ar X iv : c on d - m at / 9 50 10 40 v 1 1 1 Ja n 19 95 Coherent States of Alternating Current . ( February 1 , 2008 )

ar X iv : c on d - m at / 9 40 10 66 v 1 2 8 Ja n 19 94 Ground state energy and quasiparticle gaps

ar X iv : c on d - m at / 9 40 10 05 v 2 1 0 Ja n 19 94 Composite operators for BCS Superconductor

The new form of the composite operator generalizing the Cooper pairs for a BCS superconductor is introduced. The approach is similar to the derivation of the composite operator of the odd-frequency superconductors. The examples of the d x 2 −y 2 −, d xy − and p− wave composite operators for a 2D t − J model are given.

ar X iv : c on d - m at / 9 60 10 85 v 1 1 9 Ja n 19 96 Coherent Charge Transport in Superconductor – Normal Metal Proximity Structures

We develop a detailed analysis of electron transport in normal diffusive conductors in the presence of proximity induced superconducting correlation. We calculated the linear conductance of the system and the profile of the electric field. A rich structure of temperature dependences was found and explained. Our results are consistent with recent experimental findings.

ar X iv : q - a lg / 9 50 10 12 v 1 1 2 Ja n 19 95 REPRESENTATIONS OF GENERALIZED OSCILLATOR ALGEBRA

The representations of the oscillator algebra introduced by Brzezi´nski et al.

ar X iv : c on d - m at / 9 60 10 94 v 1 2 2 Ja n 19 96 Excitons in insulating cuprates

We study the electronic excitations near the charge-transfer gap in insulating CuO 2 planes, starting from a six-band model which includes p π and d xy orbitals and Cu-O nearest-neighbor repulsion U pd. While the low lying electronic excitations in the doped system are well described by a modified t−J model, the excitonic states of the insulator include hybrid d xy − p π states of A 2g symmetry...