Phonon impact on optical control schemes of quantum dots: The role of quantum dot geometry and symmetry

Abstract

Phonons strongly influence the optical control of semiconductor quantum dots. When modeling the electron-phonon interaction in several theoretical approaches the quantum dot geometry is approximated by a spherical structure, though typical self-assembled quantum dots are strongly lens-shaped. By explicitly comparing simulations of a spherical and a lens-shaped dot using a well-established correlation expansion approach we show that indeed lens-shaped dots can be exactly mapped to a spherical geometry when studying the phonon influence on the electronic system. We also give a recipe to reproduce spectral densities from more involved dots by rather simple spherical models. On the other hand, breaking the spherical symmetry has a pronounced impact on the spatio-temporal properties of the phonon dynamics. As an example we show that for a lens-shaped quantum dot the phonon emission is strongly concentrated along the direction of the smallest axis of the dot which is important for the use of phonons for the communication between different dots.

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Cited by in corpus (24)

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• From strong to weak temperature dependence of the two-photon entanglement resulting from the biexciton cascade inside a cavity
• Acoustic Phonon Sideband Dynamics During Polaron Formation in a Single Quantum Dot
• Highly efficient and indistinguishable single-photon sources via phonon-decoupled two-color excitation
• Giant photoelasticity of polaritons for detection of coherent phonons in a superlattice with quantum sensitivity
• Beyond the four-level model: Dark and hot states in quantum dots degrade photonic entanglement
• Four-wave mixing dynamics of a strongly coupled quantum-dot--microcavity system driven by up to 20 photons
• Suppression of Decoherence tied to Electron-Phonon Coupling in Telecom-Compatible Quantum Dots: Low-threshold Reappearance Regime for Quantum State Inversion
• Phonon wave packet emission during state preparation of a semiconductor quantum dot using different schemes
• The optical Stark shift to control the dark exciton occupation of a quantum dot in a tilted magnetic field
• Nanocavity enhanced photon coherence of solid-state quantum emitters operating up to 30 K
• Two-photon excitation with finite pulses unlocks pure dephasing-induced degradation of entangled photons emitted by quantum dots
• Compact Chirped Fiber Bragg Gratings for Single-Photon Generation from Quantum Dots
• Multiple Rabi rotations of trions in InGaAs quantum dots observed by photon echo spectroscopy with spatially shaped laser pulses
• Phonon-induced transition between entangled and nonentangled photon emission in constantly driven quantum-dot--cavity systems
• Controlling dephasing of coupled qubits via shared-bath coherence
• Deterministic photon storage and readout in a semimagnetic quantum-dot--cavity system doped with a single Mn ion
• Probing Complex Decoherence Processes in Materials for Quantum Applications
• Experimental measurement of the reappearance of Rabi rotations in semiconductor quantum dots
• Photon Number Coherence in Quantum Dot-Cavity Systems can be Enhanced by Phonons
• Phonon-assisted transport and hole-phonon coupling in GaAs double quantum dots
• Polaron effects on the information backflow in Jaynes-Cummings model
• Structured beam controlled super-resolution in quantum dots via rapid adiabatic passage