Direct measurement of spin dynamics in InAs/GaAs quantum dots using time-resolved resonance fluorescence

Lu, C. -Y., Zhao, Y., Vamivakas, A. N., Matthiesen, C., Fält, S., Badolato, A. and Atatüre, M. (2010) Direct measurement of spin dynamics in InAs/GaAs quantum dots using time-resolved resonance fluorescence. Physical Review B, 81(3), 035332. (doi: 10.1103/PhysRevB.81.035332)

Abstract

We temporally resolve the resonance fluorescence from an electron spin confined to a single self-assembled quantum dot to measure directly the spin’s optical initialization and natural relaxation time scales at 4 K. Our measurements demonstrate that spin initialization occurs on the order of microseconds in the Faraday configuration when a laser resonantly drives the quantum dot transition. We show that the mechanism mediating the optically induced spin-flip changes from electron-nuclei interaction to hole-mixing interaction at 0.6 T external magnetic field. Spin relaxation measurements result in times on the order of milliseconds and suggest that a B−5 magnetic field dependence, due to spin-orbit coupling, is sustained all the way down to 2.2 T.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Badolato, Professor Antonio
• Authors: Lu, C. -Y., Zhao, Y., Vamivakas, A. N., Matthiesen, C., Fält, S., Badolato, A., and Atatüre, M.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: Physical Review B
• Publisher: American Physical Society
• ISSN: 1098-0121
• ISSN (Online): 1550-235X