TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.12.5.167
TI  - Triplet character of 2D-fermion dimers arising from $s$-wave attraction via spin-orbit coupling and Zeeman splitting
PY  - 2022/05/19
UR  - https://scipost.org/SciPostPhys.12.5.167
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 12
IS  - 5
SP  - 167
A1  - Ebling, Ulrich
AU  - Zuelicke, Ulrich
AU  - Brand, Joachim
AB  - We theoretically study spin-$1/2$ fermions confined to two spatial dimensions and experiencing isotropic short-range attraction in the presence of both spin-orbit coupling and Zeeman spin splitting - a prototypical system for developing topological superfluidity in the many-body sector. Exact solutions for two-particle bound states are found to have a triplet contribution that dominates over the singlet part in an extended region of parameter space where the combined Zeeman- and center-of-mass-motion-induced spin-splitting energy is large. The triplet character of dimers is purest in the regime of weak $s$-wave interaction strength. Center-of-mass momentum is one of the parameters determining the existence of bound states, which we map out for both two- and one-dimensional types of spin-orbit coupling. Distinctive features emerging in the orbital part of the bound-state wave function, including but not limited to its $p$-wave character, provide observable signatures of unconventional pairing.
ER  -

@Article{10.21468/SciPostPhys.12.5.167,
	title={{Triplet character of 2D-fermion dimers arising from $s$-wave attraction via spin-orbit coupling and Zeeman splitting}},
	author={Ulrich Ebling and Ulrich Zülicke and Joachim Brand},
	journal={SciPost Phys.},
	volume={12},
	pages={167},
	year={2022},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.12.5.167},
	url={https://scipost.org/10.21468/SciPostPhys.12.5.167},
}