Charge response function and a novel plasmon mode in graphene
| dc.creator | Gangadharaiah, S. | |
| dc.creator | Farid, A. M. | |
| dc.creator | Mishchenko, E. G. | |
| dc.date | 2007-10-03 | |
| dc.date | 2008-05-02 | |
| dc.date.accessioned | 2026-07-07T09:36:29Z | |
| dc.date.available | 2026-07-07T09:36:29Z | |
| dc.description | Polarizability of non-interacting 2D Dirac electrons has a 1/\sqrt{qv-ω} singularity at the boundary of electron-hole excitations. The screening of this singularity by long-range electron-electron interactions is usually treated within the random phase approximation. The latter is exact only in the limit of N -> infinity, where N is the ``color'' degeneracy. We find that the ladder-type vertex corrections become crucial close to the threshold as the ratio of the n-th order ladder term to the same order RPA contribution is (\ln|qv-ω|)^n/N^n$. We perform analytical summation of the infinite series of ladder diagrams which describe excitonic effect. Beyond the threshold, qv>ω, the real part of the polarization operator is found to be positive leading to the appearance of a strong and narrow plasmon resonance. | |
| dc.description | 4 pages, 3 figures,typos corrected | |
| dc.identifier | https://arxiv.org/abs/0710.0622 | |
| dc.identifier | http://arxiv.org/abs/0710.0622 | |
| dc.identifier | Phys. Rev. Lett. 100, 166802 (2008) | |
| dc.identifier | doi:10.1103/PhysRevLett.100.166802 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/160137 | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.title | Charge response function and a novel plasmon mode in graphene | |
| dc.type | text |