2020/10/22 by Oscar Pozo, Óscar Pozo, Peng Rao +2
Physics and Astronomy · #Advanced Condensed Matter Physics #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Fermi liquid theory #Mathematical physics #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quasiparticle #Superconductivity #Superfluidity #cond-mat.quant-gas #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.103.035145
published as Phys. Rev. B 103, 035145 (2021) · 18 pages, 17 figures
arxiv created 2020/10/22 · openalex created_date 2020/10/29 · openalex publication_date 2021/01/28 · arxiv updated 2021/02/03 · openalex updated_date 2026/08/05
We study in detail the properties of \ensuremathπ fluxes embedded in a state with a finite density of anyons that form either a Fermi liquid or a Bose-Einstein condensate. By employing a recently developed exact lattice bosonization in 2D, we demonstrate that such \ensuremathπ flux remains a fully deconfined quasiparticle with a finite energy cost in a Fermi liquid of emergent fermions coupled to a ℤ2 gauge field. This \ensuremathπ flux is accompanied by a screening cloud of fermions, which in the case of a Fermi gas with a parabolic dispersion binds exactly 1/8 of a fermionic hole. In addition, there is a long-ranged power-law oscillatory disturbance of the liquid surrounding the \ensuremathπ flux akin to Friedel oscillations. These results carry over directly to the \ensuremathπ flux excitations in orthogonal metals. In sharp contrast, when the \ensuremathπ flux is surrounded by a Bose-Einstein condensate of particles coupled to a ℤ2 gauge field, it binds a superfluid half-vortex, becoming a marginally confined excitation with a logarithmic energy cost divergence.