
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