Mitchell, Andrew K., Vojta, Matthias ORCID: 0000-0002-5740-831X, Bulla, Ralf and Fritz, Lars (2013). Quantum phase transitions and thermodynamics of the power-law Kondo model. Phys. Rev. B, 88 (19). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1550-235X

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Abstract

We revisit the physics of a Kondo impurity coupled to a fermionic host with a diverging power-law density of states near the Fermi level, rho(omega) similar to |omega|(r), with exponent -1 < r < 0. Using the analytical understanding of several fixed points, based partially on powerful mappings between models with bath exponents r and (-r), combined with accurate numerical renormalization group calculations, we determine thermodynamic quantities within the stable phases and also near the various quantum phase transitions. Antiferromagnetic Kondo coupling leads to strong screening with a negative zero-temperature impurity entropy, while ferromagnetic Kondo coupling can induce a stable fractional spin moment. We formulate the quantum field theories for all critical fixed points of the problem, which are fermionic in nature and allow for a perturbative renormalization-group treatment.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Mitchell, Andrew K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vojta, MatthiasUNSPECIFIEDorcid.org/0000-0002-5740-831XUNSPECIFIED
Bulla, RalfUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fritz, LarsUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-472034
DOI: 10.1103/PhysRevB.88.195119
Journal or Publication Title: Phys. Rev. B
Volume: 88
Number: 19
Date: 2013
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 1550-235X
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
GAPLESS FERMI SYSTEMS; PSEUDOGAP ANDERSON MODEL; NUMERICAL RENORMALIZATION-GROUP; MAGNETIC-IMPURITIES; FIELD-THEORY; SUPERCONDUCTORS; DYNAMICS; DIMENSIONS; BEHAVIOR; METALSMultiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/47203

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