J H Ho et al 2008 Nanotechnology 19 035712 doi:10.1088/0957-4484/19/03/035712
J H Ho, Y H Lai, Y H Chiu and M F Lin
Show affiliationsMagnetoelectronic properties of a single-layer graphene are studied by the Peierls tight-binding model. A new numerical technique is developed to obtain a band-like Hamiltonian matrix. A spatially modulated magnetic field B' could drastically alter the Landau levels due to a uniform magnetic field B. The modulation effects include enhancement in dimensionality, change of energy dispersions, destruction of state degeneracy and creation of band-edge states. The dispersionless Landau levels, those at the Fermi levels excepted, become the 1D parabolic bands. The density of states thus exhibits many pairs of asymmetric prominent peaks. The height, frequency and number of pronounced peaks strongly depend on the modulation strength. These characteristics are hardly affected by the period and direction when B' is much weaker than B. The predicted results could be verified by experimental measurements on magneto-optical absorption spectra.
Issue 3 (23 January 2008)
Received 2 August 2007, in final form 20 September 2007
Published 14 December 2007
J H Ho et al 2008 Nanotechnology 19 035712
Michał Spaliński JCAP04(2008)002
Chun-Wang Ma et al 2010 J. Phys. G: Nucl. Part. Phys. 37 015104
H Xing et al 2008 Nanotechnology 19 025704
G Marullo Reedtz and R Cerri 2004 Metrologia 41 01001
M Dahoumane et al 2008 JINST 3 P03002
Patrick Meade et al JHEP12(2009)052
Xingtao Jia et al 2008 J. Phys. D: Appl. Phys. 41 085004
S Solve et al 2009 Metrologia 46 01010
J Chen and S J Bull 2008 J. Phys. D: Appl. Phys. 41 074009