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Published on: October 24, 2017
Quarter-filled supersolid and solid phases in the extended Bose-Hubbard model
Kwai-Kong Ng1, Y C Chen, Y C Tzeng
1Department of Physics, Tunghai University, Taichung 40704, Taiwan.
Summary
We numerically studied the Bose-Hubbard model, finding a stable supersolid phase. Competition between solid phases leads to a first-order phase transition, revealing key insights into quantum materials.
Area of Science:
- Condensed Matter Physics
- Quantum Many-Body Systems
Background:
- The two-dimensional hard-core Bose-Hubbard model describes interacting bosons on a lattice.
- Understanding its phase diagram is crucial for designing quantum devices.
Purpose of the Study:
- Investigate the ground state phase diagram of the Bose-Hubbard model with nearest- and next-nearest-neighbor interactions.
- Identify and characterize supersolid and solid phases at quarter filling.
Main Methods:
- Numerical simulations using canonical and grand canonical quantum Monte Carlo (QMC) methods.
- Complementary analysis with mean-field calculations.
Main Results:
- Evidence for a commensurate supersolid phase.
- Identification of two distinct solid phases and one stable supersolid phase.
- Observation of a first-order phase transition between solid phases driven by interaction parameters (2V(2) ~ V(1)).
Conclusions:
- The study confirms the existence of a stable supersolid phase in the investigated model.
- The competition between different ordering tendencies dictates the phase transitions.
- Detailed characterization of phase transitions and order parameter behavior provides valuable data for quantum simulations.
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