Universal Tetramer and Pentamer Bound States in Two-Dimensional Fermionic Mixtures

Ruijin Liu, Cheng Peng, and Xiaoling Cui
Phys. Rev. Lett. 129, 073401 – Published 12 August 2022

Abstract

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.

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  • Received 13 February 2022
  • Revised 3 May 2022
  • Accepted 18 July 2022

DOI:https://doi.org/10.1103/PhysRevLett.129.073401

© 2022 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Ruijin Liu1, Cheng Peng1,2, and Xiaoling Cui1,3,*

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • 3Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China

  • *xlcui@iphy.ac.cn

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Issue

Vol. 129, Iss. 7 — 12 August 2022

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