一维偶极玻色气体中的魔鬼阶梯和超固体
Devil's staircases and supersolids in a one-dimensional dipolar Bose gas
摘要：
我们考虑一个单组分气体的偶极玻色子限制在一个一维的光晶格，其中的偶极子是对齐的，使得长程偶极相互作用是最大的排斥。在零站点间跳跃和足够大的现场相互作用的限制，相图是一个完整的魔鬼的阶梯填充分数在0和1之间，其中每个相称的状态在一个合理的填充是稳定的，在一个有限的间隔在化学势。我们扰动远离这个限制在两个实验动机的方向，涉及到增加跳跃和减少现场相互作用。除了跳跃单独产生一个相图，我们计算在微扰理论中的跳跃，相称的莫特阶段现在竞争的超流体。进一步软化的现场相互作用产生替代相称的状态与双占领，可以形成自己的楼梯，以及一维的“超固体”，同时表现出离散的对称性破缺和超流性。
英文摘要：
We consider a single-component gas of dipolar bosons confined in a one-dimensional optical lattice, where the dipoles are aligned such that the long-ranged dipolar interactions are maximally repulsive. In the limit of zero inter-site hopping and sufficiently large on-site interaction, the phase diagram is a complete devil's staircase for filling fractions between 0 and 1, wherein every commensurate state at a rational filling is stable over a finite interval in chemical potential. We perturb away from this limit in two experimentally motivated directions involving the addition of hopping and a reduction of the onsite interaction. The addition of hopping alone yields a phase diagram, which we compute in perturbation theory in the hopping, where the commensurate Mott phases now compete with the superfluid. Further softening of the onsite interaction yields alternative commensurate states with double occupancies which can form a staircase of their own, as well as one-dimensional "supersolids" which simultaneously exhibit discrete broken symmetries and superfluidity.
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