Universität zu Köln

Maier, Stefan A. and Strack, Philipp ORCID: 0000-0002-7040-521X (2016). Universality in antiferromagnetic strange metals. Phys. Rev. B, 93 (16). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We propose a theory of metals at the spin-density-wave quantum-critical point in spatial dimension d = 2. We provide a first estimate of the full set of critical exponents (dynamical exponent z = 2.13, correlation length upsilon= 1.02, spin susceptibility gamma= 0.96, electronic non-Fermi liquid eta(f)(tau) = 0.53, spin-wave Landau damping eta(b)(tau)= 1.06), which determine the universal power laws in thermodynamics and response functions in the quantumcritical regime relevant for experiments in heavy-fermion systems and iron pnictides. We present approximate numerical and analytical solutions of Polchinski-Wetterich-type flow equations with soft frequency regulators for an effective action of electrons coupled to spin-wave bosons. Performing the renormalization group in frequency instead of momentum space allows to track changes of the Fermi-surface shape and to capture Landau damping during the flow. The technique is easily generalizable from models retaining only patches of the Fermi surface to full, compact Fermi surfaces.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Maier, Stefan A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Strack, Philipp UNSPECIFIED orcid.org/0000-0002-7040-521X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-278760
DOI:	10.1103/PhysRevB.93.165114
Journal or Publication Title:	Phys. Rev. B
Volume:	93
Number:	16
Date:	2016
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language QUANTUM CRITICAL-POINT; SPIN-FERMION MODEL; RENORMALIZATION-GROUP; SYSTEMS Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/27876