Universal Tetramer and Pentamer Bound States in Two-Dimensional Fermionic Mixtures,Physical Review Letters

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Universal Tetramer and Pentamer Bound States in Two-Dimensional Fermionic Mixtures
Physical Review Letters ( IF 8.1 ) Pub Date : 2022-08-12 , DOI: 10.1103/physrevlett.129.073401
Ruijin Liu ₁ , Cheng Peng _{1,

2} , Xiaoling Cui _{1,

3}

Affiliation

We study the emergence of universal tetramer and pentamer bound states in the two-dimensional (

N + 1

) system, which consists of

N

identical heavy fermions interacting with a light atom. We show that the critical heavy-light mass ratio to support a (

3 + 1

) tetramer below the trimer threshold is 3.38, and to support a (

4 + 1

) pentamer below the tetramer threshold is 5.14. While the ground state tetramer and pentamer are both with zero total angular momentum, they exhibit very different density distributions and correlations in momentum space, due to their distinct angular momentum decompositions in the dimer-fermion frame. These universal bound states can be accessible by a number of Fermi-Fermi mixtures now realized in cold atoms laboratories, which also suggest novel few-body correlations dominant in their corresponding many-body systems.

中文翻译：

二维费米子混合物中的通用四聚体和五聚体束缚态

我们研究了二维（

ñ + 1

) 系统，其中包括

ñ

相同的重费米子与轻原子相互作用。我们证明了支持 a (

3 + 1

) 低于三聚体阈值的四聚体为 3.38，并支持 (

4 + 1

) 低于四聚体阈值的五聚体为 5.14。虽然基态四聚体和五聚体的总角动量都为零，但由于它们在二聚体-费米子框架中的不同角动量分解，它们在动量空间中表现出非常不同的密度分布和相关性。这些普遍的束缚态可以通过现在在冷原子实验室中实现的许多费米-费米混合物来获得，这也表明新的少体相关性在其相应的多体系统中占主导地位。

更新日期：2022-08-12

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