The anisotropic energy spectrum dependence of the optical conductivity in bilayer graphene

Yang, CH; Ao, ZM; Li, QF; Jiang, JJ

The anisotropic energy spectrum dependence of the optical conductivity in bilayer graphene

Yang, CH Ao, ZM

Li, QF Jiang, JJ

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Publication Type:: Journal Article
Citation:: Optics Communications, 2015, 338 pp. 145 - 148
Issue Date:: 2015-03-01

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Field	Value	Language
dc.contributor.author	Yang, CH	en_US
dc.contributor.author	Ao, ZM https://orcid.org/0000-0003-0333-3727	en_US
dc.contributor.author	Li, QF	en_US
dc.contributor.author	Jiang, JJ	en_US
dc.date.issued	2015-03-01	en_US
dc.identifier.citation	Optics Communications, 2015, 338 pp. 145 - 148	en_US
dc.identifier.issn	0030-4018	en_US
dc.identifier.uri	http://hdl.handle.net/10453/41242
dc.description.abstract	© 2014 Elsevier B.V. In this paper, the longitudinal optical conductivity in bilayer graphene was calculated analytically and numerically. In addition to the quadratic terms in the effective-mass approximation Hamiltonian, the linear term, which relates to the indirect interlayer coupling, was included. The nonparabolic energy dispersion was obtained. Two intra- and inter-band transition channels for optical transition via carriers absorbing the optical energy are observed. The inter-band transition offers the main contribution and is almost a constant when the optical energy is larger than two times the Fermi energy. In the presence of the complex energy and pseudospin angle relationship, doing the numerical integration to the wavevector k, the contribution of the intra-band optical transition to the optical conductivity (σxxintra(ω)) is strengthened in the low optical energy region, while the analytical results with parabolic energy curves contribute less to σxxintra(ω). In addition, the optical conductivity also depends on the electron density (or gate voltage) and the broadening width.	en_US
dc.relation.ispartof	Optics Communications	en_US
dc.relation.isbasedon	10.1016/j.optcom.2014.09.066	en_US
dc.subject.classification	Optoelectronics & Photonics	en_US
dc.title	The anisotropic energy spectrum dependence of the optical conductivity in bilayer graphene	en_US
dc.type	Journal Article
utslib.citation.volume	338	en_US
utslib.for	0205 Optical Physics	en_US
utslib.for	0906 Electrical and Electronic Engineering	en_US
utslib.for	1005 Communications Technologies	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - CCET - Centre for Clean Energy Technology
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	338	en_US

Abstract:

© 2014 Elsevier B.V. In this paper, the longitudinal optical conductivity in bilayer graphene was calculated analytically and numerically. In addition to the quadratic terms in the effective-mass approximation Hamiltonian, the linear term, which relates to the indirect interlayer coupling, was included. The nonparabolic energy dispersion was obtained. Two intra- and inter-band transition channels for optical transition via carriers absorbing the optical energy are observed. The inter-band transition offers the main contribution and is almost a constant when the optical energy is larger than two times the Fermi energy. In the presence of the complex energy and pseudospin angle relationship, doing the numerical integration to the wavevector k, the contribution of the intra-band optical transition to the optical conductivity (σxxintra(ω)) is strengthened in the low optical energy region, while the analytical results with parabolic energy curves contribute less to σxxintra(ω). In addition, the optical conductivity also depends on the electron density (or gate voltage) and the broadening width.

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http://hdl.handle.net/10453/41242