[14p-E205-1~14] 13.7 Nano structures and quantum phenomena

▼ [14p-E205-1] Analysis on Optically-detected Electron Spin Resonance
in Single Self-Assembled Quantum Dots

〇(D)CheeFai Fong^1,3, Evgeny Chekhovich⁴, Ata Ulhaq⁴, Maurice Skolnick⁴, Yasutomo Ota^2,3, Satoshi Iwamoto^1,2,3, Yasuhiko Arakawa^1,2,3 (1.Inst. of Industrial Science, 2.Nanoquine, 3.Univ. of Tokyo, 4.Univ. of Sheffield)

Keywords:Quantum Dot, Electron spin, Resonance fluorescence

An electron spin trapped in a self-assembled quantum dot (QD) can form a robust qubit. Electron spin resonance (ESR) induced by radiation of microwave field has been utilized for coherent control and detailed analysis of the QD spin.Optically detected ESR in single QDs has been reported Kroner at al. Phys. Rev. Lett. 100, 156803 (2008) in which the electron spin rotation is detected from the intensity of the resonance fluorescence signal. While this novel method provides an a faster alternative to electrical detection of electron spin, there were aspects of the results which were not fully understood in the previously-reported optical QD ESR models [3]. In this work, we attempt to perform a more comprehensive physical modeling of the optically-detected QD ESR by using a 4-level system expressing a negatively charge trion, X^-. In our numerical simulations, we reproduced the basic features of the optically detected ESR, together with the observation of possible effects of optical and microwave co-excitation, giving an additional peak in the ESR spectra.