Eur. Phys. J. D 49, 383-390 (2008)
https://doi.org/10.1140/epjd/e2008-00169-0

Pairing in spin polarized two-species fermionic mixtures with mass asymmetry

¹ Theoretical Physics Division, Physical Research Laboratory, Navrangpura, 380009 Ahmedabad, India
² Department of Physics, Indian Institute of Technology, 110016 New Delhi, India

Corresponding author: ^a angom@prl.res.in

Received: 16 May 2008
Revised: 29 July 2008
Published online: 3 September 2008

Abstract

We discuss on the pairing mechanism of fermions with mismatch in their Fermi momenta due to a mass asymmetry. Using a variational ansatz for the ground state we also discuss the BCS-BEC crossover of this system. It is shown that the breached pairing solution with a single Fermi surface is stable in the BEC regime. We also include the temperatures effect on the fermion pairing within an approximation that is valid for temperatures much below the critical temperature.