Interdot spin transfer dynamics in laterally coupled excited spin ensemble of high-density InGaAs quantum dots

• Hiura, Satoshi

• Takeishi, Kazuki

• Urabe, Masayuki

• Itabashi, Kodai

• Takayama, Junichi

• Kiba, Takayuki

• Sueoka, Kazuhisa

• Murayama, Akihiro

Abstract

Interdot spin transfer dynamics is studied in a laterally coupled excited spin ensemble of high-density InGaAs quantum dots (QDs). We observe a rise time of the photoluminescence intensity of similar to 100 ps and a simultaneous increase in the spin polarization of the excited spin ensemble, indicating spin injection from higher-energy levels in smaller QDs. Moreover, this coupled ensemble exhibits decay properties of the spin polarization that vary with the excited spin density. This phenomenon can be quantitatively understood by considering interdot spin transfer into lower-energy levels of the surrounding QDs, where the transfer rate depends on the degree of state filling of each QD level. Published by AIP Publishing.

Journal

• Applied physics letters

  Applied physics letters 113 (2), 023104-, 2018-07-09

  American Institute of Physics (AIP)

Keywords

• Physics and Astronomy (miscellaneous)

Details

• CRID: 1050282677904378496
• NII Article ID: 120006650533
• DOI: 10.1063/1.5022641
• ISSN: 10773118
• ISSN: 00036951
• HANDLE: 2115/74910
• Web Site: https://pubs.aip.org/aip/apl/article-pdf/doi/10.1063/1.5022641/13513856/023104_1_online.pdf
• Text Lang: en
• Article Type: journal article
• Data Source:
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  • Crossref
  • CiNii Articles
  • KAKEN