G. S. Matthijs Jansen
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View article: Hybrid Frenkel–Wannier excitons facilitate ultrafast energy transfer at a 2D–organic interface
Hybrid Frenkel–Wannier excitons facilitate ultrafast energy transfer at a 2D–organic interface Open
Two-dimensional transition metal dichalcogenides and organic semiconductors have emerged as promising material platforms for optoelectronic devices. Combining the two is predicted to yield emergent properties while retaining the advantages…
View article: The role of non-equilibrium populations in dark exciton formation
The role of non-equilibrium populations in dark exciton formation Open
In two-dimensional transition metal dichalcogenide structures, the optical excitation of a bright exciton may be followed by the formation of a plethora of lower energy dark states. In these formation and relaxation processes between diffe…
View article: Algorithmic approaches to avoiding bad local minima in nonconvex inconsistent feasibility
Algorithmic approaches to avoiding bad local minima in nonconvex inconsistent feasibility Open
The main challenge of nonconvex optimization is to find a global optimum, or at least to avoid ``bad'' local minima and meaningless stationary points. We study here the extent to which algorithms, as opposed to optimization models and regu…
View article: Table-top three-dimensional photoemission orbital tomography with a femtosecond extreme ultraviolet light source
Table-top three-dimensional photoemission orbital tomography with a femtosecond extreme ultraviolet light source Open
Following electronic processes in molecules and materials at the level of the quantum mechanical electron wavefunction with angstrom-level spatial resolution and with full access to its femtosecond temporal dynamics is at the heart of ultr…
View article: Cyclic Relaxed Douglas-Rachford Splitting for Inconsistent Nonconvex Feasibility
Cyclic Relaxed Douglas-Rachford Splitting for Inconsistent Nonconvex Feasibility Open
We study the cyclic relaxed Douglas-Rachford algorithm for possibly nonconvex, and inconsistent feasibility problems. This algorithm can be viewed as a convex relaxation between the cyclic Douglas-Rachford algorithm first introduced by Bor…
View article: Ultrafast nano-imaging of dark excitons
Ultrafast nano-imaging of dark excitons Open
Saudi Arabian Ministry of Higher Education
View article: Colonizing Futures: The Interplay between Responsibilities and Anticipation in Energy Policy Making Processes
Colonizing Futures: The Interplay between Responsibilities and Anticipation in Energy Policy Making Processes Open
View article: Hybrid Frenkel-Wannier excitons facilitate ultrafast energy transfer at a 2D-organic interface
Hybrid Frenkel-Wannier excitons facilitate ultrafast energy transfer at a 2D-organic interface Open
Two-dimensional transition metal dichalcogenides (TMDs) and organic semiconductors (OSCs) have emerged as promising material platforms for next-generation optoelectronic devices. The combination of both is predicted to yield emergent prope…
View article: Probing excitons with time-resolved momentum microscopy
Probing excitons with time-resolved momentum microscopy Open
Excitons – two-particle correlated electron-hole pairs – are the dominant low-energy optical excitation in the broad class of semiconductor materials, which range from classical silicon to perovskites, and from two-dimensional to organic m…
View article: Fast spectroscopic imaging using extreme ultraviolet interferometry
Fast spectroscopic imaging using extreme ultraviolet interferometry Open
Extreme ultraviolet pulses as generated by high harmonic generation (HHG) are a powerful tool for both time-resolved spectroscopy and coherent diffractive imaging. However, the integration of spectroscopy and microscopy to harness the uniq…
View article: Author Correction: Disentangling the multiorbital contributions of excitons by photoemission exciton tomography
Author Correction: Disentangling the multiorbital contributions of excitons by photoemission exciton tomography Open
View article: A minimalist approach to 3D photoemission orbital tomography: algorithms and data requirements
A minimalist approach to 3D photoemission orbital tomography: algorithms and data requirements Open
Photoemission orbital tomography provides direct access from laboratory measurements to the real-space molecular orbitals of well-ordered organic semiconductor layers. Specifically, the application of phase retrieval algorithms to photon-e…
View article: Fast spectroscopic imaging using extreme ultraviolet interferometry
Fast spectroscopic imaging using extreme ultraviolet interferometry Open
Extreme ultraviolet pulses as generated by high harmonic generation (HHG) are a powerful tool for both time-resolved spectroscopy and coherent diffractive imaging. However, the integration of spectroscopy and microscopy to harness the uniq…
View article: Verification of ultrafast spin transfer effects in iron-nickel alloys
Verification of ultrafast spin transfer effects in iron-nickel alloys Open
The optical intersite spin transfer (OISTR) effect was recently verified in Fe 50 Ni 50 using extreme ultraviolet magneto-optical Kerr measurements. However, one of the main experimental signatures analyzed in this work, namely a magnetic …
View article: Disentangling the multiorbital contributions of excitons by photoemission exciton tomography
Disentangling the multiorbital contributions of excitons by photoemission exciton tomography Open
View article: Probing excitons with time-resolved momentum microscopy
Probing excitons with time-resolved momentum microscopy Open
Excitons -- two-particle correlated electron-hole pairs -- are the dominant low-energy optical excitation in the broad class of semiconductor materials, which range from classical silicon to perovskites, and from two-dimensional to organic…
