Exciton Rabi oscillation in GaAs quantum dots

GaAs 量子点中的激子拉比振荡

• 批准号: 15340093
• 负责人: MINAMI Fujio
• 金额: $ 10.69万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15340093/
• 关键词: photon echo; Rabi oscillation; quantum dot; exciton; GaAs; dephasing; 非マルコフ過程

We performed the photon echo experiment on GaAs quantum dots at 5K. The excitation light source was a fs Ti-Sapphire laser. The excitation photon energy was tuned to cover the lowest exciton in GaAs quantum dots. A dominant signal is observed at the zero time delay, which is due to photon echoes from the GaAs substrate and is unrelated to the quantum dots. For longer delays, we can observe a slowly decaying signal with a time constant of 〜1 ns. This signal is due to the dephasing of the exciton coherence in the quantum dots. Therefore, it can be concluded that the dephasing time of the exciton is extremely long (〜1 ns) in the quantum dots as compared to that in usual quantum wells (〜1ps).When changing the exciting pulse power, the signal intensity of the photon echo varys greatly. The echo intensity is found to oscilate as the excitation power increases. It can be understood that this oscillation is analogous to the Rabi oscillation, which is observed in resonantly driven two level systems. It is therefore considered that we observed the Rabi oscillation of the exciton in the quantum dots. It is noted that the Rabi oscillation can be observed under relatively low excitation power. Because the Rabi oscillation is an essential phenomenon to rotate q-bit, this result shows that the semiconductor quantum dots are promising as the logical circuit material of the quantum computing.

我们在5K的GAAS量子点上进行了光子实验〜1 ns的时间竞赛是由于量子点中的激子连贯性的作用。当更改令人兴奋的脉冲功率时，随着激发能力的增加，这种污垢与Rabi振荡相似激发能力。

项目成果

Multi-wave-mixing of two-dimensional excitons in semiconductors

半导体中二维激子的多波混合

• 发表时间: 2004
• 期刊: J.Lumin. 108
• 作者: A.Hasegawa;T.Kishimoto;Y.Mitsumori;F.Minami
• 通讯作者: F.Minami

Acoustical phonon broadening of the exciton line in semiconductor single quantum dots

半导体单量子点中激子线的声学声子展宽

• 发表时间: 2004
• 期刊: J.Lumin. 108
• 作者: K.Ikeda;F.Minami;S.Kuroda;K.Takita
• 通讯作者: K.Takita

T.Komori, T.Ishikawa, J.Yoshino, F.Minami, S.Koshihara: "Carrier-density dependence of magnetic and magneto-optical properties of (Ga, Mn)As"Physical Review B. 67. 115203 (2003)

T.Komori、T.Ishikawa、J.Yoshino、F.Minami、S.Koshihara：“(Ga, Mn)As 的磁和磁光特性的载流子密度依赖性”物理评论 B. 67. 115203 (2003)

S.Sanguinetti, M.Gurioli, T.Kuroda, K.Watanabe, F.Minami: "Carrier relaxation in quantum dots without wetting layer"Physica E. 17. 91-93 (2003)

S.Sanguinetti、M.Gurioli、T.Kuroda、K.Watanabe、F.Minami：“没有润湿层的量子点中的载流子弛豫”Physica E. 17. 91-93 (2003)

A.Hasegawa, T.Kishimoto, Y.Mitsumori, M.Sasaki, F.Minami: "Temporal Behavior of Quantum Interfered Polarization between Two Excitons"Proc.26th Int.Conf.Semicond.Phys.. 44 (2003)

A.Hasekawa、T.Kishimoto、Y.Mitsumori、M.Sasaki、F.Minami：“两个激子之间量子干涉偏振的时间行为”Proc.26th Int.Conf.Semicond.Phys.. 44 (2003)