Instability of the Non-Fermi-Liquid Fixed Point in the Dissipative Gauge Theory of Fermions (I)Impurity Effects

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dc.creatorTakano, Hiroshi
dc.creatorOnoda, Masaru
dc.creatorIchinose, Ikuo
dc.creatorMatsui, Tetsuo
dc.date1996-12-14
dc.date.accessioned2026-07-07T09:11:24Z
dc.date.available2026-07-07T09:11:24Z
dc.descriptionWe study a dissipative gauge theory of nonrelativistic fermions in 2+1 dimensions at zero temperature by the Wilsonian renormalization-group method. In this theory, we incorporate in the fermion propagator a new term of the form $ i κ\cdot\sign(ω)$ (where $κ$ is a parameter and $ω$ is the fermion frequency), which is usually induced by impurity effects. In the previous papers, we studied this system for $κ= 0$, and showed that there exists a non-Fermi-liquid infrared fixed point. In this paper, we address the question whether this non-Fermi-liquid behavior remains stable or not in the presence of impurity effects, i.e., the $κ$ term. Our results show that the non-Fermi-liquid fixed point is unstable for $κ\neq 0$ and an effective gauge coupling constant tends to vanish at low energies. However, in intermediate energy scales, the behavior of correlation functions for $κ\neq 0$ is controlled by the non-Fermi-liquid fixed point at $κ=0$, i.e., a crossover phenomenon appears. Physical implications of this phenomenon are discussed.
dc.description33 Pages, Latex, 3 ps-figures included
dc.identifierhttps://arxiv.org/abs/cond-mat/9612134
dc.identifierhttp://arxiv.org/abs/cond-mat/9612134
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/151663
dc.subjectStrongly Correlated Electrons
dc.subjectHigh Energy Physics - Theory
dc.titleInstability of the Non-Fermi-Liquid Fixed Point in the Dissipative Gauge Theory of Fermions (I)Impurity Effects
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