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Optical self-energy in graphene due to correlations
J Hwang1, J P F LeBlanc, J P Carbotte
1Department of Physics, Sungkyunkwan University, Suwon, Gyeonggi-do, Republic of Korea.
We reveal how optical self-energy in graphene mirrors quasiparticle properties, distinguishing electron-electron and electron-phonon interactions. This method extracts excitation spectra from optical data.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Optics
Background:
- Highly correlated systems exhibit complex electronic behaviors.
- Optical self-energy offers insights into inelastic scattering processes.
- Understanding quasiparticle (QP) self-energy is crucial for electronic structure.
Purpose of the Study:
- To calculate the optical self-energy for intraband transitions in graphene.
- To investigate contributions from electron-electron interaction (EEI) and electron-phonon interaction (EPI).
- To develop a method for extracting quantitative excitation spectra from optical data.
Main Methods:
- Calculation of optical self-energy for intraband transitions in graphene.
- Analysis of contributions from EEI and EPI.
- Comparison of optical self-energy structure with QP self-energy near the Fermi momentum (kF).
Main Results:
- Optical self-energy structure in graphene primarily mirrors QP self-energy near kF, not at the Dirac point (k=0).
- EPI contributions show sharp peaks related to phonon density of states.
- EEI contributions are structureless, scaling linearly with chemical potential.
- Modulations in interband optical conductivity are linked to QP self-energies near kF.
Conclusions:
- The study establishes a method to extract excitation spectra from optical data in graphene.
- Intraband optical response is dominated by QP properties near the Fermi momentum.
- Plasmaronic effects near the Dirac point are negligible in intraband optical response.
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