Acoustic Phonon Sideband Dynamics During Polaron Formation in a Single Quantum Dot

Abstract

When an electron-hole pair is optically excited in a semiconductor quantum dot the host crystal lattice needs to adapt to the presence of the generated charge distribution. Therefore the coupled exciton-phonon system has to establish a new equilibrium, which is reached in the form of a quasiparticle called polaron. Especially, when the exciton is abruptly generated on a timescale faster than the typical lattice dynamics, the lattice displacement cannot follow adiabatically. Consequently, a rich dynamics on the picosecond timescale of the coupled system is expected. In this study we combine simulations and measurements of the ultrafast, coherent, nonlinear optical response, obtained by four-wave mixing spectroscopy, to resolve the formation of this polaron. By detecting and investigating the phonon sidebands in the four-wave mixing spectra for varying pulse delays and different temperatures we have access to the influence of phonon emission and absorption processes which finally result in the emission of an acoustic wave packet out from the quantum dot.

accepted in Optics Letters

References in corpus (5)

• Phonon-assisted emission and absorption of individual color centers in hexagonal boron nitride
• The role of phonons for exciton and biexciton generation in an optically driven quantum dot
• Phonon impact on optical control schemes of quantum dots: The role of quantum dot geometry and symmetry
• Zero-phonon linewidth and phonon satellites in the optical absorption of nanowire-based quantum dots
• Influence of excited state decay and dephasing on phonon quantum state preparation

Cited by in corpus (3)

• Resonant and phonon-assisted ultrafast coherent control of a single hBN color center
• Controlling Photoluminescence Spectra of hBN Color Centers by Selective Phonon-Assisted Excitation: A Theoretical Proposal
• Entropy Dynamics of Phonon Quantum States Generated by Optical Excitation of a Two-Level System