Classen, Laura, Chubukov, Andrey, V, Honerkamp, Carsten and Scherer, Michael M. (2020). Competing orders at higher-order Van Hove points. Phys. Rev. B, 102 (12). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

Full text not available from this repository.

Abstract

Van Hove points are special points in the energy dispersion, where the density of states exhibits analytic singularities. When a Van Hove point is close to the Fermi level, tendencies towards density wave orders, Pomeranchuk orders, and superconductivity can all be enhanced, often in more than one channel, leading to a competition between different orders and unconventional ground states. Here we consider the effects from higher-order Van Hove points, around which the dispersion is flatter than near a conventional Van Hove point, and the density of states has a power-law divergence. We argue that such points are present in intercalated graphene and other materials. We use an effective low-energy model for electrons near higher-order Van Hove points and analyze the competition between different ordering tendencies using an unbiased renormalization-group approach. For purely repulsive interactions, we find that two key competitors are ferromagnetism and chiral superconductivity. For a small attractive interaction, we find an unconventional spin Pomeranchuk order, in wich the spin oder parameter winds around the Fermi surface. The supermetal state, predicted for a single higher-order Van Hove point, is an unstable fixed point in our case.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Classen, LauraUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chubukov, Andrey, VUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Honerkamp, CarstenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Scherer, Michael M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-318403
DOI: 10.1103/PhysRevB.102.125141
Journal or Publication Title: Phys. Rev. B
Volume: 102
Number: 12
Date: 2020
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2469-9969
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
FUNCTIONAL RENORMALIZATION-GROUP; FERMI-SURFACE; SUPERCONDUCTIVITYMultiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/31840

Downloads

Downloads per month over past year

Altmetric

Export

Actions (login required)

View Item View Item