p + ip-wave pairing symmetry at type-II van Hove singularities

Based on the random phase approximation calculation in two-orbital honeycomb lattice model, we investigate the pairing symmetry of Ni-based transition-metal trichalcogenides by electron doping access to type-II van Hove singularities (vHs). We find that chiral even-parity d + i d -wave ( E g ) state...

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Bibliographic Details
Published in:Frontiers of physics 2021-10, Vol.16 (5), p.53501, Article 53501
Main Authors: Li, Yin-Xiang, Yang, Xiao-Tong
Format: Article
Language:English
Subjects:
Analysis
Antiferromagnetism
Approximation
Astronomy
Astrophysics and Cosmology
Atomic
Condensed Matter Physics
Density of states
Doping
Electrons
Ferromagnetism
Molecular
Optical and Plasma Physics
Parity
Particle and Nuclear Physics
Phase transitions
Physics
Physics and Astronomy
Research Article
Singularities
Superconductivity
Superconductors
Symmetry
Transition metals
Unconventional superconductors
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Summary:Based on the random phase approximation calculation in two-orbital honeycomb lattice model, we investigate the pairing symmetry of Ni-based transition-metal trichalcogenides by electron doping access to type-II van Hove singularities (vHs). We find that chiral even-parity d + i d -wave ( E g ) state is suppressed by odd-parity p + i p -wave ( E u ) state when electron doping approaches the type-II vHs. The type-II vHs peak in density of states (DOS) enables to strengthen the ferromagnetic fluctuation, which is responsible for triplet pairing. The competition between antiferromagnetic and ferromagnetic fluctuation results in pairing phase transition from singlet to triplet pairing. The Ni-based transition-metal trichalcogenides provide a promising platform to unconventional superconductor emerging from electronic DOS.
ISSN:2095-0462
2095-0470
DOI:10.1007/s11467-021-1068-7