Abstract :

Superconductivity refers to a phenomenon where pairs of electrons (called Cooper pairs) “condense” in a macroscopic quantum state below a certain temperature giving rise to a material with zero electrical resistance. On the other hand, disorder tends to localize electrons in a metal, giving rise to an insulating ground state in the limit of strong disorder. The competition between these two opposing effects give rise to several remarkable phenomena, such as magnetic field driven transition from a superconductor to an insulator, the persistence of Cooper pairs even after the superconducting state is destroyed, and our recent observation of the Higgs mode in strongly disordered superconductors.