Effect of detuning on the phonon induced dephasing of optically driven InGaAs/GaAs quantum dots

  title={Effect of detuning on the phonon induced dephasing of optically driven InGaAs/GaAs quantum dots},
  author={Andrew J. Ramsay and T. M. Godden and Stephen J. Boyle and Erik M. Gauger and Ahsan Nazir and Brendon W. Lovett and Achanta Venu Gopal and A. Mark Fox and M. S. Skolnick},
  journal={Journal of Applied Physics},
Recently, longitudinal acoustic phonons have been identified as the main source of the intensity damping observed in Rabi rotation measurements of the ground-state exciton of a single InAs/GaAs quantum dot. Here we report experiments of intensity damped Rabi rotations in the case of detuned laser pulses. The results have implications for the coherent optical control of both excitons and spins using detuned laser pulses. 

Figures from this paper

Suppression of decoherence tied to electron-phonon coupling in telecom-compatible quantum dots: low-threshold reappearance regime for quantum state inversion.
We demonstrate suppression of dephasing tied to deformation potential coupling of confined electrons to longitudinal acoustic (LA) phonons in optical control experiments on large semiconductor
Lindblad theory of dynamical decoherence of quantum-dot excitons
We use the Bloch-Redfield-Wangsness theory to calculate the effects of acoustic phonons in coherent control experiments where quantum-dot excitons are driven by shaped laser pulses. This theory
The role of phonons for exciton and biexciton generation in an optically driven quantum dot.
This review discusses the influence of phonons on three basically different optical excitation schemes that can be used for the preparation of exciton, biexciton and superposition states and compares the performance of the schemes for state preparation.
Dynamic vibronic coupling in InGaAs quantum dots [Invited]
The electron–phonon coupling in self-assembled InGaAs quantum dots is relatively weak at low light intensities, which means that the zero-phonon line in emission is strong compared to the phonon
Phonon Effects on Population Inversion in Quantum Dots: Resonant, Detuned and Frequency-Swept Excitations
The effect of acoustic phonons on different light-induced excitations of a semiconductor quantum dot is investigated. Resonant excitation of the quantum dot leads to Rabi oscillations, which are
Spectrally-modified frequency-swept pulses for optically-driven quantum light sources
We present a driving scheme for solid-state quantum emitters using frequency-swept pulses con-taining a spectral hole resonant with the optical transition in the emitter. Our scheme enables
Quantum dot-cavity systems
This thesis presents experiments carried out on a single InGaAs/GaAs quantum dot coupled with a photonic crystal cavity (H1). The single exciton qubit system is controlled by ultrafast optical
Probing bath-induced entanglement in a qubit pair by measuring photon correlations
Self-assembled quantum dots are ideal structures in which to test theories of open quantum systems: Confined exciton states can be coherently manipulated and their decoherence properties are
Influence of a phonon bath in a quantum dot cavity QED system: Dependence of the shape
We present a systematic analysis on the role of the quantum dot (QD) shape in the influence of the phonon bath on the dynamics of a QD cavity QED system. The spectral functions of the phonon bath in
Experimental Quantification of the Robustness of Adiabatic Rapid Passage for Quantum State Inversion in Semiconductor Quantum Dots
A. RAMACHANDRAN,1 J. FRASER-LEACH,1 S. O’NEAL,2,3 D. G. DEPPE,2,4 AND K. C. HALL1,∗ 1Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada 2The


Damping of exciton Rabi rotations by acoustic phonons in optically excited InGaAs/GaAs quantum dots.
We report experimental evidence identifying acoustic phonons as the principal source of the excitation-induced-dephasing (EID) responsible for the intensity damping of quantum dot excitonic Rabi
Phonon-induced Rabi-frequency renormalization of optically driven single InGaAs/GaAs quantum dots.
It is demonstrated that the observed renormalization of the Rabi frequency is induced by fluctuations in the bath of longitudinal acoustic phonons, an effect that is a phonon analogy of the Lamb shift.
Resonant nature of phonon-induced damping of Rabi oscillations in quantum dots
Optically controlled coherent dynamics of charge (excitonic) degrees of freedom in a semiconductor quantum dot under the influence of lattice dynamics (phonons) is discussed theoretically. We show
Phonon-assisted damping of Rabi oscillations in semiconductor quantum dots.
Rabi oscillations renormalized and a damping that depends on the input pulse strength, a behavior not known from exponential dephasing mechanisms are found.
The role of acoustic phonons for Rabi oscillations in semiconductor quantum dots
The damping of Rabi oscillations in quantum dots as well as the renormalization of the carrier-light coupling, due to the interaction with longitudinal acoustic phonons are studied as a function of
Quantum control of electron-phonon scatterings in artificial atoms.
It is shown that appropriate tailoring of laser pulses allow complete control of the optical excitation despite the phonon dephasing, a finding in marked contrast to other environment couplings.
Heat pumping with optically driven excitons
We present a theoretical study showing that an optically driven excitonic two-level system in a solid-state environment can act as a heat pump by means of repeated phonon emission or absorption
Optical Stark effect in a quantum dot: ultrafast control of single exciton polarizations.
The first experimental study of the optical Stark effect in single semiconductor quantum dots (QD) is reported, which can be understood as rotations of the QD polarization phase with negligible population change.
Nonmonotonic field dependence of damping and reappearance of Rabi oscillations in quantum dots.
It is found that the phonon-induced damping of Rabi rotations is a nonmonotonic function of the laser field that is increasing at low fields and decreasing at high fields, which results in a reappearance of RBI rotations at high field.
Reducing decoherence of the confined exciton state in a quantum dot by pulse-sequence control
We study the phonon-induced dephasing of the exciton state in a quantum dot excited by a sequence of ultra-short pulses. We show that the multiple-pulse control leads to a considerable improvement of