二维光晶格中冷极性分子的量子相位
Quantum Phases of Cold Polar Molecules in 2D Optical Lattices
摘要：
本文讨论了二维正方晶格上通过排斥偶极-偶极相互作用的硬核玻色子的量子相位，这是可以用囚禁在光晶格中的极性分子实现的。在小隧道的限制，我们找到了一个魔鬼的楼梯，在那里出现的固体相在所有合理的填充底层晶格的证据。对于有限的隧道，我们建立的扩展区域的参数的存在，基态是一个超固体，通过掺杂的固体颗粒或空位。在这里，固体-超流的量子熔化跃迁由两个连续的二级跃迁组成，其中超固体作为中间相。讨论了与实验有关的有限温度和限制势的影响。
英文摘要：
We discuss the quantum phases of hard-core bosons on a two-dimensional square lattice interacting via repulsive dipole-dipole interactions, as realizable with polar molecules trapped in optical lattices. In the limit of small tunneling, we find evidence for a devil's staircase, where solid phases appear at all rational fillings of the underlying lattice. For finite tunneling, we establish the existence of extended regions of parameters where the groundstate is a supersolid, obtained by doping the solids either with particles or vacancies. Here the solid-superfluid quantum melting transition consists of two consecutive second-order transitions, with a supersolid as the intermediate phase. The effects of finite temperature and confining potentials relevant to experiments are discussed.
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