S
Stefan Schumacher
Researcher at University of Paderborn
Publications - 151
Citations - 2008
Stefan Schumacher is an academic researcher from University of Paderborn. The author has contributed to research in topics: Polariton & Exciton. The author has an hindex of 24, co-authored 132 publications receiving 1629 citations. Previous affiliations of Stefan Schumacher include University of Bremen & University of Arizona.
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Tight-binding model for semiconductor quantum dots with a wurtzite crystal structure: From one-particle properties to Coulomb correlations and optical spectra
TL;DR: In this article, Coulomb and dipole matrix elements are calculated from the one-particle wave functions which fully include the atomistic wurtzite structure of the low-dimensional heterostructures and serve as an input for the calculation of optical spectra.
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How intermolecular geometrical disorder affects the molecular doping of donor–acceptor copolymers
Daniele Di Nuzzo,Claudio Fontanesi,Rebecca M. A. Jones,Sybille Allard,Ines Dumsch,Ullrich Scherf,Elizabeth von Hauff,Stefan Schumacher,Enrico Da Como +8 more
TL;DR: This work investigates how charge transfer between dopant and donor-acceptor copolymers is affected by the spatial arrangement of the dopant molecule with respect to the copolymer repeat unit, and finds that efficient charge transfer occurs only when the dopants is close to the donor moiety.
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Creation and Manipulation of Stable Dark Solitons and Vortices in Microcavity Polariton Condensates.
TL;DR: The present work demonstrates the existence of stable dark solitons and vortices under nonresonant incoherent excitation of a polariton condensate with a simple spatially periodic pump and shows that an additional coherent light pulse can be used to create or destroy a dark soliton in a controlled manner.
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Charge photogeneration in donor-acceptor conjugated materials: influence of excess excitation energy and chain length.
Raphael Tautz,Enrico Da Como,Christian Wiebeler,Giancarlo Soavi,Ines Dumsch,Nils Fröhlich,Giulia Grancini,Sybille Allard,Ullrich Scherf,Giulio Cerullo,Stefan Schumacher,Jochen Feldmann +11 more
TL;DR: It is shown that excitation in high-energy states generates electron and hole wave functions with reduced overlap, which likely act as precursors for the polaron pairs in oligomers.
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Photophysics of graphene quantum dots: Insights from electronic structure calculations
TL;DR: Based on time-dependent density functional theory, the authors elucidate on optical selection rules in isolated graphene quantum dots (QDs) and their relation to the system symmetry and bring the general results into a broader context with other semiconductor QD systems.