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arXiv 0904.3097cond-mat.mes-hallcond-mat.quant-gas
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光晶格中玻色原子的复合费米子理论

Composite Fermion Theory for Bosonic Atoms in Optical Lattices

Gunnar Moller, Nigel R. Cooper

摘要:

我们研究了在均匀有效磁场中,用玻色-哈伯德模型描述的旋转光晶格上冷原子气体的基态。将玻色子映射到复合费米子导致了量子霍尔流体的预测,这种流体在连续介质中没有对应物。我们构建这些阶段的审判波函数,并进行数值测试的复合费米子模型的预测。我们的研究结果建立了强相关的相位超出了那些在连续极限的存在,并提供了证据的范围更广的复合费米子的方法超出其应用程序的最低朗道水平。

英文摘要:

We study the groundstates of cold atomic gases on rotating optical lattices, as described by the Bose-Hubbard model in a uniform effective magnetic field. Mapping the bosons to composite fermions leads to the prediction of quantum Hall fluids that have no counterpart in the continuum. We construct trial wavefunctions for these phases, and perform numerical tests of the predictions of the composite fermion model. Our results establish the existence of strongly correlated phases beyond those in the continuum limit, and provide evidence for a wider scope of the composite fermion approach beyond its application to the lowest Landau-level.

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