Exceeding the Landau speed limit with topological Bogoliubov Fermi surfaces
S. Autti, J. T. Mäkinen, J. Rysti, G. E. Volovik, V. V. Zavjalov, V. B. Eltsov
Abstract
The authors show that topological superfluid 3He can flow without friction in a phase which possesses a line of zero energy in the excitation spectrum, although the Landau's limit for superflow is zero. The flow expands the node line to a Fermi surface for Bogoliubov quasipartices, which is usually absent in Cooper-paired systems, but may appear in unconventional superconductors and superfluids with certain broken symmetries.
Topics & Concepts
PhysicsSuperfluidityLimit (mathematics)SuperconductivityLine (geometry)Topology (electrical circuits)Flow (mathematics)ExcitationCondensed matter physicsQuantum oscillationsFermi Gamma-ray Space TelescopeFermi energyPhase (matter)Fermi gasEnergy (signal processing)Quantum mechanicsNode (physics)Fermi surfaceZero (linguistics)VortexPhase transitionLoop (graph theory)Surface (topology)Superfluid filmOscillation (cell signaling)Winding numberGinzburg–Landau theoryTopological Materials and PhenomenaQuantum, superfluid, helium dynamicsQuantum and electron transport phenomena