Unusual microwave response of dirac quasiparticles in graphene.
Phys Rev Lett
; 96(25): 256802, 2006 Jun 30.
Article
en En
| MEDLINE
| ID: mdl-16907333
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 Omega and this unusual line shape changes to Drude-like by increasing the chemical potential |mu|, with width linear in mu. The interband contribution at T=0 is a constant independent of Omega with a lower cutoff at 2mu. Distinctly different behavior occurs if interaction-induced phenomena in graphene cause an opening of a gap Delta. At a large magnetic field B, the diagonal and Hall conductivities at small Omega become independent of B but remain nonzero and show a structure associated with the lowest Landau level. This occurs because in the Dirac theory the energy of this level, E0 = +/-Delta, is field independent in sharp contrast to the conventional case.
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MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Año:
2006
Tipo del documento:
Article
País de afiliación:
Ucrania
Pais de publicación:
Estados Unidos