Interwall screening and excitons in double-wall carbon nanotubes

Tomio, Yuh; Suzuura, Hidekatsu; Ando, Tsuneya

Physical Review B, 2012, 85(8), 085411

Permalink : https://hdl.handle.net/2115/48523

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アクセス権	open access
URI	https://hdl.handle.net/2115/48523
タイトル	Interwall screening and excitons in double-wall carbon nanotubes
著者	Tomio, Yuh ; Suzuura, Hidekatsu ; Ando, Tsuneya
著者名 Tomio, Yuh
著者名 Suzuura, Hidekatsu
著者名 Ando, Tsuneya
言語	英語
発行日	2012-02-15
出版者	American Physical Society
収録物名	Physical Review B
巻(号)	85(8)
ページ	085411
抄録	Exciton properties of double-wall carbon nanotubes are studied in the static screened Hartree-Fock approximation within a k・p scheme. The intrawall electron-hole interaction is largely suppressed by interwall screening effects. The suppression is sensitive to the effective interwall distance between the inner and outer tubes and reduces the exciton binding energy as well as the band gap. As a result, the exciton energy levels are redshifted from those in the single-wall tube with the same diameter. The energy shift of the ground exciton has little dependence on the tube diameter, in contrast to that of the excited excitons. In the case of a metallic outer and inner tube, excited exciton states in the semiconducting tube disappear due to strong screening.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	©2012 American Physical Society
PISSN	1098-0121
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1103/PhysRevB.85.085411