More Physics...

BCS superconductivity, named after Bardeen, Cooper, and Schrieffer, is a remarkable phenomenon in condensed matter physics that arises from the collective behavior of electrons in a material. At low temperatures, electrons in a superconducting material form pairs called Cooper pairs, which are mediated by the exchange of lattice vibrations, known as phonons. This pairing mechanism overcomes the repulsive Coulomb interaction between electrons and leads to a macroscopic quantum state with zero electrical resistance. BCS theory provides a comprehensive framework for understanding superconductivity by describing the formation of Cooper pairs and their condensation into a coherent quantum state. It predicts the existence of an energy gap in the electronic spectrum, below which all states are filled, known as the superconducting energy gap.

One fascinating phenomenon that falls within the realm of my active research interests under Low-temperature Superconductivity is Andreev reflection. Andreev reflection refers to the process where an electron incident on an interface between a normal metal and a superconductor is reflected back as a hole with opposite momentum. This intriguing process arises due to the peculiar properties of superconductors, where the formation of Cooper pairs leads to the existence of electron-like quasiparticles called Andreev bound states. These Andreev bound states play a crucial role in various transport phenomena and can have profound implications for nanoscale devices and quantum information processing.