Tuning the carrier tunneling in a single quantum dot with a magnetic field in Faraday geometry

Abstract

We report on an increase in the carrier tunneling time in a single quantum dot (QD) with a magnetic field in Faraday geometry using photocurrent spectroscopy.A nearly 60% increase in hole tunneling time is observed with an applied magnetic field equal to 9 T. For a truncated pyramid QD, hole tunnels out faster at the lateral edge of the QD due to the reduced barrier height. The magnetic field in Faraday

Single charge control of localized excitons in heterostructures with ferroelectric thin films and two-dimensional transition metal dichalcogenides

“…The splitting is the result of FSS caused by anisotropic electron–hole exchange interactions in asymmetric confinement potentials. 48,49 However, in our experiments, singlets are mainly observed in the P down and P up regions. Due to the ferroelectric polarization of BFO, the density of negative charges in monolayer WSe 2 increases in the P up region, making it easier to produce negatively charged excitons (X − ), while the positively charged excitons (X + ) in the P down region are increased.…”

Electron and Hole g Tensors of Neutral and Charged Excitons in Single Quantum Dots by High-Resolution Photocurrent Spectroscopy

“…1(b). Through pumping-power-dependent PC measurements, the analysis of linewidth gives the typical electron tunneling time as several picoseconds with tunnel barrier height of about 60 meV [44,45]. The hole will then tunnel out of the QDs and contribute to a X 0 PC signal, as shown by the black solid points in Fig.…”