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Charge stripes in the graphene-based materials
Petra Grozić1, Barbara Keran1, Anatoly M Kadigrobov1,2
1Department of Physics, Faculty of Science, University of Zagreb, Bijenička 32, Zagreb, 10000, Croatia.
Scientific Reports
|November 3, 2023
Summary
We modeled charge density wave instability in CaC6, revealing uniaxial charge stripes driven by Fermi surface topological reconstruction. This differs from traditional Fermi surface nesting mechanisms for charge density waves.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid State Physics
Background:
- Charge density wave (CDW) instability is a key phenomenon in low-dimensional materials.
- Previous models often relied on Fermi surface nesting for CDW formation.
- Graphene and intercalated graphite compounds exhibit complex electronic properties.
Purpose of the Study:
- To develop an analytical model for CDW instability in CaC6.
- To explain the experimentally observed uniaxial charge stripes.
- To elucidate the underlying mechanism driving the CDW state.
Main Methods:
- Analytical modeling of electronic properties.
- Investigation of phonon modes in the Ca-intercalated superlattice.
- Analysis of Fermi surface topology and its role in instability.
Main Results:
- The model predicts uniaxial charge stripes in CaC6.
- The instability is coupled to the softest phonon mode of the Ca superlattice.
- A novel CDW mechanism involving topological Fermi surface reconstruction was identified.
Conclusions:
- The study presents a new mechanism for CDW formation in chemically doped graphene.
- Topological reconstruction of the Fermi surface drives the stripe state condensation.
- This finding challenges the conventional Fermi surface nesting paradigm for CDWs.
