68 citations · 310 across the 22 of their papers we have counts for
22 papers
Modified Low-Temperature Scanning Tunneling Microscope for Ultrafast Pump-Probe Spectroscopy
Vibhuti N. Rai, Junyoung Sim, Nils Bogdanoff +7
Combining scanning tunneling microscopy (STM) with terahertz pulses (THz-STM) enables ultrafast dynamics of phonons, spins, and charge carriers to be probed with atomic-scale spati…
Influence of atomic-scale defects on coherent phonon excitations by THz near fields in an STM
Vibhuti N. Rai, Junyoung Sim, Florian Faaber +7
Coherent phonons describe the collective, ultrafast motion of atoms and play a central role in light-induced structural dynamics. Here, we employ terahertz scanning tunneling micro…
An atomic-scale perspective on individual thiol-terminated molecules anchored to single S vacancies in MoS
J. Rika Simon, Dmitrii Maksimov, Christian Lotze +7
Sulphur vacancies in MoS on Au(111) have been shown to be negatively charged as reflected by a Kondo resonance. Here, we use scanning tunneling microscopy to show that these va…
Electronic and magnetic properties of single chalcogen vacancies in MoS/Au(111)
Sergey Trishin, Christian Lotze, Nils Krane +1
Two-dimensional (2D) transition-metal dichalcogenides (TMDC) are considered highly promising platforms for next-generation optoelectronic devices. Owing to its atomically thin stru…
Variations of vibronic states in densely-packed structures of molecules with intramolecular dipoles
Sergey Trishin, Christian Lotze, Johanna Richter +5
Electrostatic potentials strongly affect molecular energy levels and charge states, providing the fascinating opportunity of molecular gating. Their influence on molecular vibratio…
Tuning a two-impurity Kondo system by a moiré superstructure
Sergey Trishin, Christian Lotze, Friedemann Lohss +4
Two-impurity Kondo models are paradigmatic for correlated spin-fermion systems. Working with Mn atoms on Au(111) covered by a monolayer of MoS, we tune the inter-adatom exchang…
Resolution of intramolecular dipoles and push-back effect of individual molecules on a metal surface
Sergey Trishin, Tobias Müller, Daniela Rolf +5
Molecules consisting of a donor and an acceptor moiety can exhibit large intrinsic dipole moments. Upon deposition on a metal surface, the dipole may be effectively screened and th…
Shot-noise measurements of single-atom junctions
Idan Tamir, Verena Caspari, Daniela Rolf +2
Current fluctuations related to the discreteness of charge passing through small constrictions are termed shot noise. This unavoidable noise provides both advantages - being a dire…
Electronic Properties of Tetraazaperopyrene Derivatives on Au(111): Energy Level Alignment and Interfacial Band Formation
Arnulf Stein, Daniela Rolf, Christian Lotze +9
N-Heteropolycyclic aromatic compounds are promising organic electron-transporting semiconductors for applications in field effect transistors. Here, we investigated the electronic…
Metal-Organic Superlattices Induced by Long-Range Repulsive Interactions on a Metal Surface
Zechao Yang, Christian Lotze, Katharina J. Franke +1
Chains of Na atoms and dicyanovinyl-quinquethiophene (DCV5T-Me2) molecules with ionic bonds form a superlattice on Au(111). Through a detailed analysis of the interchain distances…
Moiré tuning of spin excitations: Individual Fe atoms on MoS/Au(111)
Sergey Trishin, Christian Lotze, Nils Bogdanoff +2
Magnetic adatoms on surfaces are exchange coupled to their environment, inducing fast relaxation of excited spin states and decoherence. These interactions can be suppressed by ins…
Monolayers of MoS on Ag(111) as decoupling layers for organic molecules: resolution of electronic and vibronic states of TCNQ
Asieh Yousofnejad, Gaël Reecht, Nils Krane +2
The electronic structure of molecules on metal surfaces is largely determined by hybridization and screening by the substrate electrons. As a result, the energy levels are signific…
Vibrational excitation mechanism in tunneling spectroscopy beyond the Franck-Condon model
Gaël Reecht, Nils Krane, Christian Lotze +3
Vibronic spectra of molecules are typically described within the Franck-Condon model. Here, we show that highly resolved vibronic spectra of large organic molecules on a single lay…
Mapping the perturbation potential of metallic and dipolar tips in tunneling spectroscopy on MoS
Nils Krane, Christian Lotze, Nils Bogdanoff +4
Scanning tunneling spectroscopy requires the application of a potential difference between the sample and a tip. In metal-vacuum-metal junctions, one can safely assume that the pot…
-Radical Formation by Pyrrolic H Abstraction of Phthalocyanine Molecules on Molybdenum Disulfide
Gael Reecht, Nils Krane, Christian Lotze +1
For a molecular radical to be stable, the environment needs to be inert. Furthermore, an unpaired electron is less likely to react chemically, when it is placed in an extended orbi…
Correlation of Vibrational Excitations and Electronic Structure\\ with Submolecular Resolution
Daniela Rolf, Friedrich Maass, Christian Lotze +4
The detection of vibrational excitations of individual molecules on surfaces by scanning tunneling spectroscopy does not obey strict selection rules but rather propensity rules. Th…
Electronic Structure of an Iron-Porphyrin Derivative on Au(111)
Arnulf Stein, Daniela Rolf, Christian Lotze +3
Surface-bound porphyrins are promising candidates for molecular switches, electronics and spintronics. Here, we studied the structural and the electronic properties of Fe-tetra-pyr…
Visualizing Intramolecular Distortions as the Origin of Transverse Magnetic Anisotropy
Daniela Rolf, Christian Lotze, Constantin Czekelius +2
The magnetic properties of metal-organic complexes are strongly influenced by conformational changes in the ligand. The flexibility of Fe-tetra-pyridyl-porphyrin molecules leads to…
Correlation of Kondo effect and molecular conformation of the acceptor molecule in the TTF-TCNE charge transfer complex
Paul Stoll, Christian Lotze, Janina N. Ladenthin +3
A Kondo resonance has been observed on purely organic molecules in several combinations of charge transfer complexes on a metal surface. It has been regarded as a fingerprint of th…
Moiré structure of MoS on Au(111): Local structural and electronic properties
Nils Krane, Christian Lotze, Katharina J. Franke
Monolayer islands of molybdenum disulfide (MoS) on Au(111) form a characteristic moiré structure, leading to locally different stacking sequences at the S-Mo-S-Au interface. Us…
Control of oxidation and spin state in a single-molecule junction
Benjamin W. Heinrich, Christopher Ehlert, Nino Hatter +4
The oxidation and spin state of a metal-organic molecule determine its chemical reactivity and magnetic properties. Here, we demonstrate the reversible control of the oxidation and…
Disentangling electron- and electric field-induced ring-closing reactions in a diarylethene derivative on Ag(111)
Gaël Reecht, Christian Lotze, Dmytro Sysoiev +2
Using scanning tunneling microscopy and spectroscopy we investigate the adsorption properties and ring-closing reaction of a diarylethene derivative (C5F-4Py) on a Ag(111) surface.…