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Edge magnetoplasmons and the optical excitations in graphene disks

Weihua Wang (Institutionen för teknisk fysik, Kondenserade materiens teori) ; S. Peter Apell (Institutionen för teknisk fysik, Kondenserade materiens teori) ; Jari M. Kinaret (Institutionen för teknisk fysik, Kondenserade materiens teori)
Physical Review B (1098-0121). Vol. 86 (2012), 12,
[Artikel, refereegranskad vetenskaplig]

We discuss the edge magnetoplasmon properties in highly doped graphene disks, and the corresponding optical excitations. Edge magnetoplasmons with nonzero angular momentum (l not equal 0) have two branches corresponding to different edge current rotations with respect to the magnetic field. The resonance energies of one branch are blueshifted and the other redshifted relative to energies at B = 0, with the energy differences linearly proportional to the magnetic field. Recently, the l = 1 dipole mode has been investigated by two experiments using optical transmission spectroscopy [Crassee et al., Nano Lett. 12, 2470 (2012); Yan et al., ibid. 12, 3766 (2012)], and classical cyclotron resonances were found in highly doped graphene samples. These are determined by graphene magneto-optical conductivities, which behave like a conventional two-dimensional electron system in the high doping limit.

Nyckelord: 2-dimensional electron-gas, monolayer graphene, plasmons, photonics



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Denna post skapades 2012-11-07. Senast ändrad 2015-07-01.
CPL Pubid: 165597

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kondenserade materiens teori (1900-2015)

Ämnesområden

Nanovetenskap och nanoteknik
Fysik

Chalmers infrastruktur