Observation of bound and antibound states of two excitons in GaAs single quantum well by two-dimensional coherent spectroscopy
Observation of bound and antibound states of two excitons in GaAs single quantum well by two-dimensional coherent spectroscopy
复制标题
二维相干光谱观察GaAs单量子阱中两个激子的束缚态和反束缚态
DOI：
10.1103/physrevb.95.201113
复制
发表时间：
2017
影响因子：
3.7
通讯作者：
Y. Ogawa
中科院分区：
文献类型：
--
作者：
Tadahiko Ishikawa;Ryosuke Hosoda;Yoichi Okimoto;Sei’ichi Tanaka;Ken Onda;Shinya Koshihara;and Reiji Kumai;T. Ishikawa,T. Okazaki,D. Nishida,Y. Sudo,Y. Okimoto,S. Koshihara,M. Hada,A. Miyawaki,K. Takahashi;佐野 史弥,後藤 崇臣,石川 忠彦,沖本 洋一,腰原 伸也,杜 毅楠,高橋 優介,高坂 亘,宮坂 等;Y. Ogawa
本文用二维相干谱研究了GaAs单量子阱中两个激子的束缚态和反束缚态。我们还提出了一种利用外差干涉技术，通过同步检测干涉信号，直接观测光场的振幅和相位（真实的和虚部）的方法。在该方案中，不稳定的干涉仪的机械波动不影响测量。此外，光与物质相干相互作用产生的光场的振幅和相位，直接通过比较参考外差拍频信号，通过使用一个两相锁定放大器。用这种方法观察到了两个激子的束缚态和反束缚态。激子被局域在量子岛上，并且横向限制导致两个激子之间的大的排斥能。
We study the bound and antibound states of two excitons in a GaAs single quantum well by two-dimensional coherent spectroscopy. We also propose a method to directly observe the amplitude and phase (real and imaginary parts) of optical fields by using a heterodyne interference technique and through synchronized detection of the interference signals. In this scheme, the mechanical fluctuation of an unstabilized interferometer does not affect the measurement. In addition, the amplitude and phase of the optical fields, resulting from the coherent interactions between light and matter, are directly obtained by comparing a reference heterodyne beating signal by using a two-phase lock-in amplifier. By using this method, the bound and antibound states of two excitons are observed. It is expected that the excitons are localized to the quantum islands and the lateral confinement induces the large repulsive energy between the two excitons.