598 citations · 5.4k across the 100 of their papers we have counts for
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Temperature dependent temporal coherence of metallic-nanoparticle-induced single-photon emitters in a WSe monolayer
Martin von Helversen, Lara Greten, Imad Limame +7
In recent years, much research has been undertaken to investigate the suitability of two-dimensional materials to act as single-photon sources with high optical and quantum optical…
Spatial Exciton Localization at Interfaces of Metal Nanoparticles and Atomically Thin Semiconductors
Robert Salzwedel, Lara Greten, Stefan Schmidt +3
We present a self-consistent Maxwell-Bloch theory to analytically study the interaction between a nanostructure consisting of a metal nanoparticle and a monolayer of transition met…
Theory of radial oscillations in metal nanoparticles driven by optically induced electron density gradients
Robert Salzwedel, Andreas Knorr, Dominik Hoeing +2
We provide a microscopic approach to describe the onset of radial oscillation of a silver nanoparticle. Using the Heisenberg equation of motion framework, we find that the coupled…
Exciton-phonon-scattering: A competition between bosonic and fermionic nature of bound electron-hole pairs
Manuel Katzer, Malte Selig, Lukas Sigl +7
The question of macroscopic occupation and spontaneous emergence of coherence for exciton ensembles has gained renewed attention due to the rise of van der Waals heterostructures m…
Time-resolved single-particle x-ray scattering reveals electron-density as coherent plasmonic-nanoparticle-oscillation source
D. Hoeing, R. Salzwedel, L. Worbs +18
Dynamics of optically-excited plasmonic nanoparticles are presently understood as a series of sequential scattering events, involving thermalization processes after pulsed optical…
Extended spatial coherence of interlayer excitons in MoSe/WSe heterobilayers
Mirco Troue, Johannes Figueiredo, Lukas Sigl +8
We report on the spatial coherence of interlayer exciton ensembles as formed in MoSe/WSe heterostructures and characterized by point-inversion Michelson-Morley interferomet…
Theory of X-ray absorption spectroscopy: a microscopic Bloch equation approach for two-dimensional solid states
Dominik Christiansen, Malte Selig, Jens Biegert +1
We develop a self-consistent Maxwell-Bloch formalism for the interaction of X-rays with two-dimensional crystalline materials by incorporating the Bloch theorem and Coulomb many-bo…
Phonon-assisted inter-valley scattering determines ultrafast exciton dynamics in MoSe bilayers
Sophia Helmrich, Kevin Sampson, Di Huang +10
While valleys (energy extrema) are present in all band structures of solids, their preeminent role in determining exciton resonances and dynamics in atomically thin transition meta…
Bichromatic four-wave mixing and quadrature-squeezing from biexcitons in atomically thin semiconductor microcavities
Emil V. Denning, Andreas Knorr, Florian Katsch +1
Nonlinear optical effects such as four-wave mixing and generation of squeezed light are ubiquitous in optical devices and light sources. For new devices operating at low optical po…
Impact of optically pumped non-equilibrium steady states on luminescence emission of atomically-thin semiconductor excitons
Malte Selig, Dominik Christiansen, Manuel Katzer +3
The interplay of the non-equivalent corners in the Brillouin zone of transition metal dichalcogenides have been investigated extensively. While experimental and theoretical works c…
Excitonic theory of doping-dependent optical response in atomically thin semiconductors
Florian Katsch, Andreas Knorr
The interaction of optically excited excitons in atomically thin semiconductors with residual doping densities leads to many-body effects which are continuously tunable by external…
Doping-induced non-Markovian interference causes excitonic linewidth broadening in monolayer WSe
Florian Katsch, Andreas Knorr
Strong Coulomb interactions in atomically thin semiconductors like monolayer WSe induce not only tightly bound excitons, but also make their optical properties very sensible to…
Efficient high-harmonic generation in graphene with two-color laser field at orthogonal polarization
Hamlet K. Avetissian, Garnik F. Mkrtchian, Andreas Knorr
High-order frequency mixing in graphene using a two-color radiation field consisting of the fundamental and the second harmonic fields of an ultrashort linearly polarized laser pul…
Interlayer exciton valley polarization dynamics in large magnetic fields
Johannes Holler, Malte Selig, Michael Kempf +11
In van der Waals heterostructures (HS) consisting of stacked MoSe and WSe monolayers, optically bright interlayer excitons (ILE) can be observed when the constituent layers…
Optical dipole orientation of interlayer excitons in MoSe-WSe heterostacks
Lukas Sigl, Mirco Troue, Manuel Katzer +10
We report on the far-field photoluminescence intensity distribution of interlayer excitons in MoSe-WSe heterostacks as measured by back focal plane imaging in the tempe…
Theory of the Coherent Response of Magneto-Excitons and Magneto-Biexcitons in Monolayer Transition Metal Dichalcogenides
Florian Katsch, Dominik Christiansen, Robert Schmidt +4
The recent accessibility of high quality, charge neutral monolayer transition metal dichalcogenides with narrow exciton linewidths at the homogeneous limit provides an ideal platfo…
Exciton-Scattering-Induced Dephasing in Two-Dimensional Semiconductors
Florian Katsch, Malte Selig, Andreas Knorr
Enhanced Coulomb interactions in monolayer transition metal dichalcogenides cause tightly bound electron-hole pairs (excitons) which dominate their linear and nonlinear optical res…
Temporal evolution of low-temperature phonon sidebands in WSe monolayers
Roberto Rosati, Samuel Brem, Raül Perea-Causín +9
Low-temperature photoluminescence (PL) of hBN-encapsulated monolayer tungsten diselenide (WSe) shows a multitude of sharp emission peaks below the bright exciton. Some of them…
Quantized quasinormal mode description of non-linear cavity QED effects from coupled resonators with a Fano-like resonance
Sebastian Franke, Marten Richter, Juanjuan Ren +2
We employ a recently developed quantization scheme for quasinormal modes (QNMs) to study a nonperturbative open cavity-QED system consisting of a hybrid metal-dielectric resonator…
Dipolar and magnetic properties of strongly absorbing hybrid interlayer excitons in pristine bilayer MoS
Etienne Lorchat, Malte Selig, Florian Katsch +5
Van der Waals heterostructures composed of transition metal dichalcogenide monolayers (TMDs) are characterized by their truly rich excitonic properties which are determined by thei…
Entanglement robustness to excitonic spin precession in a quantum dot
Samir Bounouar, Gabriel Rein, Kisa Barkemeyer +9
A semiconductor quantum dot (QD) is an attractive resource to generate polarization-entangled photon pairs. We study the excitonic spin precession (flip-flop) in a family of QDs wi…
Quenching of Intervalley Exchange Coupling in the Presence of Momentum-Dark States in TMDCs
Malte Selig, Florian Katsch, Samuel Brem +3
Monolayers of transition metal dichalcogenides are promising materials for valleytronic applications, since they possess two individually addressable excitonic transitions at the n…
Ultrafast dynamics in monolayer TMDCs: the interplay of dark excitons, phonons and intervalley Coulomb exchange
Malte Selig, Florian Katsch, Robert Schmidt +4
Understanding the ultrafast coupling and relaxation mechanisms between valleys in transition metal dichalcogenide semiconductors is of crucial interest for future valleytronic devi…
Theory of exciton dynamics in time-resolved ARPES: intra- and intervalley scattering in two-dimensional semiconductors
Dominik Christiansen, Malte Selig, Ermin Malic +2
Time- and angle-resolved photoemission spectroscopy (trARPES) is a powerful spectroscopic method to measure the ultrafast electron dynamics directly in momentum-space. However, ban…