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Articles by Ferdinand Evers
Unidirectional rotation in a molecular motor driven by angular-momentum transfer via helical orbitals
Abstract The generation of unidirectional motion has been a long-standing challenge in the engineering of molecular motors and, more generally, machines. A molecular motor is characterized by a set of low-energy states that differ in their configuration, that is, position or rotation. In biology and Feringa-type motors, unidirectional motion is driven by excitation of the molecule into a high-energy transitional state followed by a directional relaxation back to a low-energy state.
Nonlinear circular dichroism reveals the local Berry curvature
Abstract The transfer of angular momentum between light and crystalline solids during nonlinear optical processes is typically interpreted in terms of angular momentum conservation and the rotational symmetry of the crystal lattice. However, these cornerstone principles rely on macroscopic symmetry arguments, providing little insight into the microscopic origin of angular momentum transfer.
Designing effective single-molecule electromagnets with radially π-conjugated carbon structures
Abstract When charge flows through a molecular circuit, it induces a magnetic field that allows the circuit to behave as a nanoscale electromagnet. However, in single-molecule circuits this magnetic field is usually weak. Here we show that radially π-conjugated carbon structures can support amplified circulating currents that generate local magnetic fields.
Giant DC-like residual current generated by subcycle laser pulses
Experimental indications have been reported suggesting that laser pulses shining on materials with relativistic dispersion can produce currents that survive long after the illumination has died out. Such residual currents, i.e., remnant currents, have applications in petahertz logical gates. The remnant currents' strength strongly depends on the pulse shape.
Photooxidation driven formation of Fe-Au linked ferrocene-based single-molecule junctions - Nature Communications
Abstract Metal-metal contacts, though not yet widely realized, may provide exciting opportunities to serve as tunable and functional interfaces in single-molecule devices. One of the simplest components which might facilitate such binding interactions is the ferrocene group. Notably, direct bonds between the ferrocene iron center and metals such as Pd or Co have been demonstrated in molecular complexes comprising coordinating ligands attached to the cyclopentadienyl rings.
Internal clock of many-body delocalization
After a decade of many claims to the opposite, there now is a growing consensus that generic disordered quantum wires, e.g., the XXZ-Heisenberg chain, do not exhibit many-body localization (MBL)—at least not in a strict sense within a reasonable window of disorder values W.
Influence of chirp and carrier-envelope phase on noninteger high-harmonic generation
Abstract High-harmonic generation (HHG) is a versatile technique for probing ultrafast electron dynamics. While HHG is sensitive to the electronic properties of the target, HHG also depends on the waveform of the laser pulse. As is well known, (peak) positions, ω, in the high-harmonic spectrum can shift when the carrier envelope phase (CEP), φ, is varied.
Highly conducting single-molecule topological insulators based on mono- and di-radical cations - Nature Chemistry
Abstract Single-molecule topological insulators are promising candidates as conducting wires over nanometre length scales. A key advantage is their ability to exhibit quasi-metallic transport, in contrast to conjugated molecular wires which typically exhibit a low conductance that decays as the wire length increases. Here, we study a family of oligophenylene-bridged bis(triarylamines) with tunable and stable mono- or di-radicaloid character.
Atomically resolved single-molecule triplet quenching
Report View ORCID ProfileJinbo Peng1,*, View ORCID ProfileSophia Sokolov1, View ORCID ProfileDaniel Hernangómez-Pérez2, Ferdinand Evers3, View ORCID ProfileLeo Gross4, John M. Lupton1, View ORCID ProfileJascha Repp1,* 1Institute for Experimental and Applied Physics and Regensburg Center for Ultrafast Nanoscopy (RUN), University of Regensburg, 93040 Regensburg, Germany. 2Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 7610001, Israel.
Silver Makes Better Electrical Contacts to Thiol-terminated Silanes than Gold
We report that the single molecule junction conductance of thiol-terminated silanes with Ag electrodes are higher than the conductance of those formed with Au electrodes. These results are in contrast to the trends in the metal work function ?(Ag) < ?(Au). As such, one would expect a better alignment of the Au Fermi level to the molecular orbital of silane that mediates charge transport.
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