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Vanishing fine-structure splittings in telecommunication-wavelength quantum dots grown on (111)A surfaces by droplet epitaxy

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Title: Vanishing fine-structure splittings in telecommunication-wavelength quantum dots grown on (111)A surfaces by droplet epitaxy
Authors: Liu, Xiangming Browse this author
Ha, Neul Browse this author
Nakajima, Hideaki Browse this author
Mano, Takaaki Browse this author →KAKEN DB
Kuroda, Takashi Browse this author →KAKEN DB
Urbaszek, Bernhard Browse this author
Kumano, Hidekazu Browse this author →KAKEN DB
Suemune, Ikuo Browse this author →KAKEN DB
Sakuma, Yoshiki Browse this author →KAKEN DB
Sakoda, Kazuaki Browse this author →KAKEN DB
Issue Date: 27-Aug-2014
Publisher: American Physical Society
Journal Title: Physical Review B
Volume: 90
Issue: 8
Start Page: 081301-1
End Page: 081301-6
Publisher DOI: 10.1103/PhysRevB.90.081301
Abstract: The emission cascade of a single quantum dot is a promising source of entangled photons. A prerequisite for this source is the use of a symmetric dot analogous to an atom in a vacuum, but the simultaneous achievement of structural symmetry and emission in a telecom band poses a challenge. Here we report the growth and characterization of highly symmetric InAs/InAlAs quantum dots self-assembled on C3v symmetric InP(111)A. The broad emission spectra cover the O (λ∼1.3 μm), C (λ∼1.55 μm), and L (λ∼1.6 μm) telecom bands. The distribution of the fine-structure splittings is considerably smaller than those reported in previous works on dots at similar wavelengths. The presence of dots with degenerate exciton lines is further confirmed by the optical orientation technique. Thus, our dot systems are expected to serve as efficient entangled photon emitters for long-distance fiber-based quantum key distribution.
Rights: ©2014 American Physical Society
Type: article
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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