Peculiar spectra of dark and bright excitons in alloyed nanowire quantum dots

Abstract

Excitons in alloyed nanowire quantum dots have unique spectra as shown here using atomistic calculations. The bright exciton splitting is triggered solely by alloying and despite cylindrical quantum dot shape reaches over $15\mu$eV, contrary to previous theoretical predictions, however, in line with experimental data. This splitting can however be tuned by electric field to go below $1$~$\mu$eV threshold. The dark exciton optical activity is also strongly affected by alloying reaching notable $1/3500$ fraction of the bright exciton and having large out-of-plane polarized component.

5 figures, 4 pages (plus bibliography)

References in corpus (16)

• Entangled Photon Pairs from Semiconductor Quantum Dots
• Coherent Population Trapping of an Electron Spin in a Single Negatively Charged Quantum Dot
• Observation of strongly entangled photon pairs from a nanowire quantum dot
• 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
• Magnetic-field-induced reduction of the exciton polarization splitting in InAs quantum dots
• Inversion of exciton level splitting in quantum dots
• Highly entangled photons from hybrid piezoelectric-semiconductor quantum dot devices
• Polarization entangled photons from quantum dots embedded in nanowires
• Determinisitic Writing and Control of the Dark Exciton Spin using Short Single Optical Pulses
• Hyper-entanglement of photons emitted by a quantum dot
• Atomistic theory of dark excitons in self-assembled quantum dots of reduced symmetry
• Telecom wavelength single quantum dots with very small excitonic fine-structure splitting
• In-plane radiative recombination channel of a dark exciton in self-assembled quantum dots
• Linear scaling approach for atomistic calculation of excitonic properties of 10-million-atom nanostructures
• Coherent coupling of dark and bright excitons with vibrational strain

Cited by in corpus (2)

• Atomistic theory of electronic and optical properties of InAsP/InP nanowire quantum dots
• Dark-bright excitons mixing in alloyed InGaAs self-assembled quantum dots