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

Allen, D. G.; Kim, Sangwoo; Stanley, C. R.; Sherwin, M. S.
November 2008
Applied Physics Letters;11/3/2008, Vol. 93 Issue 18, p181903
Academic Journal
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 (D0X) 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.


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