2005/08/31 by Michael J. Lawler, Victoria Fernandez, Daniel G. Barci +4 · 1 citation
Physics and Astronomy · #Bosonization #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Critical exponent #Electron #Fermi gas #Fermi liquid theory #Fermi surface #Fermion #Phase transition #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum critical point #Quantum mechanics #Quantum oscillations #Quantum phase transition #Superconductivity #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.73.085101
published as Phys. Rev. B 73, 085101 (2006) · 20 pages, 2 figures, 1 table; new version with minor changes; new subsection 3C2 added with an explicit calculation of the quasiparticle residue at the nematic transition; minor typos corrected, new references; general beautification of the text and figure 2
arxiv created 2005/10/27 · openalex publication_date 2006/02/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We discuss shape (Pomeranchuk) instabilities of the Fermi surface of a two-dimensional Fermi system using bosonization. We consider in detail the quantum critical behavior of the transition of a two-dimensional Fermi fluid to a nematic state which breaks spontaneously the rotational invariance of the Fermi liquid. We show that higher dimensional bosonization reproduces the quantum critical behavior expected from the Hertz-Millis analysis, and verify that this theory has dynamic critical exponent z=3. Going beyond this framework, we study the behavior of the fermion degrees of freedom directly, and show that at quantum criticality as well as in the quantum nematic phase (except along a set of measure zero of symmetry-dictated directions) the quasiparticles of the normal Fermi liquid are generally wiped out. Instead, they exhibit short-ranged spatial correlations that decay faster than any power law, with the law \ensuremath|x\ensuremath|^\ensuremath-1exp(\ensuremath-const\phantom\rule0.3em0ex\ensuremath|x\ensuremath|1∕3) and we verify explicitly the vanishing of the fermion residue utilizing this expression. In contrast, the fermion autocorrelation function has the behavior \ensuremath|t\ensuremath|^\ensuremath-1exp(\ensuremath-const\phantom\rule0.3em0ex\ensuremath|t\ensuremath|^\ensuremath-2∕3). In this regime we also find that, at low frequency, the single-particle fermion density of states behaves as N*(\ensuremathω)=N*(0)+B\ensuremathω2∕3ln\ensuremathω+\ensuremath⋯, where N*(0) is larger than the free Fermi value, N(0), and B is a constant. These results confirm the non-Fermi liquid nature of both the quantum critical theory and of the nematic phase.