161 citations · 650 across the 24 of their papers we have counts for
24 papers
A comparative study of perturbative and nonequilibrium Green's function approaches for Floquet sidebands in periodically driven quantum systems
Karun Gadge, Marco Merboldt, Michael Schüler +6
We compare two complementary theoretical approaches to compute and interpret Floquet sidebands in periodically driven quantum materials: a first-order perturbative approach (first-…
ARPES signatures of trions in van der Waals materials
Giuseppe Meneghini, Maja Löwe, Raul Perea-Causin +5
Angle-resolved photoemission spectroscopy (ARPES) has recently emerged as a direct probe of excitonic correlations in two-dimensional semiconductors, resolving their dispersion and…
The role of non-equilibrium populations in dark exciton formation
Paul Werner, Wiebke Bennecke, Jan Philipp Bange +15
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…
Observation of non-adiabatic Landau-Zener tunneling among Floquet states
Yun Yen, Marcel Reutzel, Andi Li +3
Electromagnetic fields not only induce electronic transitions but also fundamentally modify the quantum states of matter through strong light-matter interactions. As one establishe…
Table-top three-dimensional photoemission orbital tomography with a femtosecond extreme ultraviolet light source
Wiebke Bennecke, Thi Lan Dinh, Jan Philipp Bange +11
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 t…
Hybrid Frenkel-Wannier excitons facilitate ultrafast energy transfer at a 2D-organic interface
Wiebke Bennecke, Ignacio Gonzalez Oliva, Jan Philipp Bange +13
Two-dimensional transition metal dichalcogenides (TMDs) and organic semiconductors (OSCs) have emerged as promising material platforms for next-generation optoelectronic devices. T…
Interlayer charge transfer in graphene 2D polyimide heterostructures
Francesca Falorsi, Shuangjie Zhao, Kejun Liu +12
The vertical integration of multiple two-dimensional (2D) materials in heterostructures, held together by van der Waals forces, has opened unprecedented possibilities for modifying…
Observation of Floquet states in graphene
Marco Merboldt, Michael Schüler, David Schmitt +11
Recent advances in the field of condensed-matter physics have unlocked the potential to realize and control emergent material phases that do not exist in thermal equilibrium. One o…
Probing excitons with time-resolved momentum microscopy
Marcel Reutzel, G. S. Matthijs Jansen, Stefan Mathias
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…
Verification of ultrafast spin transfer effects in FeNi alloys
Christina Möller, Henrike Probst, G. S. Matthijs Jansen +7
The optical intersite spin transfer (OISTR) effect was recently verified in FeNi using magneto-optical Kerr measurements in the extreme ultraviolet range. However, on…
Unraveling Femtosecond Spin and Charge Dynamics with EUV T-MOKE Spectroscopy
Henrike Probst, Christina Möller, Maren Schumacher +7
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 ultra…
Ultrafast nano-imaging of dark excitons
David Schmitt, Jan Philipp Bange, Wiebke Bennecke +15
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…
Direct visualization of hybrid excitons in van der Waals heterostructures
Giuseppe Meneghini, Marcel Reutzel, Stefan Mathias +2
Van der Waals heterostructures show fascinating physics including trapped moire exciton states, anomalous moire exciton transport, generalized Wigner crystals, etc. Bilayers of tra…
Ultrafast dynamics of bright and dark excitons in monolayer WSe and heterobilayer WSe/MoS
Jan Philipp Bange, Paul Werner, David Schmitt +15
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…
Probing correlations in the exciton landscape of a moiré heterostructure
Jan Philipp Bange, David Schmitt, Wiebke Bennecke +13
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 interactio…
Multiorbital exciton formation in an organic semiconductor
Wiebke Bennecke, Andreas Windischbacher, David Schmitt +13
Harnessing the optoelectronic response of organic semiconductors requires a thorough understanding of the fundamental light-matter interaction that is dominated by the excitation o…
Formation of moiré interlayer excitons in space and time
David Schmitt, Jan Philipp Bange, Wiebke Bennecke +11
Moiré superlattices in atomically thin van-der-Waals heterostructures hold great promise for an extended control of electronic and valleytronic lifetimes, the confinement of excito…
Plasmonically assisted channels of photoemission from metals
Dino Novko, Vito Despoja, Marcel Reutzel +3
We analyse recently measured nonlinear photoemission spectra from Ag surfaces that reveal resonances whose energies do not scale with the applied photon energy but stay pinned to m…
Direct Access to Auger recombination in Graphene
Marius Keunecke, David Schmitt, Marcel Reutzel +15
Auger scattering channels are of fundamental importance to describe and understand the non-equilibrium charge carrier dynamics in graphene. While impact excitation increases the nu…
Electromagnetic dressing of the electron energy spectrum of Au(111) at high momenta
Marius Keunecke, Marcel Reutzel, David Schmitt +10
Light-engineering of quantum materials via electromagnetic dressing is considered an on-demand approach for tailoring electronic band dispersions and even inducing topological phas…
Towards full surface Brillouin zone mapping by coherent multi-photon photoemission
Andi Li, Namitha Ann James, Tianyi Wang +3
We report a novel approach for coherent multi-photon photoemission band mapping of the entire Brillouin zone with infrared light that is readily implemented in a laboratory setting…
Time-Resolved Momentum Microscopy with a 1 MHz High-Harmonic Extreme Ultraviolet Beamline
M. Keunecke, C. Möller, D. Schmitt +8
Recent progress in laser-based high-repetition rate extreme ultraviolet (EUV) lightsources and multidimensional photoelectron spectroscopy enable the build-up of a new generation o…
Excitation of two-photon photoemission where epsilon is near zero on Ag(111)
Marcel Reutzel, Andi Li, Branko Gumhalter +1
Because silver has epsilon-near-zero (ENZ) in the near-UV spectral region, its optical response is expected to be dominantly plasmonic and nonperturbatively nonlinear. The ENZ prop…
Coherent two-dimensional multiphoton photoelectron spectroscopy of metal surfaces
Marcel Reutzel, Andi Li, Hrvoje Petek
Light interacting with metals elicits an ultrafast coherent many-body screening response on sub- to few-femtosecond time-scales, which makes its experimental observation challengin…