Piazza, Francesco ORCID: 0000-0003-1332-6627, Zwerger, Wilhelm and Strack, Philipp ORCID: 0000-0002-7040-521X (2016). FFLO strange metal and quantum criticality in two dimensions: Theory and application to organic superconductors. Phys. Rev. B, 93 (8). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

Increasing the spin imbalance in superconductors can spatially modulate the gap by forming Cooper pairs with finite momentum. For large imbalances compared to the Fermi energy, the inhomogeneous FFLO superconductor ultimately becomes a normal metal. There is mounting experimental evidence for this scenario in two-dimensional (2D) organic superconductors in large in-planemagnetic fields; this is complemented by ongoing efforts to realize this scenario in coupled tubes of atomic Fermi gases with spin imbalance. Yet, a theory for the phase transition from a metal to an FFLO superconductor has not been developed so far and the universality class has remained unknown. Here we propose and analyze a spin imbalance driven quantum critical point between a 2D metal and an FFLO phase in anisotropic electron systems. We derive the effective action for electrons and bosonic FFLO pairs at this quantum phase transition. Using this action, we predict non-Fermi-liquid behavior and the absence of quasiparticles at a discrete set of hot spots on the Fermi surfaces. This results in strange power laws in thermodynamics and response functions, which are testable with existing experimental setups on 2D organic superconductors and may also serve as signatures of the elusive FFLO phase itself. The proposed universality class is distinct from previously known quantum critical metals and, because its critical fluctuations appear already in the pairing channel, a promising candidate for naked metallic quantum criticality over extended temperature ranges.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Piazza, FrancescoUNSPECIFIEDorcid.org/0000-0003-1332-6627UNSPECIFIED
Zwerger, WilhelmUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Strack, PhilippUNSPECIFIEDorcid.org/0000-0002-7040-521XUNSPECIFIED
URN: urn:nbn:de:hbz:38-284730
DOI: 10.1103/PhysRevB.93.085112
Journal or Publication Title: Phys. Rev. B
Volume: 93
Number: 8
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:
KeywordsLanguage
SPIN-FERMION MODEL; CRITICAL FIELD; STATE; PHASEMultiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/28473

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