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
✍ Scribed by D. Waxman; K.D. Ivanovamoser
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 749 KB
- Volume
- 226
- Category
- Article
- ISSN
- 0003-4916
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✦ Synopsis
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 for such a system is calculated using the Bogoliubov Hamiltonian in which the quadratic momentum dependence of the kinetic energy is approximated by a linear dependence. A representation of the density of states in terms of a Fredholm determinant is derived. For the case of a piecewise constant order parameter, the Fredholm determinant is calculated exactly. Explicit results for the density of states are presented for an order parameter with a periodic variation along a single direction. 1993 Academic Press, lnc.