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Unconventional superconductivity and interaction induced Fermi surface reconstruction in the two-dimensional Edwards
Dai-Ning Cho1, Jeroen van den Brink1, Holger Fehske2
1IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany.
Scientific Reports
|March 4, 2016
Summary
We investigate the interplay between superconductivity and charge density waves in a general 2D transport model. A novel Fermi surface emerges, leading to charge density wave formation and unconventional superconductivity.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- The Edwards Hamiltonian describes fermionic charge carriers coupled to a correlated background medium in 2D.
- Understanding competing orders like superconductivity and charge density waves is crucial for novel material design.
Purpose of the Study:
- To investigate the competition between unconventional superconducting pairing and charge density wave (CDW) formation.
- To analyze the emergence of novel Fermi surface structures and their impact on electronic properties.
Main Methods:
- Utilizing the projective renormalization method.
- Analyzing the two-dimensional Edwards Hamiltonian at half filling.
Main Results:
- A strong renormalization of the fermionic band leads to a new hole-like Fermi surface.
- This new Fermi surface facilitates charge density wave formation.
- Superconductivity with a sign-changing order parameter is induced on disconnected parts of the new Fermi surface.
Conclusions:
- The study reveals a mechanism for coexisting superconductivity and charge density waves.
- Findings provide insights into iron-based oxypnictide superconductors.
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