Quantum phase diagram of fermion mixtures with population imbalance in one-dimensional optical lattices
Quantum phase diagram of fermion mixtures with population imbalance in one-dimensional optical lattices
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DOI：
10.1103/physreva.79.051604
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发表时间：
2009-01
影响因子：
2.9
通讯作者：
Bin Wang;Han-dong Chen;S. D. Sarma
中科院分区：
文献类型：
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作者：
Bin Wang;Han-dong Chen;S. D. Sarma
利用最近发展的时间演化分块抽取算法，数值研究了一维光晶格中具有种间吸引相互作用的费米混合体系的基态量子相图.在我们的研究中，我们采用了一个一般的非对称哈伯德模型与物种依赖的隧道速率，将混合物中的质量不平衡的可能性。我们发现在人口不平衡的存在下，在这个模型中的Fulde-Ferrell-Larkin-Ovchinnikov（FFLO）阶段的存在明确的签名。我们的模拟还表明，在质量不平衡的存在下，FFLO状态的参数空间收缩，甚至完全消失，这取决于吸引相互作用的强度和质量不平衡的程度。
With a recently developed time-evolving block decimation algorithm, we numerically study the ground-state quantum phase diagram of Fermi mixtures with attractive interspecies interactions loaded in one-dimensional optical lattices. For our study, we adopt a general asymmetric Hubbard model with species-dependent tunneling rates to incorporate the possibility of mass imbalance in the mixtures. We find clear signatures for the existence of a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase in this model in the presence of population imbalance. Our simulation also reveals that in the presence of mass imbalance, the parameter space for FFLO states shrinks or even completely vanishes depending on the strength of the attractive interaction and the degree of mass imbalance.