One of the most beautiful theories of condensed matter is certainly the theory of conventional superconductivity. Called the BCS theory after the names of the creators (Bardeen, Cooper and Schrieffer), it explains the zero resistance appearing in particular materials when their temperature approaches absolute zero. In the BCS theory, electrons are bound together by an attractive interaction and...

Experimental evidence and theoretical modeling suggest that piles of confined, high-restitution grains, subject to low-amplitude vibration, can serve as experimentally-accessible analogs for studying a range of liquid-state molecular hydrodynamic processes. Experiments expose single-grain and multiple-grain, collective dynamic features that mimic those either observed or predicted in molecular-...

The realization that entanglement can affect macroscopic properties of bulk solid-state systems is a challenge in physics and Chemistry. Theoretical physicists often are considered the entanglement between nearest-neighbor (NN) spins and tried to find its characterizations in terms of macroscopic thermodynamics observables as magnetization and specific heat. Here, we focus on the entanglement b...

24 ISSN:1369 7021 © Elsevier Science Ltd 2002 Conventional superconductors Bardeen-Cooper-Schrieffer (BCS) theory provides a microscopic picture of how attractive electron-electron interactions in the degenerate electron gas of a metal result in the formation of Cooper-pairs1. Each Cooper-pair can be considered a bound state of two electrons with opposite spin and momentum. The superconducting ...