光晶格中Fermi-Fermi混合物的量子相位
Quantum phases of Fermi-Fermi mixtures in optical lattices
摘要：
分析了光晶格中Fermi-Fermi混合物的基态相图与相互作用强度、布居不平衡、填充率和隧穿参数的关系。结果表明，人口不平衡的费米-费米混合物减少到强相互作用的玻色-费米混合物的分子极限，在形成鲜明对比的均匀或谐波捕获系统，其中所产生的玻色-费米混合物是弱相互作用。此外，绝缘相被发现在光晶格的费米-费米混合物除了标准的相分离或共存的超流/过剩的费米子相发现在均匀的系统。绝缘态可以是分子玻色-莫特绝缘体（BMI）、费米-泡利绝缘体（FPI）、相分离的BMI/FPI混合物或玻色-费米棋盘（BFC）。
英文摘要：
The ground state phase diagram of Fermi-Fermi mixtures in optical lattices is analyzed as a function of interaction strength, population imbalance, filling fraction and tunneling parameters. It is shown that population imbalanced Fermi-Fermi mixtures reduce to strongly interacting Bose-Fermi mixtures in the molecular limit, in sharp contrast to homogeneous or harmonically trapped systems where the resulting Bose-Fermi mixture is weakly interacting. Furthermore, insulating phases are found in optical lattices of Fermi-Fermi mixtures in addition to the standard phase-separated or coexisting superfluid/excess fermion phases found in homogeneous systems. The insulating states can be a molecular Bose-Mott insulator (BMI), a Fermi-Pauli insulator (FPI), a phase-separated BMI/FPI mixture or a Bose-Fermi checkerboard (BFC).
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