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arXiv 1912.04598cond-mat.quant-gascond-mat.supr-conphysics.atm-clus
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双层超流玻色-费米混合体中的涌现力

Emergent force in a bilayer superfluid Bose-Fermi mixture

Mehmet Günay

摘要:

我们研究了混合维中的两个原子物种的系统,其中一个物种分布在三维空间中,另一个物种被限制在两个平行的层中。三维空间中原子的存在为那些被限制在层中的原子创造了一个感应电势。根据有效散射长度和层间距,已建议在同一层内形成p波配对或在不同层之间形成s波配对。结果表明,当时间反演对称性(TRS)存在时,这些对不能共存,随着层间距和有效散射长度之比的减小,出现了从p波到s波的跃迁。随着层间配对的形成,我们发现在临界点处存在一个涌现力,并表明它可以从热力学势导出。这一结果为实验上实现这种跃迁提供了一种工具,在量子热力学领域有着巨大的应用潜力。

英文摘要:

We investigate a system of two-atomic species in mixed dimensions, in which one species is spread in a three-dimensional space and the other species is confined in two parallel layers. The presence of atoms in 3-dimensions creates an induced potential for the ones confined in layers. Depending on the effective scattering length and the layer separation, the formation of p-wave pairing within the same layer or s-wave pairing between different layers has been suggested. It is shown that these pairs cannot coexist when time-reversal symmetry (TRS) is on, and there appears a transition from p-wave to s-wave as the ratio of the layer separation and the effective scattering length decreases. With the formation of the inter-layer pairing, we find an emergent force to be present at the critical point and show that it can be derived from the thermodynamic potential. This result offers a tool for experimentally realizing such transitions, and can find notable potential in the field of quantum-thermodynamics.

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