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Tree-level electron-photon interactions in graphene
- Source :
- Phys.Rev.B81:245401,2010
- Publication Year :
- 2010
-
Abstract
- Graphene's low-energy electronic excitations obey a 2+1 dimensional Dirac Hamiltonian. After extending this Hamiltonian to include interactions with a quantized electromagnetic field, we calculate the amplitude associated with the simplest, tree-level Feynman diagram: the vertex connecting a photon with two electrons. This amplitude leads to analytic expressions for the 3D angular dependence of photon emission, the photon-mediated electron-hole recombination rate, and corrections to graphene's opacity $\pi \alpha$ and dynamic conductivity $\pi e^2/2 h$ for situations away from thermal equilibrium, as would occur in a graphene laser. We find that Ohmic dissipation in perfect graphene can be attributed to spontaneous emission.<br />Comment: 5 pages, 3 figures
Details
- Database :
- arXiv
- Journal :
- Phys.Rev.B81:245401,2010
- Publication Type :
- Report
- Accession number :
- edsarx.1003.4419
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.81.245401