Eur. Phys. J. B (2021) 94: 191
https://doi.org/10.1140/epjb/s10051-021-00198-5

Regular Article - Solid State and Materials

Spin-imbalanced homogeneous atomic fermi gas in two dimensions

¹ Department of Physics, College of Science, Imam Mohammad Ibn Saud Islamic University, Riyadh, Saudi Arabia
² Department of Physics, Faculty of Science, The Hashemite University, Zarqa, Jordan

^a haalkhzon@imamu.edu.sa

Received: 8 June 2021
Accepted: 3 September 2021
Published online: 27 September 2021

Abstract

Two-dimensional spin-imbalanced homogeneous gas trapped in a hard box is studied within the static fluctuation approximation (SFA). The effects of temperature, tarp size, interaction strength $g_0$ and polarization on the thermodynamic properties are investigated. In the quantum regime, the energy U is found to be a parabolic function of T. The heat capacity and entropy increase with the width of the box indicating that these quantities are non-intensive quantities for finite size system, whereas the chemical potential $\mu$and U decrease as the box width increases. In addition, U increases linearly with $g_0$ in the repulsive interaction case and decreases as the magnitude of $g_0$ of attractive potential increases. The results are compared to those obtained within the Diffusion Monte Carlo method with Fixed Node approximation, the self-consistent fluctuation theory, the virial expansion, and other experimental results. Our results for $\mu$ are compared to the theoretical results obtained by the virial-expansion method for a gas in free space, as well as to the experimental results for a gas in a harmonic trap. We have found that the results depend on the type of trap.