论文标题

由偶极相互作用引起的超氟相

Superfluid phases induced by the dipolar interactions

论文作者

Kraus, Rebecca, Biedroń, Krzysztof, Zakrzewski, Jakub, Morigi, Giovanna

论文摘要

我们确定了二极玻色子的量子基态在准二维光学晶格中,并通过$ s $波散射进行相互作用。哈密​​顿量是一种扩展的Bose-Hubbard模型,其中包括由于相互作用而跳跃术语。我们确定相互作用引起的跳跃术语的系数为负的参数制度。对于这些参数,我们通过数值确定规范集合的相图和密度矩阵重新归一化组。我们表明,在足够大的偶极强度值下,由于单粒子效应引起的隧道与相互作用引起的隧道之间存在量子干扰。由于这种现象,不可压缩的阶段出现在单粒子隧道速率的相对较大值下。该量子干扰将相图切成两个不同的断开超级流体相。特别是,在消失的动能下,该相始终是超氟,具有交错的超氟阶参数。这些动力学从量子波动和相互作用之间的量子干扰现象中浮现出来,并将其散发到确定量子物质的热力学特性中的作用。

We determine the quantum ground state of dipolar bosons in a quasi-one-dimensional optical lattice and interacting via $s$-wave scattering. The Hamiltonian is an extended Bose-Hubbard model which includes hopping terms due to the interactions. We identify the parameter regime for which the coefficients of the interaction-induced hopping terms become negative. For these parameters we numerically determine the phase diagram for a canonical ensemble and by means of density matrix renormalization group. We show that at sufficiently large values of the dipolar strength there is a quantum interference between the tunneling due to single-particle effects and the one due to the interactions. Because of this phenomenon, incompressible phases appear at relatively large values of the single-particle tunneling rates. This quantum interference cuts the phase diagram into two different, disconnected superfluid phases. In particular, at vanishing kinetic energy, the phase is always superfluid with a staggered superfluid order parameter. These dynamics emerge from quantum interference phenomena between quantum fluctuations and interactions and shed light into their role in determining the thermodynamic properties of quantum matter.

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