Direct observation of metastable hot trions in an individual quantum dot

Abstract

Magneto photoluminescence and excitation spectroscopy are used to probe the excited state spectrum of negatively charged trions in a InGaAs quantum dot. A single dot optical charging device allows us to selectively prepare specific few (1e, 2e) electron states and stabilize hot trions against decay via electron tunnelling from excited orbital states. The spin structure of the excited state results in the formation of metastable trions with strong optical activity that are directly observed in luminescence. Excitation spectroscopy is employed to map the excited singlet and triplet states of the two electron wavefunction and fine structure splittings are measured for the lowest lying and excited orbital states. Magneto-optical measurements allow us to compare the g-factors and diamagnetic response of different trion states.

References in corpus (4)

• Spins in few-electron quantum dots
• A Charge and Spin Readout Scheme For Single Self-Assembled Quantum Dots
• Probing spin relaxation in an individual InGaAs quantum dot using a single electron optical spin memory device
• Selective Optical Charge Generation, Storage and Readout in a Single Self Assembled Quantum Dot

Cited by in corpus (14)

• Three stage decoherence dynamics of electron spin qubits in an optically active quantum dot
• Quantum Fingerprints in Higher Order Correlators of a Spin Qubit
• All optical quantum control of a spin-quantum state and ultrafast transduction into an electric current
• Complexes of dipolar excitons in layered quasi-two-dimensional nanostructures
• Influence of quantum dot geometry on p-shell transitions in differently charged quantum dots
• Relative stability of excitonic complexes in quasi-one-dimensional semiconductors
• Charge tuning in [111] grown GaAs droplet quantum dots
• Nature and Control of Shakeup Processes in Colloidal Nanoplatelets
• Coherent population trapping combined with cycling transitions for quantum dot hole spins using triplet trion states
• Magneto-spectroscopy of excited states in charge-tunable GaAs/AlGaAs [111] quantum dots
• Statistical study of stacked/coupled site-controlled pyramidal quantum dots and their excitonic properties
• Configuration space method for calculating binding energies of exciton complexes in quasi-1D/2D semiconductors
• Selection rules for the excitation of quantum dots by spatially structured light beams -- Application to the reconstruction of higher excited exciton wave functions
• Trions and biexcitons in a nanowire