2017/11/30 by M. Iskin
Physics and Astronomy · #Angular momentum #Atomic and Subatomic Physics Research #Center (category theory) #Center of mass (relativistic) #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Energy–momentum relation #Fermi Gamma-ray Space Telescope #Geometry #Helicity #Physics #Quantum #Quantum mechanics #Spin (aerodynamics) #Superfluidity #Tensor (intrinsic definition) #Topological Materials and Phenomena #Total angular momentum quantum number #cond-mat.quant-gas #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physreva.97.063625
published as Phys. Rev. A 97, 063625 (2018) · 6 pages with 4 figures; to appear in PRA
arxiv created 2018/06/17 · openalex publication_date 2018/06/28 · arxiv updated 2018/07/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The coupling between a quantum particle's intrinsic angular momentum and its center-of-mass motion gives rise to the so-called helicity states that are characterized by the projection of the spin onto the direction of momentum. In this paper, by unfolding the superfluid-density tensor into its intrahelicity and interhelicity components, we reveal that the latter contribution is directly linked with the total quantum metric of the helicity bands. We consider both Rashba and Weyl spin-orbit couplings across the BCS-BEC crossover and show that the geometrical interhelicity contribution is responsible for up to a quarter of the total superfluid density. We believe this is one of those elusive effects that may be measured within the highly tunable realm of cold Fermi gases.