Dynamic nuclear polarization in a charged quantum dot induced by the AC Stark effect

T. A. Wilkinson; D. J. Cottrill; J. M. Cramlet; C. E. Maurer; C. J. Flood; A. S. Bracker; M. Yakes; D. Gammon; E. B. Flagg

doi:10.1117/12.2529455

3 September 2019 Dynamic nuclear polarization in a charged quantum dot induced by the AC Stark effect

T. A. Wilkinson, D. J. Cottrill, J. M. Cramlet, C. E. Maurer, C. J. Flood, A. S. Bracker, M. Yakes, D. Gammon, E. B. Flagg

Author Affiliations +

Proceedings Volume 11091, Quantum Nanophotonic Materials, Devices, and Systems 2019; 110910I (2019) https://doi.org/10.1117/12.2529455
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States

Abstract

The energy levels of an optically active quantum system can be shifted via the AC Stark effect by applying a strong, far-detuned laser. In addition to achieving a spin-selective AC Stark shift larger than 20 GHz, we observe a small Overhauser shift of approximately 1 GHz in a single negatively charged InGaAs quantum dot. We attribute this small shift to dynamic nuclear polarization via electron spin pumping induced by the high power, although far-detuned AC Stark laser. Low power scans reveal two regimes: high power where the frequency shift is linear in AC Stark laser power, and low power where the behavior is non-linear. Linewidth analysis provides a method to quantify the effect of the AC Stark laser on the nuclear spin environment, which in turn affects the quantum dot transitions.

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T. A. Wilkinson, D. J. Cottrill, J. M. Cramlet, C. E. Maurer, C. J. Flood, A. S. Bracker, M. Yakes, D. Gammon, and E. B. Flagg "Dynamic nuclear polarization in a charged quantum dot induced by the AC Stark effect", Proc. SPIE 11091, Quantum Nanophotonic Materials, Devices, and Systems 2019, 110910I (3 September 2019); https://doi.org/10.1117/12.2529455

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