Nuclear feedback in a single electron-charged quantum dot under pulsed optical control

Thaddeus D. Ladd; David Press; Kristiaan De Greve; Peter L. McMahon; Benedikt Friess; Christian Schneider; Martin Kamp; Sven Höfling; Alfred Forchel; Yoshihisa Yamamoto

doi:10.1117/12.873978

12 February 2011 Nuclear feedback in a single electron-charged quantum dot under pulsed optical control

Thaddeus D. Ladd, David Press, Kristiaan De Greve, Peter L. McMahon, Benedikt Friess, Christian Schneider, Martin Kamp, Sven Höfling, Alfred Forchel, Yoshihisa Yamamoto

Author Affiliations +

Proceedings Volume 7948, Advances in Photonics of Quantum Computing, Memory, and Communication IV; 79480U (2011) https://doi.org/10.1117/12.873978
Event: SPIE OPTO, 2011, San Francisco, California, United States

Abstract

Electron spins in quantum dots under coherent control exhibit a number of novel feedback processes. Here, we present experimental and theoretical evidence of a feedback process between nuclear spins and a single electron spin in a single charged InAs quantum dot, controlled by the coherently modified probability of exciting a trion state. We present a mathematical model describing competition between optical nuclear pumping and nuclear spin-diffusion inside the quantum dot. The model correctly postdicts the observation of a hysteretic sawtooth pattern in the free-induction-decay of the single electron spin, hysteresis while scanning a narrow-band laser through the quantum dot's optical resonance frequency, and non-sinusoidal fringes in the spin echo. Both the coherent electron-spin rotations, implemented with off-resonant ultrafast laser pulses, and the resonant narrowband optical pumping for spin initialization interspersed between ultrafast pulses, play a role in the observed behavior. This effect allows dynamic tuning of the electron Larmor frequency to a value determined by the pulse timing, potentially allowing more complex coherent control operations.

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Thaddeus D. Ladd, David Press, Kristiaan De Greve, Peter L. McMahon, Benedikt Friess, Christian Schneider, Martin Kamp, Sven Höfling, Alfred Forchel, and Yoshihisa Yamamoto "Nuclear feedback in a single electron-charged quantum dot under pulsed optical control", Proc. SPIE 7948, Advances in Photonics of Quantum Computing, Memory, and Communication IV, 79480U (12 February 2011); https://doi.org/10.1117/12.873978

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KEYWORDS

Polarization

Optical pumping

Diffusion

Mathematical modeling

Quantum dots

Ultrafast phenomena

Magnetism

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