a Coupled Angular Momentum Model for the Josephson Junction.
Abstract
A model for the Josephson junction is constructed based on two macroscopic angular momentum vectors. These vectors, which interact via a Heisenberglike Hamiltonian, are defined using Anderson's pseudospin concept in superconductivity. Along with this, a new state vector, which affords a more complete description of the constantchargeimbalance mode of the junction, is explicitly constructed. The resulting equations of motion lead directly to the basic Josephson results and at the same time provide a simple physical picture for the dynamical behavior of the junction. Both the Anderson (n,(phi)) and Feynman twostate models of the junction are shown to be equivalent to a restricted form of the angular momentum approach. The process of formulating the junction problem in terms of pseudoangularmomentum together with the above identification constitutes a microscopic derivation of the Feynman method. A perturbation theory calculation is carried out within the full pseudoangular momentum equations of motion to determine how this approach differs from the earlier ones.
 Publication:

Ph.D. Thesis
 Pub Date:
 March 1982
 Bibcode:
 1982PhDT........56D
 Keywords:

 Physics: Condensed Matter