Electrical charges can generate photon emission in nanoscale quantum systems by two independent mechanisms. First, radiative recombination of pairs of oppositely charged carriers generates sharp excitonic lines. Second, coupling between currents and collec ...

AMER ASSOC ADVANCEMENT SCIENCE2018

The STM bias voltage-dependent polymorphism of a binary supramolecular network

Klaus Kern, Magalí Alejandra Lingenfelder, Bart Willem Stel, Fernando Pablo Cometto, Kilian Frank

A Scanning Tunneling Microscope (STM) is used to induce a reversible transition between different polymorphs in a binary supramolecular network at the liquid/solid interface. The transition is driven externally by switching the polarity of the sample by po ...

Royal Society of Chemistry2017

Quantitative and Direct Near-Field Analysis of Plasmonic-Induced Transparency and the Observation of a Plasmonic Breathing Mode

Klaus Kern, Moritz Esslinger

We investigated experimentally and numerically in the optical near-field a plasmonic model system similar to a dolmen-type structure for phenomena such as plasmon-induced transparency. Through engineering of coupling strength, structure orientation, and in ...

Amer Chemical Soc2016

Thermodynamics of the Segregation of a Kinetically Trapped Two-Dimensional Amorphous Metal-Organic Network

Klaus Kern, Claudius Morchutt

Surface-confined self-assembled molecular networks are commonly described as crystalline structures with short- and long-range order. Few exceptions to this trend are found in the literature reporting on amorphous and glassy networks and, discussing the or ...

Amer Chemical Soc2016

The classical and quantum dynamics of molecular spins on graphene

Klaus Kern, Stephan Rauschenbach, Marko Burghard

Controlling the dynamics of spins on surfaces is pivotal to the design of spintronic(1) and quantum computing(2) devices. Proposed schemes involve the interaction of spins with graphene to enable surface-state spintronics(3,4) and electrical spin manipulat ...

Nature Publishing Group2016

Remotely Controlled Isomer Selective Molecular Switching

Klaus Kern, Uta Schlickum, Peter Wahl, Hagen Klauk, Ivan Pentegov, Verena Katharina Schendel

Non local addressing-the "remote control"- of molecular switches promises more efficient processing for information technology, where fast speed of switching is essential. The surface state of the (111) facets of noble metals, a confined two-dimensional el ...

Amer Chemical Soc2016

Critical Josephson current in the dynamical Coulomb blockade regime

Klaus Kern, Markus Etzkorn, Maximilian Assig, Matthias Alexander Eltschka

The current-voltage characteristics of a voltage-biased Josephson junction in the low conductance regime of an ultra-low temperature scanning tunneling microscope (STM) is dominated by sequential charge tunneling. Using P(E) theory we show that the Josephs ...

Amer Physical Soc2016

Surface Structure and Chemistry of Alkanethiols on Au(100)-(1 x 1) Substrates

Klaus Kern

The surface structure of self-assembled monolayers of hexanethiolate (HT) on the Au(100)-(1 x 1) surface has been studied by density functional theory (DFT) calculations and their results compared to scanning tunneling microscopy (STM) and X-ray photoelect ...

Amer Chemical Soc2016

Two-dimensional honeycomb network through sequence-controlled self-assembly of oligopeptides

Klaus Kern, Stephan Rauschenbach, Sabine Abb

The sequence of a peptide programs its self-assembly and hence the expression of specific properties through non-covalent interactions. A large variety of peptide nanostructures has been designed employing different aspects of these non-covalent interactio ...

Nature Publishing Group2016

Long- versus Short-Range Scattering in Doped Epitaxial Graphene

Klaus Kern, Christian Reinhard Ast, Carola Strasser

Tuning the electronic properties of graphene by adatom deposition unavoidably introduces disorder into the system, which directly affects the single-particle excitations and electrodynamics. Using angle-resolved photoemission spectroscopy (ARPES) we trace ...

Amer Chemical Soc2015

Local Conformational Switching of Supramolecular Networks at the Solid/Liquid Interface

Klaus Kern, Magalí Alejandra Lingenfelder, Fernando Pablo Cometto

We use the electric field in a scanning tunneling microscope to manipulate the transition between open and close packed 2D supramolecular networks of neutral molecules in nonpolar media. We found that while the magnitude of the applied field is not decisiv ...

Amer Chemical Soc2015

Thin-layer black phosphorus/GaAs heterojunction p-n diodes (vol 106, 233110, 2015)

Klaus Kern, Marko Burghard, Pascal Gehring

Amer Inst Physics2015

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