High fidelity optical readout of excited-state lifetimes and ionization of hydrogenic donors in GaAs

Allen, D. G., Kim, S., Stanley, C. R. and Sherwin, M. S. (2008) High fidelity optical readout of excited-state lifetimes and ionization of hydrogenic donors in GaAs. Applied Physics Letters, 93(18), (doi: 10.1063/1.3020222)

Abstract

Optical detection of terahertz-frequency Rydberg transitions of neutral donors in GaAs is demonstrated via state-dependent resonance fluorescence from the neutral donor bound exciton ((DX)-X-0) transition. The intensity of the elastically scattered light is proportional to the fraction of donor-bound electrons in the (bright) ground state; excited state and ionized donors are dark. Resonance fluorescence recovery after terahertz excitation yields a single-shot, time-resolved measurement of the lifetime of the lowest excited (2P(-)) state. We also demonstrate contactless detection of electron ionization/capture via the ionized donor exciton (D+X) transition.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Stanley, Professor Colin
• Authors: Allen, D. G., Kim, S., Stanley, C. R., and Sherwin, M. S.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: Applied Physics Letters
• ISSN: 0003-6951