128 citations · 575 across the 16 of their papers we have counts for
16 papers
Robust coherent phonon mode at GaP/Si(001) heterointerface
Kunie Ishioka, Gerson Mette, Steven Youngkin +5
Lattice-matched GaP layers without extended defects can be grown on Si(001) substrate via a two-step growth procedure, consisting of low-temperature nucleation followed by high-tem…
Buildup and dephasing of Floquet-Bloch bands on subcycle time scales
S. Ito, M. Schüler, M. Meierhofer +10
Strong light fields have created spectacular opportunities to tailor novel functionalities of solids. Floquet-Bloch states can form under periodic driving of electrons and enable e…
Strongly coupled interface electronic states and interface phonon mode at GaP/Si(001)
Gerson Mette, Kunie Ishioka, Steven Youngkin +3
Ultrafast carrier and phonon dynamics at the buried heterointerface of GaP/Si(001) are investigated by means of two-color pump-probe reflectivity measurements. The carrier-induced…
Ultrafast electron dynamics in a topological surface state observed in two-dimensional momentum space
J. Reimann, K. Sumida, M. Kakoki +5
We study ultrafast population dynamics in the topological surface state of SbTe in two-dimensional momentum space with time- and angle-resolved two-photon photoemission. Li…
Ultrafast charge-transfer dynamics in twisted MoS/WSe heterostructures
J. E. Zimmermann, M. Axt, F. Mooshammer +5
Two-dimensional transition metal dichalcogenides (TMD) offer a unique platform for creating van-der-Waals heterojunctions with fascinating physical properties and promising applica…
Tip-Induced -Hydrogen Dissociation in an Alkyl Group Bound on Si(001)
A. Adamkiewicz, T. Bohamud, M. Reutzel +2
Atomic-scale chemical modification of surface-adsorbed ethyl groups on Si(001) was induced and studied by means of scanning tunneling microscopy. Tunneling at sample bias > +1.5V l…
Momentum-resolved observation of exciton formation dynamics in monolayer WS
Robert Wallauer, Raul Perea-Causin, Lasse Münster +8
The dynamics of exciton formation in transition metal dichalcogenides is difficult to measure experimentally, since many momentum-indirect exciton states are not accessible to opti…
Direct Characterization of Band Bending in GaP/Si(001) Heterostructures with Hard X-ray Photoelectron Spectroscopy
Martin Schmid, Kunie Ishioka, Andreas Beyer +9
We apply hard X-ray photoelectron spectroscopy (HAXPES) to investigate the electronic structures in ~50-nm thick epitaxial GaP layers grown on Si(001) under different conditions. D…
Second-harmonic generation as probe for structural and electronic properties of buried GaP/Si(001) interfaces
K. Brixius, A. Beyer, J. Güdde +4
Optical second-harmonic generation is demonstrated to be a sensitive probe of the buried interface between the lattice matched semiconductors gallium phosphide and silicon with (00…
Model potential for the description of metal/organic interface states
N. Armbrust, F. Schiller, J. Güdde +1
We present an analytical one-dimensional model potential for the description of electronic interface states that form at the interface between a metal surface and flat-lying adlaye…
Chemoselective Reactivity of Bifunctional Cyclooctynes on Si(001)
Marcel Reutzel, Niels Münster, Marcus A. Lipponer +4
Controlled organic functionalization of silicon surfaces as integral part of semiconductor technology offers new perspectives for a wide range of applications. The high reactivity…
Second-harmonic imaging microscopy for time-resolved investigations of transition metal dichalcogenides
J. E. Zimmermann, B. Li, J. Hone +2
Two-dimensional transition metal dichalcogenides (TMDC) have shown promise for various applications in optoelectronics and so-called valleytronics. Their operation and performance…
Intrinsic coherent acoustic phonons in indirect band gap semiconductors Si and GaP
Kunie Ishioka, Avinash Rustagi, Ulrich Hoefer +2
We report on the intrinsic optical generation and detection of coherent acoustic phonons at (001)-oriented bulk Si and GaP without metallic phonon transducer structures. Photoexcit…
Generation of Transient Photocurrents in the Topological Surface State of SbTe by Direct Optical Excitation with Mid-Infrared Pulses
K. Kuroda, J. Reimann, J. Güdde +1
We combine tunable mid-infrared (MIR) pump pulses with time- and angle-resolved two-photon photoemission to study ultrafast photoexcitation of the topological surface state (TSS) o…
Inelastic Decay of Electrons in the Shockley-type Metal-Organic Interface States
S. S. Tsirkin, N. L. Zaitsev, I. A. Nechaev +3
We present a theoretical study of lifetimes of interface states (IS) on metal-organic interfaces PTCDA/Ag(111), NTCDA/Ag(111), PFP/Ag(111), and PTCDA/Ag(100), describing and explai…
Formation of image-potential states at the graphene/metal interface
N. Armbrust, J. Güdde, U. Höfer
The formation of image-potential states at the interface between a graphene layer and a metal surface is studied by means of model calculations. An analytical one-dimensional model…