Loop current fluctuations and quantum critical transport
نویسندگان
چکیده
We study electrical transport at quantum critical points (QCPs) associated with loop current ordering in a metal, focusing specifically on models of the “Hertz-Millis” type. At infrared (IR) fixed point and absence disorder, simplest such have infinite DC conductivity zero incoherent nonzero frequencies. However, we find that particular deformation, involving N N species bosons fermions random couplings flavor space, admits finite incoherent, frequency-dependent IR point, \sigma(\omega>0)\sim\omega^{-2/z} display="inline">σ(ω>0)∼ω−2/z , where z display="inline">z is boson dynamical exponent. Leveraging non-perturbative structure anomalies, develop powerful calculational method for transport. The resulting "anomaly-assisted large expansion" allows us to extract systematically. Although our results imply random-flavor are problematic as description physical = 1 display="inline">N=1 system, they serve illustrate some general conditions well anomaly-assisted methods. In addition, revisit an old result irrelevant operators generate conductivity, \sigma(\omega>0) \sim \omega^{-2(z-2)/z} form="postfix">)∼ω−2(z−2)/z problems this kind. show explicitly, within scope original calculation, does not hold any order parameter.
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ژورنال
عنوان ژورنال: SciPost physics
سال: 2023
ISSN: ['2542-4653']
DOI: https://doi.org/10.21468/scipostphys.14.5.113