Polariton Laser in the Bardeen-Cooper-Schrieffer Regime

The Theory of Bardeen, Cooper, and Schrieffer

Cosmological Bardeen-Cooper-Schrieffer condensate as dark energy

Bardeen-Cooper-Schrieffer theory of finite-size superconducting metallic grains.

We study finite-size effects in superconducting metallic grains and determine the BCS order parameter and the low energy excitation spectrum in terms of the size and shape of the grain. Our approach combines the BCS self-consistency condition, a semiclassical expansion for the spectral density and interaction matrix elements, and corrections to the BCS mean field. In chaotic grains mesoscopic f...

The critical temperature and gap solution in the Bardeen-Cooper-Schrieffer theory of superconductivity

The paper studies the problem of numerical approximations of the critical transition temperature and the energy gap function in the Bardeen-CooperSchrieffer equation arising in superconductivity theory. The positive kernel function leads to a phonon dominant state at zero temperature. Much attention is given to the equation defined on a bounded region. Two discretized versions of the equation w...

Functional renormalization for the Bardeen-Cooper-Schrieffer to Bose-Einstein condensation crossover.

We review the functional renormalization group (RG) approach to the Bardeen-Cooper-Schrieffer to Bose-Einstein condensation (BCS-BEC) crossover for an ultracold gas of fermionic atoms. Formulated in terms of a scale-dependent effective action, the functional RG interpolates continuously between the atomic or molecular microphysics and the macroscopic physics on large length scales. We concentra...