Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 41: Quantum-Critical Phenomena (joint session TT/DY)
TT 41.7: Talk
Thursday, March 20, 2025, 11:15–11:30, H31
One-loop perturbative structure of a (2+1)D bosonized non-Fermi liquid — •Parasar R. Thulasiram1,2, Chris Hooley3, and Roderich Moessner1 — 1Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — 2Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 3Centre for Fluid and Complex Systems, Coventry University, Coventry, United Kingdom
Non-Fermi liquids are a class of metals with no quasiparticle excitations often arising from the interaction of slow collective modes, such as an emergent critical boson, with a Fermi surface. Minimal models of this type are called Hertz-Millis-Moriya models and historically suffer from uncontrolled approximations in perturbation theory and patchy treatments of the Fermi surface, preventing the study of global-Fermi surface physics. Delacrétaz et al. (2022) recast Fermi liquid theory in any dimension via a bosonic field that parametrizes macroscopic particle-hole excitations about the whole Fermi surface. This bosonized field theory is suggested to reduce the order in perturbation theory necessary to calculate important quantities and is considerate of whole Fermi surface fluctuations, potentially providing the first robust results of a Hertz-Millis-Moriya theory when coupled to a critical boson. We present initial results of the one-loop critical boson self-energy in 2+1D for calculating the dynamical critical exponent and discuss the benefits and challenges of this theory.
Keywords: Non-Fermi Liquid; Quantum Criticality; Bosonization; Strongly Correlated Electrons; Quantum Field Theory