Optical-absorption spectra of single-layer graphene in a periodic magnetic field

Chiu, Y. H.; Ou, Y. C.; Liao, Y. Y.; Lin, M. F.

doi:doi:10.1116/1.3359600

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Journal of Vacuum Science & Technology B / Volume 28 / Issue 2 / Regular Articles

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J. Vac. Sci. Technol. B 28, 386 (2010); http://dx.doi.org/10.1116/1.3359600 (5 pages)

Optical-absorption spectra of single-layer graphene in a periodic magnetic field

Y. H. Chiu¹, Y. C. Ou¹, Y. Y. Liao², and M. F. Lin¹

¹Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan
²Department of Applied Physics, National University of Kaohsiung, Kaohsiung 81148, Taiwan

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(Published online 26 March 2010)

Abstract

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The low-frequency magnetoelectronic properties of single-layer graphene in a periodic magnetic field are studied by the gradient approximation within the Peierls tight-binding model. A modulated magnetic field along the zigzag direction is chosen for a detailed investigation of optical absorption spectra. The electric polarization is taken to be perpendicular to the modulated direction. The absorption spectra exhibit many prominent and inconspicuous asymmetric peaks. They result from the transitions of the original and extra band-edge states, respectively. The prominent peaks are discussed in detail and they obey a simple optical selection rule, Δn = |n^v−n^c| = 1, similar to that in a uniform magnetic field. Such a rule can be ascribed to certain characteristics of the wave functions. The energy of the prominent peaks strongly depends on the strength, while it exhibits little dependence on the period. The abovementioned results can be verified by optical measurements.

ACKNOWLEDGMENTS

This work was supported by the NSC and NCTS of Taiwan under Grant Nos. NSC 95-2112-M-006-028-MY3 and NSC 96-2112-M009-021.

Article Outline

INTRODUCTION
THEORY
RESULTS AND DISCUSSIONS
CONCLUSIONS

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KEYWORDS and PACS

Keywords

band structure, gradient methods, graphene, magnetoelectric effects, tight-binding calculations, Graphene, Optical absorption, Selection rule, Magnetic field, Tight-binding model

PACS

78.67.Wj

Optical properties of graphene
73.22.Pr

Electronic structure of graphene
71.15.Ap

Basis sets (LCAO, plane-wave, APW, etc.) and related methodology (scattering methods, ASA, linearized methods, etc.)
75.85.+t

Magnetoelectric effects, multiferroics

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History

Received 24 September 2009
Accepted 8 February 2010
Published online 26 March 2010

Digital Object Identifier

http://dx.doi.org/10.1116/1.3359600

PUBLICATION DATA

ISSN

1071-1023 (print)

1520-8567 (online)

Publisher

American Vacuum Society

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