標題: Size-dependent line broadening in the emission spectra of single GaAs quantum dots: Impact of surface charge on spectral diffusion
作者: Ha, Neul
Mano, Takaaki
Chou, Ying-Lin
Wu, Yu-Nien
Cheng, Shun-Jen
Bocquel, Juanita
Koenraad, Paul M.
Ohtake, Akihiro
Sakuma, Yoshiki
Sakoda, Kazuaki
Kuroda, Takashi
電子物理學系
Department of Electrophysics
公開日期: 10-Aug-2015
摘要: Making use of droplet epitaxy, we systematically controlled the height of self-assembled GaAs quantum dots by more than one order of magnitude. The photoluminescence spectra of single quantum dots revealed the strong dependence of the spectral linewidth on the dot height. Tall dots with a height of similar to 30 nm showed broad spectral peaks with an average width as large as similar to 5 meV, but shallow dots with a height of similar to 2 nm showed resolution-limited spectral lines (<= 120 mu eV). The measured height dependence of the linewidths is in good agreement with Stark coefficients calculated for the experimental shape variation. We attribute the microscopic source of fluctuating electric fields to the random motion of surface charges at the vacuum-semiconductor interface. Our results offer guidelines for creating frequency-locked photon sources, which will serve as key devices for long-distance quantum key distribution.
URI: http://dx.doi.org/10.1103/PhysRevB.92.075306
http://hdl.handle.net/11536/128154
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.92.075306
期刊: PHYSICAL REVIEW B
Volume: 92
Issue: 7
起始頁: 0
結束頁: 0
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