Unusual Microwave Response of Dirac Quasiparticles in Graphene
| dc.creator | Gusynin, V. P. | |
| dc.creator | Sharapov, S. G. | |
| dc.creator | Carbotte, J. P. | |
| dc.date | 2006-03-09 | |
| dc.date.accessioned | 2026-07-07T07:02:18Z | |
| dc.date.available | 2026-07-07T07:02:18Z | |
| dc.description | Recent experiments have proven that the quasiparticles in graphene obey a Dirac equation. Here we show that microwaves are an excellent probe of their unusual dynamics. When the chemical potential is small the intraband response can exhibit a cusp around zero frequency $Ω$ and this unusual lineshape changes to Drude-like by increasing the chemical potential $|μ|$, with width also increasing linearly with $μ$. The interband contribution at T=0 is a constant independent of $Ω$ with a lower cutoff at $2 μ$. Distinctly different behavior occurs if interaction-induced phenomena in graphene cause an opening of a gap $Δ$. At large magnetic field $B$, the diagonal and Hall conductivities at small $Ω$ become independent of $B$ but remain nonzero and show structure associated with the lowest Landau level. This occurs because in the Dirac theory the energy of this level, $E_0 = \pm Δ$, is field independent in sharp contrast to the conventional case. | |
| dc.description | 4 pages, RevTeX4, 4 EPS figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0603267 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0603267 | |
| dc.identifier | Phys.Rev.Lett. 96 (2006) 256802 | |
| dc.identifier | doi:10.1103/PhysRevLett.96.256802 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/108554 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.title | Unusual Microwave Response of Dirac Quasiparticles in Graphene | |
| dc.type | text |