View article: Probing electron-hole Coulomb correlations in the exciton landscape of a twisted semiconductor heterostructure
Probing electron-hole Coulomb correlations in the exciton landscape of a twisted semiconductor heterostructure Open
In two-dimensional semiconductors, cooperative and correlated interactions determine the material’s excitonic properties and can even lead to the creation of correlated states of matter. Here, we study the fundamental two-particle correlat…
View article: Unraveling femtosecond spin and charge dynamics with extreme ultraviolet transverse MOKE spectroscopy
Unraveling femtosecond spin and charge dynamics with extreme ultraviolet transverse MOKE spectroscopy Open
The magneto-optical Kerr effect (MOKE) in the extreme ultraviolet (EUV) regime has helped to elucidate some of the key processes that lead to the manipulation of magnetism on ultrafast timescales. However, as we show in this paper, the rec…
View article: Ultrafast dynamics of bright and dark excitons in monolayer WSe<sub>2</sub> and heterobilayer WSe<sub>2</sub>/MoS<sub>2</sub>
Ultrafast dynamics of bright and dark excitons in monolayer WSe<sub>2</sub> and heterobilayer WSe<sub>2</sub>/MoS<sub>2</sub> Open
The energy landscape of optical excitations in mono- and few-layer transition metal dichalcogenides (TMDs) is dominated by optically bright and dark excitons. These excitons can be fully localized within a single TMD layer, or the electron…
View article: Verification of ultrafast spin transfer effects in FeNi alloys
Verification of ultrafast spin transfer effects in FeNi alloys Open
The optical intersite spin transfer (OISTR) effect was recently verified in Fe$_{50}$Ni$_{50}$ using magneto-optical Kerr measurements in the extreme ultraviolet range. However, one of the main experimental signatures analyzed in this work…
View article: Unraveling Femtosecond Spin and Charge Dynamics with EUV T-MOKE Spectroscopy
Unraveling Femtosecond Spin and Charge Dynamics with EUV T-MOKE Spectroscopy Open
The magneto-optical Kerr effect (MOKE) in the extreme ultraviolet (EUV) regime has helped to elucidate some of the key processes that lead to the manipulation of magnetism on ultrafast timescales. However, as we show in this paper, the rec…
View article: Ultrafast nano-imaging of dark excitons
Ultrafast nano-imaging of dark excitons Open
The role and impact of spatial heterogeneity in two-dimensional quantum materials represents one of the major research quests regarding the future application of these materials in optoelectronics and quantum information science. In the ca…
View article: Ultrafast dynamics of bright and dark excitons in monolayer WSe$_2$ and heterobilayer WSe$_2$/MoS$_2$
Ultrafast dynamics of bright and dark excitons in monolayer WSe$_2$ and heterobilayer WSe$_2$/MoS$_2$ Open
The energy landscape of optical excitations in mono- and few-layer transition metal dichalcogenides (TMDs) is dominated by optically bright and dark excitons. These excitons can be fully localized within a single TMD layer, or the electron…
View article: Probing correlations in the exciton landscape of a moiré heterostructure
Probing correlations in the exciton landscape of a moiré heterostructure Open
Excitons are two-particle correlated bound states that are formed due to Coulomb interaction between single-particle holes and electrons. In the solid-state, cooperative interactions with surrounding quasiparticles can strongly tailor the …
View article: Multiorbital exciton formation in an organic semiconductor
Multiorbital exciton formation in an organic semiconductor Open
Harnessing the optoelectronic response of organic semiconductors requires a thorough understanding of the fundamental light-matter interaction that is dominated by the excitation of correlated electron-hole pairs, i.e. excitons. The nature…
View article: Formation of moiré interlayer excitons in space and time
Formation of moiré interlayer excitons in space and time Open
Moiré superlattices in atomically thin van-der-Waals heterostructures hold great promise for an extended control of electronic and valleytronic lifetimes, the confinement of excitons in artificial moiré lattices, and the formation of novel…
View article: Far-from-Equilibrium Electron–Phonon Interactions in Optically Excited Graphene
Far-from-Equilibrium Electron–Phonon Interactions in Optically Excited Graphene Open
Comprehending far-from-equilibrium many-body interactions is one of the major goals of current ultrafast condensed matter physics research. Here, a particularly interesting but barely understood situation occurs during a strong optical exc…
View article: Time-resolved Photoelectron Momentum Microscopy using a 1 MHz High-Harmonic Generation Beamline
Time-resolved Photoelectron Momentum Microscopy using a 1 MHz High-Harmonic Generation Beamline Open
In the last decades, high-harmonic generation (HHG) has rapidly developed from an experimental novelty into a workhorse of laboratory-based ultrafast physics research. In the field of photoelectron spectroscopy, extreme ultraviolet light f…
View article: Ultrafast element-resolved magneto-optics using a fiber-laser-driven extreme ultraviolet light source
Ultrafast element-resolved magneto-optics using a fiber-laser-driven extreme ultraviolet light source Open
We present a novel setup to measure the transverse magneto-optical Kerr effect in the extreme ultraviolet spectral range based on a fiber laser amplifier system with a repetition rate between 100 and 300 kHz, which we use to measure elemen…
View article: Ultrafast element-resolved magneto-optics using a fiber-laser-driven\n extreme ultraviolet light source
Ultrafast element-resolved magneto-optics using a fiber-laser-driven\n extreme ultraviolet light source Open
We present a novel setup to measure the transverse magneto-optical Kerr\neffect in the extreme ultraviolet spectral range at exceptionally high\nrepetition rates based on a fiber laser amplifier system. This affords a very\nhigh and stable…