Electronic Structure, Manybody Effects and Phonon-assisted Dynamics in Semiconductor Quantum Dots
Moritz Cygorek
Quantum Theory Group, University of Ottawa, Canada
Quantum dots are key devices for quantum technologies. Because of their strong interaction with light, quantum dots can serve as single-photon sources or as emitters of entangled photon pairs. As novel fabrication techniques enable an unprecedented degree of control over the shapes and sizes of semiconductor nanostructures, there is a demand for tools to theoretically predict how changes in their geometry influence their electronic and optical properties.
Here, I present QNANO, an atomistic million-atom electronic structure simulation framework for semiconductors and 2D materials based on the tight-binding and configuration-interaction approach, and show how it can be used as a predictive tool to model the electronic and optical properties of excitonic complexes and multi-electron systems in nanowire quantum dots. Moreover, I report on the ultrafast dynamics in laser-driven semiconductor quantum dots in optical microcavities as sources of non-classical light, where the non-perturbative coupling to phonons, simulated using a numerically exact real-time path-integral method, turns out to have both detrimental and beneficial aspects for applications.
The following lectures will take place during the integrated seminar in winter term 2019/20:
date | theme | lecturer
16.10.2019 Spectroscopic investigations of plasmons in nanostructures
Maximilian Denning
23.10.2019 Adabatic rapid passage in quantum dots
Jan Kaspari
30.10.2019 Measuring phonons of nanostructures using electron energy loss spectroscopy
Maximilian Grove
13.11.2019 Electronic Structure, Manybody Effects and Phonon-assisted Dynamics in Semconductor Quantum Dots
Moritz Cygorek (Quantum Theory Group, University of Ottawa, Canada)
20.11.2019 Simulation of STM images
Alex Oster
04.12.2019 Electronical and optical properties of TMDC monolayers based on a model Hamiltonian
Fabio Stüber
15.01.2020 2D materials in high magnetic fields
Leonhard Segger
22.01.2020 Single-photon emitters in hBN
Madeleine Stieg
29.01.2020 Twisted bilayer graphene: electronic properties
Jennifer Borcherding
Moiré effect at interlayer excitons in vdW heterostructures
Wurstbauer
[DOI: 10.1038/s41567-019-0631-4]
Recovering the valley polarization in MoS2 monolayers at 300K by controlling the exciton-phonon interaction
Wurstbauer
[DOI: 10.1038/s41467-019-08764-3]
