𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Superfluid density in the BCS–BEC crossover regime of a Fermi superfluid

✍ Scribed by Y. Ohashi; N. Fukushima; H. Matsumoto; E. Taylor; A. Griffin

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
183 KB
Volume
468
Category
Article
ISSN
0921-4534

No coin nor oath required. For personal study only.

✦ Synopsis

We investigate the superfluid carrier density q s in the BCS-BEC crossover regime of a Fermi superfluid at finite temperatures. Including pairing fluctuations within a Gaussian approximation, we calculate the superfluid order parameter, chemical potential, and q s in a consistent manner in the whole BCS-BEC crossover region. In the weak-coupling BCS regime, the temperature dependence of q s is dominated by single-particle excitations accompanied by thermal dissociation of Cooper pairs. In the strong-coupling BEC regime, we show that single-particle excitations become less dominant and thermal excitations of collective Bogoliubov mode become important for q s . We clarify how the weak-coupling BCS result smoothly changes into the strong-coupling BEC result, as one increases the strength of a pairing interaction.

📜 SIMILAR VOLUMES

Excitations in the BCS–BEC crossover reg
Excitations in the BCS–BEC crossover regime of a superfluid Fermi gas with a Feshbach resonance
✍ Yoji Ohashi 📂 Article 📅 2006 🏛 Elsevier Science 🌐 English ⚖ 243 KB

We investigate single-particle excitations at T = 0 in the BCS-BEC crossover regime of a superfluid Fermi gas. We solve the Bogoliubov-de Gennes equations in a trap, including a tunable pairing interaction associated with a Feshbach resonance. We show that the single-particle energy gap E g is domin

The Density of States for Fermi Superflu
The Density of States for Fermi Superfluids with Layered Structures in the Order Parameter: With Application to a Solution 3He in 4He at Low Temperatures
✍ D. Waxman; K.D. Ivanovamoser 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 749 KB

The density of states of Fermionic excitations in \(s\)-wave Fermi superfluids is calculated. The order parameter is assumed to have a layered structure with a variation along only a single direction and the Fermions are allowed to move over the full three-dimensional space. The density of states fo

Temperature dependence of superfluid den
Temperature dependence of superfluid density in YBa2Cu3O7−δ and Y0.7Ca0.3Ba2Cu3O7−δ thin films: A doping dependence study of the linear slope
✍ L.S. Lai; J.Y. Juang; K.H. Wu; T.M. Uen; Y.S. Gou 📂 Article 📅 2005 🏛 Elsevier Science 🌐 English ⚖ 138 KB

By using a microstrip ring resonator to measure the temperature dependence of the in-plane magnetic penetration depth k(T) in YBa 2 Cu 3 O 7Àd (YBCO) and Y 0.7 Ca 0.3 Ba 2 Cu 3 O 7Àd (Ca-YBCO) epitaxially grown thin films, the linear temperature dependence of the superfluid density q s /m \* 1/k 2 (