2010/07/14 by David F. Mross, T. Senthil
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Organic and Molecular Conductors Research #Physics of Superconductivity and Magnetism #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.84.041102
published as Phys. Rev. B 84, 041102(R) (2011) · 6 pages, 3 figures
arxiv created 2010/07/14 · openalex publication_date 2011/07/18 · arxiv updated 2012/01/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
When a metal undergoes a transition to an insulator it will lose its electronic Fermi surface. Interestingly, in some situations a ``ghost'' Fermi surface of electrically neutral spin carrying fermions may survive into the insulator. Such a novel ghost Fermi surface has been proposed to underlie the properties of a few different materials but its direct detection has proven elusive. In this paper, we show that the ghost Fermi surface leads to slowly decaying spatial oscillations of the electron density near impurities or other defects. These and related oscillations stem from the sharpness of the ghost Fermi surface and are direct analogs of the familiar Friedel oscillations in metals. The oscillation period contains geometric information about the shape of the ghost Fermi surface, which can be potentially exploited to detect its existence.