Characterization of the local charge environment of a single quantum dot via resonance fluorescence

Abstract

We study the photon-statistical behavior of resonance fluorescence from self-assembled InAs quantum dots (QDs) as a function of the density of free charge carriers introduced by an above band-gap laser. Second-order correlation measurements show bunching behavior that changes with aboveband laser power and is absent in purely above-band excited emission. Resonant photoluminescence excitation spectra indicate that the QD experiences discrete spectral shifts and continuous drift due to changes in the local charge environment. These spectral changes, combined with tunneling of charges from the environment to the QD, provide an explanation of the bunching observed in the correlations.

Building Blocks for Quantum Network Based on Group‐IV Split‐Vacancy Centers in Diamond

“…One advantage of possessing inversion symmetry is the guarantee of vanishing of permanent electric‐dipole moment, which leaves split‐vacancy centers insensitive to the first‐order Stark shift caused by the local electric‐field fluctuations in the environment . Lack of susceptibilities helps mitigate the spectral diffusion experienced by the system, allowing for the observation of nearly lifetime‐limited linewidth as reported by multiple groups, and the realization of transform‐limited linewidth on SiV − , GeV − , and SnV − color centers.…”

Self‐Assembled InAs/GaAs Coupled Quantum Dots for Photonic Quantum Technologies

“…Spectral diffusion originates from the change of occupancies of the trap states around a QD. Solutions to such a problem include reducing the amount of current flowing through a single QD, or using optical pumping to overpopulate the charges in those states . After presenting an introduction and review of the band structure and single particle states, we will discuss some of the results relevant to overcoming the FSS and spectral inhomogeneities.…”

Polarization-Dependent Interference of Coherent Scattering from Orthogonal Dipole Moments of a Resonantly Excited Quantum Dot

“…Some examples are the Mollow triplet emission from dressed states of a 2-level quantum system [5][6][7], and the related Mollow quintuplet from dressed states of a V-system [8]. The selectivity and precision of resonant excitation have also allowed the production of highindistinguishability photons [9,10], and measurement of charge and spin fluctuations in the local solid state environment [11][12][13]. Many resonant excitation experiments use crossed polarizers to attenuate the laser scattering and allow detection of the resonance fluorescence [10][11][12][14][15][16].…”

“…Multiple RPLE spectra are recorded using different detection polarizations under the same excitation polarization. Rather than using crossed polarizers to discriminate between fluorescence and laser scattering [14,15], we instead use modal discrimination between the waveguide mode and the Fabry-Perot mode of the planar microcavity [6][7][8]13]. A resonant laser with a 1 MHz linewidth is coupled into the waveguide mode through the cleaved edge of the sample.…”

“…Therefore, the variation of ω 2 /2π and ω 1 /2π shown in Figs. 4(a-b) reflects the fluctuations of the local environment caused by the resonant excitation laser [13]. Further discussion on these fluctuations is given in Section 6 of the Supplementary Material [24].…”