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Chiral d-wave superconductivity in doped graphene
Annica M Black-Schaffer1, Carsten Honerkamp
1Department of Physics and Astronomy, Uppsala University, Box 516, S-75120 Uppsala, Sweden.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|September 20, 2014
Summary
Researchers found theoretical evidence for an unconventional chiral d-wave superconducting state in doped graphene. This state, linked to electron interactions and the van Hove singularity, shows unique properties and stability.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Doped graphene exhibits unique electronic properties due to its hexagonal lattice structure.
- Electron-electron interactions are proposed to drive unconventional superconductivity in graphene.
- The van Hove singularity at 1/4 doping is a critical point for potential superconducting states.
Purpose of the Study:
- To review theoretical evidence for a chiral d-wave superconducting state in doped graphene.
- To discuss the properties, stability, and enhancement of this unconventional superconducting state.
- To explore other materials exhibiting chiral d-wave superconductivity.
Main Methods:
- Review of theoretical studies employing mean-field approaches.
- Analysis of angle-resolved renormalization group calculations.
- Examination of electron-electron interaction models in graphene.
Main Results:
- Mounting theoretical evidence supports a spin-singlet dx2-y2+/-idxy-wave (chiral d-wave) superconducting state in doped graphene.
- This state is particularly likely at the van Hove singularity (1/4 doping) due to diverging density of states.
- The chiral d-wave state demonstrates distinctive properties and stability against disorder.
Conclusions:
- The chiral d-wave superconducting state is a plausible emergent phenomenon in doped graphene, driven by electron interactions.
- Proximity-induced superconductivity can enhance this state.
- The hexagonal lattice is crucial for chiral d-wave superconductivity, with implications for other materials.
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