Narrow optical linewidths and spin pumping on charge-tunable close-to-surface self-assembled quantum dots in an ultrathin diode
نویسندگان
چکیده
Matthias C. Löbl,1 Immo Söllner,1 Alisa Javadi,2 Tommaso Pregnolato,2 Rüdiger Schott,3 Leonardo Midolo,2 Andreas V. Kuhlmann,1,4 Søren Stobbe,2 Andreas D. Wieck,3 Peter Lodahl,2 Arne Ludwig,3 and Richard J. Warburton1 1Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland 2Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, Copenhagen DK-2100, Denmark 3Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany 4IBM Research-Zurich, Säumerstrasse 4, 8803 Rüschlikon, Switzerland (Received 20 July 2017; revised manuscript received 10 October 2017; published 30 October 2017)
منابع مشابه
Optical pumping of the electronic and nuclear spin of single charge-tunable quantum dots.
We present a comprehensive examination of optical pumping of spins in individual GaAs quantum dots as we change the net charge from positive to neutral to negative with a charge-tunable heterostructure. Negative photoluminescence polarization memory is enhanced by optical pumping of ground state electron spins, which we prove with the first measurements of the Hanle effect on an individual quan...
متن کاملResonant photon-exciton interaction in semiconductor quantum dots
Semiconductor self-assembled quantum dots form a three dimensional confinement for charge carriers in the solid state matrix. The confinement modifies the density of states, leading to atom like optical properties of quantum dots that can be studied by absorption or emission of photons. Due to the sharp resonance lines that are observed in optical spectra, quantum dots are often referred to as ...
متن کاملLeveraging crystal anisotropy for deterministic growth of InAs quantum dots with narrow optical linewidths.
Crystal growth anisotropy in molecular beam epitaxy usually prevents deterministic nucleation of individual quantum dots when a thick GaAs buffer is grown over a nanopatterned substrate. Here, we demonstrate how this anisotropy can actually be used to mold nucleation sites for single dots on a much thicker buffer than has been achieved by conventional techniques. This approach greatly suppresse...
متن کاملSpin Lifetime in Electron-Doped InP Quantum Dots
Spin relaxation of electrons doped in InP quantum dots was studied by means of luminescence pump-probe and Hanle measurements. Optical pumping makes spins of doped electrons to be oriented in parallel to the helicity of the circularly polarized excitation. The luminescence pump-probe showed the spin orientation of the doped electrons decay on a millisecond time-scale. Hanle measurement clarifie...
متن کاملPulsed nuclear pumping and spin diffusion in a single charged quantum dot.
We report the observation of a feedback process between the nuclear spins in a single charged quantum dot under coherently pulsed optical excitation and its trion transition. The optical pulse sequence intersperses resonant narrow-band pumping for spin initialization with off-resonant ultrafast pulses for coherent electron-spin rotation. A hysteretic sawtooth pattern in the free-induction decay...
متن کامل