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Single photon emission with high degree of circular polarization from a single quantum dot under zero magnetic field

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Title: Single photon emission with high degree of circular polarization from a single quantum dot under zero magnetic field
Authors: Kumano, H. Browse this author
Kobayashi, H. Browse this author
Hayashi, Y. Browse this author
Jo, M. Browse this author
Suemune, I. Browse this author →KAKEN DB
Sasakura, H. Browse this author
Adachi, S. Browse this author →KAKEN DB
Muto, S. Browse this author →KAKEN DB
Keywords: polarization conversion
Single quantum dot
single photon
charged exciton
spin flip
PACS=71.35.-y
PACS=72.25.Fe
PACS=72.25.Rb
PACS=78.67.Hc
Issue Date: Apr-2008
Publisher: Elsevier
Journal Title: Physica. E, Low-dimensional Systems and Nanostructures
Volume: 40
Issue: 6
Start Page: 1824
End Page: 1827
Publisher DOI: 10.1016/j.physe.2007.10.041
Abstract: Single photon emission with high degree of circular polarization (DCP) from a positively charged exciton (trion) state in a single quantum dot (QD) is demonstrated under zero magnetic field. Obtained high DCP as large as 0.6 is a clear manifestation of highly effective mutual polarization conversion between single photon and single electron spin. This finding also reveals that the spin relaxation is strongly suppressed during capture and thermalization processes and also in trion ground states in a quantum dot. Moreover, exciton charging state control is shown to be possible by modifying the electron capture probability through the excitation energy tuning, which leads to an exclusive formation of the positive trion in a QD.
Type: article (author version)
URI: http://hdl.handle.net/2115/34639
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 熊野 英和

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