扩展玻色-哈伯德哈密顿量的量子相：光学晶格中冷原子超固体态的可能性。
Quantum phases of the extended Bose-Hubbard hamiltonian: possibility of a supersolid state of cold atoms in optical lattices.
作者信息
Scarola V W, Das Sarma S
机构信息
Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, MD 20742-4111, USA.
出版信息
Phys Rev Lett. 2005 Jul 15;95(3):033003. doi: 10.1103/PhysRevLett.95.033003.
Cold atom optical lattices typically simulate zero-range Hubbard models. We discuss the theoretical possibility of using excited states of optical lattices to generate extended range Hubbard models. We find that bosons confined to higher bands of optical lattices allow for a rich phase diagram, including the supersolid phase. Using Gutzwiller, mean-field theory we establish the parameter regime necessary to maintain metastable states generated by an extended Bose-Hubbard model.
冷原子光晶格通常用于模拟零程哈伯德模型。我们讨论了利用光晶格的激发态来生成扩展程哈伯德模型的理论可能性。我们发现，局限于光晶格较高能带的玻色子会呈现出丰富的相图，包括超固相。利用古兹维勒平均场理论，我们确定了维持由扩展玻色 - 哈伯德模型产生的亚稳态所需的参数范围。
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