Tuning exciton and biexciton transition energies and fine structure splitting through hydrostatic pressure in single InGaAs quantum dots

Abstract

We demonstrate that the exciton and biexciton emission energies as well as exciton fine structure splitting (FSS) in single (In,Ga)As/GaAs quantum dots (QDs) can be efficiently tuned using hydrostatic pressure in situ in an optical cryostat at up to 4.4 GPa. The maximum exciton emission energy shift was up to 380 meV, and the FSS was up to 180 $\mu$eV. We successfully produced a biexciton antibinding-binding transition in QDs, which is the key experimental condition that generates color- and polarization-indistinguishable photon pairs from the cascade of biexciton emissions and that generates entangled photons via a time-reordering scheme. We perform atomistic pseudopotential calculations on realistic (In,Ga)As/GaAs QDs to understand the physical mechanism underlying the hydrostatic pressure-induced effects.

References in corpus (9)

• Interference of Single Photons from Two Separate Semiconductor Quantum Dots
• Electric-field-induced coherent coupling of the exciton states in a single quantum dot
• Manipulating exciton fine-structure in quantum dots with a lateral electric field
• Inversion of exciton level splitting in quantum dots
• Coherence of an Entangled Exciton-Photon State
• Entanglement on demand through time reordering
• Electro-elastic tuning of single particles in individual self-assembled quantum dots
• Conquer the fine structure splitting of excitons in self-assembled InAs/GaAs quantum dots via combined stresses
• Exciton fine-structure splitting of telecom wavelength single quantum dots: statistics and external strain tuning

Cited by in corpus (2)

• Energy-tunable sources of entangled photons: a viable concept for solid-state-based quantum relays
• Towards scalable entangled photon sources with self-assembled InAs/GaAs quantum dots