Abstract
We report on the spin and occupation noise of a single, positively charged (InGa)As quantum dot emitting photons in the telecommunication C-band. The spin noise spectroscopy measurements are carried out at a temperature of 4.2 K in dependence on intensity and detuning in the regime beyond thermal equilibrium. The spin noise spectra yield in combination with an elaborate theoretical model the hole-spin relaxation time of the positively charged quantum dot and the Auger recombination and the electron-spin relaxation time of the trion state. The extracted Auger recombination time of this quantum dot emitting at 1.55μm is comparable to the typical Auger recombination times on the order of a few μs measured in traditionally grown InAs/GaAs quantum dots emitting at around 900 nm.
Highlights
Semiconductor quantum dots (QDs) have attracted significant attention since they are potential solid-state candidates for spin-photon quantum devices1 and thereby prospective building blocks for future quantum information technologies.2 Single photon emission from InAs/GaAs QDs at around 900 nm has been established in this context especially during the last decade, but QDs with emission wavelengths at the so-called telecommunication C-band are even more promising from the device point of view
We report on the spin and occupation noise of a single, positively charged (InGa)As quantum dot emitting photons in the telecommunication C-band
The extracted Auger recombination time of this quantum dot emitting at 1:55 μm is comparable to the typical Auger recombination times on the order of a few μs measured in traditionally grown InAs/GaAs quantum dots emitting at around 900 nm
Summary
Semiconductor quantum dots (QDs) have attracted significant attention since they are potential solid-state candidates for spin-photon quantum devices and thereby prospective building blocks for future quantum information technologies. Single photon emission from InAs/GaAs QDs at around 900 nm has been established in this context especially during the last decade, but QDs with emission wavelengths at the so-called telecommunication C-band are even more promising from the device point of view. The optically excited trion can either relax via emission of a photon or via Auger recombination In the latter case, the native hole of the QD is excited out of the QD, the resonance of the QD shifts significantly, and the QD induced Kerr rotation signal at the probe laser wavelength becomes in very good approximation zero, i.e., the spin noise is switched off. The native hole of the QD is excited out of the QD, the resonance of the QD shifts significantly, and the QD induced Kerr rotation signal at the probe laser wavelength becomes in very good approximation zero, i.e., the spin noise is switched off This process of switching off the SN is in resonant SNS the typical measure for the Auger recombination rate. Thereby, a composite fit of all measured noise spectra in this work yields a more detailed understanding of a typical, state of the art C-band QD
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