Amperean Pairing at the Surface of Topological Insulators
Amperean Pairing at the Surface of Topological Insulators
The surface of a 3D topological insulator is described by a helical electron state with the electron's spin and momentum locked together. We show that in the presence of ferromagnetic fluctuations the surface of a topological insulator is unstable towards a superconducting state with unusual pairing, dubbed Amperean pairing. The …