Balance and Imbalance p-wave superfluid in BCS-BEC crossover regime at finite temperature: Feynman Path Integral approach
| Autor: | G.D. Kemlekeu, J.T. Diffo, Lukong Cornelius Fai, M.G. Akumbom, M.E. Ateuafack, V.B. Mborong |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Coupling
Physics Condensed Matter::Quantum Gases BCS-BEC crossover Condensate fraction Partition function (statistical mechanics) education.field_of_study Phase transition Imbalance(balance) p-wave QC1-999 Population General Physics and Astronomy Superfluids Thermodynamic potential Superfluidity Pairing Quantum electrodynamics Path integral formulation education |
| Zdroj: | Results in Physics, Vol 30, Iss, Pp 104888-(2021) |
| ISSN: | 2211-3797 |
| Popis: | The effect of population imbalance in p-wave superfluids in the BCS-BEC crossover regime at finite temperatures is studied through the path integral formalism. Using the Hubbard–Stratonovich transformation, the partition function of the system is cast from quaternary to quadratic fields and the thermodynamic potential in the Saddle-point approximation in presence of fluctuation is derived. Similarly, the probability of condensation, the normal and superfluid densities are calculated and we find that in the weak coupling regime, the population imbalance is not favorable to superfluid density. Also, it is shown that in the presence of the population imbalance, the condensate fraction exhibits a phase transition and that from a certain value of the temperature the system deviates robustly against the population imbalance for p-wave pairing and that when one approaches the strong coupling, the atoms are strongly correlated and the configuration of the system is forbidden for a certain value of the coupling and tends to merge into evidence that the system is robust against population imbalance as one moves away from the strong coupling regime. Finally, we observed that the chemical potential increases with the population imbalance as we get closer to the strong coupling regime. |
| Databáze: | OpenAIRE |
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