For 10 points, name this phenomenon in which current flows without an appreciable resistance.
In the chiral form of this phenomenon, the pairing gap wraps around the Fermi surface by multiples of 2 pi, breaking time reversal symmetry. Materials displaying this phenomenon are frequently described by a Gor'kov or BogoliubovÂ–de Gennes Hamiltonian. A four-dimensional model of this phenomenon named for Coleman and Weinberg extends another model of it, and Abrikosov used that model to describe his namesake vortices in materials with this phenomenon. It arises due to phonon-mediated interactions creating a boson-like particle from pairs of electrons according to BCS theory, and mercury exhibits this property when cooled to below 4.1 kelvins. For 10 points, name this phenomenon in which current flows without an appreciable resistance.
In the chiral form of this phenomenon, the pairing gap wraps around the Fermi surface by multiples of 2 pi, breaking time reversal symmetry.
superconductivity [accept word forms]