# Unconventional pairing in few-fermion systems tuned by external confinement

@article{Dobrzyniecki2021UnconventionalPI, title={Unconventional pairing in few-fermion systems tuned by external confinement}, author={Jacek Dobrzyniecki and Giuliano Orso and Tomasz Sowi'nski}, journal={Physical Review Research}, year={2021} }

We study the ground-state properties of a two-component one-dimensional system of a few ultracold fermions with attractive interactions. We show that, by ramping up an external potential barrier felt by one of the components, it is possible to induce regions of exotic superfluid phases, characterized by a tunable finite net momentum of the Cooper pair, without changing the overall spin populations. We show that these phases, which are the few-body analogs of the celebrated Fulde-Ferrell-Larkin…

## One Citation

### Unconventional pairing in few-fermion systems at finite temperature

- PhysicsScientific Reports
- 2022

Attractively interacting two-component mixtures of fermionic particles confined in a one-dimensional harmonic trap are investigated. Properties of balanced and imbalanced systems are systematically…

## References

SHOWING 1-10 OF 71 REFERENCES

### Signatures of unconventional pairing in spin-imbalanced one-dimensional few-fermion systems

- PhysicsPhysical Review Research
- 2020

A system of a few attractively interacting fermionic $^6$Li atoms in one-dimensional harmonic confinement is investigated. Non-trivial inter-particle correlations induced by interactions in a…

### Pairing in few-fermion systems with attractive interactions.

- PhysicsPhysical review letters
- 2013

From the tunneling time scales, this work infer the differences in interaction energies of systems with different number of particles, which show a strong odd-even effect, similar to the one observed for neutron separation experiments in nuclei.

### Unconventional pairing in one-dimensional systems of a few mass-imbalanced ultracold fermions

- PhysicsPhysical Review A
- 2020

We study the ground-state properties of a two-component fermionic mixture effectively confined in a one-dimensional harmonic trap. We consider scenarios when numbers of particles in components are…

### Pairing in a system of a few attractive fermions in a harmonic trap

- Physics
- 2015

We study a strongly attractive system of a few spin-(1/2) fermions confined in a one-dimensional harmonic trap, interacting via two-body contact potential. Performing exact diagonalization of the…

### π phases in balanced fermionic superfluids on spin-dependent optical lattices.

- PhysicsPhysical review letters
- 2010

A balanced two-component system of ultracold fermions in one dimension with attractive interactions and subject to a spin-dependent optical lattice potential of opposite sign, which is intrinsically stable to phase separation.

### Deterministic Preparation of a Tunable Few-Fermion System

- PhysicsScience
- 2011

This work has created a few-body quantum system with complete control over its quantum state using ultracold fermionic atoms in an optical dipole trap and has observed the interaction-induced energy shift for a pair of repulsively interacting atoms.

### Attractive Fermi gases with unequal spin populations in highly elongated traps.

- PhysicsPhysical review letters
- 2007

We investigate two-component attractive Fermi gases with imbalanced spin populations in trapped one-dimensional configurations. The ground state properties are determined with the local density…

### Few-body perspective on fermionic pairing in one spatial dimension

- PhysicsEPL (Europhysics Letters)
- 2021

In this perspective we discuss recent theoretical and experimental concepts giving a route to a better understanding of conventional and unconventional pairing mechanisms between opposite-spin…

### Exact numerical study of pair formation with imbalanced fermion populations.

- PhysicsPhysical review letters
- 2008

An exact quantum Monte Carlo study of the attractive one-dimensional Hubbard model with imbalanced fermion population with Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase, showing the minority and majority momentum distributions are shown to be deformed.

### BCS–BEC Crossover and Unconventional Superfluid Order in One Dimension

- Physics
- 2012

In this chapter we discuss the BCS–BEC crossover in one-dimensional Fermi gases. We present exact results using the Bethe Ansatz as well as numerical calculations of the correlation functions and the…