PNNL

Abstract

We introduce a comprehensive theoretical framework for the fermionic su- per?uid dynamics, grounded on a local extension of the time-dependent den- sity functional theory. With this approach we describe the generation and the real-time evolution and interaction of quantized vortices, the large amplitude collective modes, as well as the loss of super?uidity at high ?ow velocities. We demonstrate the formation of vortex rings and provide for the ?rst time a microscopic description of the crossing and the reconnection of quantized vortex lines in a fermion super?uid, which provide the mechanism for the emergence of quantum turbulence at very low temperatures. We observe that super?uidity often survives when these systems are stirred with velocities far exceeding the speed of sound.