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Dimensional crossover on multileg attractive-U Hubbard ladders

Anastasia Potapova1, Ian Pilé1, Tian-Cheng Yi2, Rubem Mondaini2, and Evgeni Burovski1

  • 1HSE University, 101000 Moscow, Russia
  • 2Beijing Computational Science Research Center, Beijing 100084, China

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Phys. Rev. A 107, 053301 – Published 2 May, 2023

DOI: https://doi.org/10.1103/PhysRevA.107.053301

Abstract

We study the ground-state properties of a polarized two-component Fermi gas on multileg attractive-U Hubbard ladders. Using exact diagonalization and density-matrix renormalization-group-method simulations, we construct grand-canonical phase diagrams for ladder widths of up to W=5 and varying perpendicular geometries, characterizing the quasi-one-dimensional regime of the dimensional crossover. We unveil a multicritical point marking the onset of partial polarization in those phase diagrams, a candidate regime of finite-momentum pairing. We compare our findings with recent experimental and theoretical studies of quasi-one-dimensional polarized Fermi gases.

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Outline

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Phys. Rev. A 107, 053301– Published 2 May, 2023
  • Received 11 December 2022
  • Revised 9 April 2023
  • Accepted 10 April 2023
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