Exciton energy oscillations induced by quantum beats
arXiv:2003.08143 · doi:10.1103/PhysRevB.102.205303
Abstract
In this paper, we experimentally demonstrate an oscillating energy shift of quantum-confined exciton levels in a semiconductor quantum well after excitation into a superposition of two quantum confined exciton states of different parity. Oscillations are observed at frequencies corresponding to the quantum beats between these states. We show that the observed effect is a manifestation of the exciton density oscillations in the real space similar to the dynamics of a Hertzian dipole. The effect is caused by the exciton-exciton exchange interaction and appears only if the excitons are in a superposition quantum state. Thus, we have found clear evidence for the incoherent exchange interaction in the coherent process of quantum beats. This effect may be harnessed for quantum technologies requiring the quantum coherence of states.
arXiv comment6 pages, 4 figures
References in corpus (10)
- Analysis of the exciton-exciton interaction in semiconductor quantum wells
- Observation of exciton redshift-blueshift crossover in monolayer WS2
- Light Engineering of the Polariton Landscape in Semiconductor Microcavities
- Pump-Probe Faraday Rotation and Ellipticity in an Ensemble of Singly Charged Quantum Dots
- Nontrivial relaxation dynamics of excitons in high-quality InGaAs/GaAs quantum wells
- Excitons in asymmetric quantum wells
- Observation of Non-equilibrium Motion and Equilibration in Polariton Rings
- Theory of optical spin control in quantum dot microcavities
- Nanosecond-scale magneto-exciton energy oscillations in quantum wells
- Multiple quantum beats of quantum confined exciton states in InGaAs/GaAs quantum well