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Supersolids versus phase separation in two-dimensional lattice bosons.
Pinaki Sengupta1, Leonid P Pryadko, Fabien Alet
1Department of Physics, University of California, Riverside, California 92521, USA.
Physical Review Letters
|August 11, 2005
Summary
Strong interactions in a boson Hubbard model create a stable supersolid ground state at specific densities. This finding is relevant for cold atomic systems in optical lattices.
Area of Science:
- Condensed matter physics
- Quantum many-body systems
Background:
- The two-dimensional extended boson Hubbard model describes interacting bosons on a lattice.
- Understanding the ground state phases is crucial for predicting material properties.
Purpose of the Study:
- Investigate the ground state properties of the 2D extended boson Hubbard model.
- Determine conditions for a stable supersolid phase.
Main Methods:
- Quantum Monte Carlo simulations
- Analysis of the two-dimensional extended boson Hubbard model on a square lattice
Main Results:
- A thermodynamically stable supersolid ground state emerges for densities greater than 1/2 when on-site interaction (U) and nearest-neighbor repulsion (V) are strong and comparable.
- The checkerboard supersolid is unstable towards phase separation at densities less than 1/2 or for very large U.
Conclusions:
- Finite, strong interactions (U and V) are key for stable supersolids.
- Results have implications for creating supersolid states with cold bosonic atoms in optical lattices.