Study on energy-level fluctuation of two-level system in semiconductor nanostructures

2014 Fiscal Year Final Research Report

• Project/Area Number: 24310084
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Nanostructural science
• Research Institution: Hokkaido University
• Principal Investigator: KUMANO HIDEKAZU 北海道大学, 電子科学研究所, 准教授 (70292042)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 量子ドット / 量子情報 / 量子光源 / 荷電状態制御 / 光子相関測定

Outline of Final Research Achievements

I have fabricated single photon sources with a single InAs quantum dot (QD), and its carrier dynamics were investigated. Originally introduced metal microcolumnar structure have enhanced the photon extraction efficiency up to 18 % from conventionally obtained 1% with planar structure.
Charge states formed in the QD were modeled with 5-level system, and by comparing simulated time-evolution of the population with experimentally obtained correlation functions, I have successfully reproduced the carrier dynamics. This finding is crucial for controlling the carrier dynamics characterizing quantum photon sources.

Free Research Field

半導体ナノ構造