Lattice calculations for two-component fermion systems with unequal masses: onedimension

Authors

SERDAR ELHATISARI

Abstract

We consider systems of two-component fermions with unequal masses and interacting via a short-range attractive potential. We discuss the case where the two-component fermions form a shallow dimer with large scattering length. The three-fermion and four-fermion systems with such properties are universal and characterized by the twofermion scattering length aff and the ratio of the mass of spin-↑ fermion to the mass of spin-↓ fermion, m↑/m↓. In this study, using lattice effective field theory, we analyze fermion-dimer and dimer-dimer systems and calculate the universal fermion-dimer and dimer-dimer scattering lengths for various values of the mass ratio m↑/m↓. We find that these universal scattering lengths increase logarithmically with the mass ratio m↑/m↓.

DOI

10.3906/fiz-1805-17

Keywords

Lattice effective field theory, scattering phase shifts, universality

First Page

631

Last Page

640

Recommended Citation

ELHATISARI, SERDAR (2018) "Lattice calculations for two-component fermion systems with unequal masses: onedimension," Turkish Journal of Physics: Vol. 42: No. 6, Article 2. https://doi.org/10.3906/fiz-1805-17
Available at: https://journals.tubitak.gov.tr/physics/vol42/iss6/2