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Klaus Kern

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Publications associées (299)

Tracking Temperature-Dependent Relaxation Times of Ferritin Nanomagnets with a Wideband Quantum Spectrometer

Klaus Kern, Markus Ternes

We demonstrate the tracking of the spin dynamics of ensemble and individual magnetic ferritin proteins from cryogenic up to room temperature using the nitrogen-vacancy color center in diamond as a magnetic sensor. We employ different detection protocols to ...

Amer Physical Soc2014

High-Performance ZnO Nanowire Transistors with Aluminum Top-Gate Electrodes and Naturally Formed Hybrid Self-Assembled Monolayer/AlOx Gate Dielectric

Klaus Kern, Frederik Sebastian Ante, Hagen Klauk

A method for the formation of a low-temperature hybrid gate dielectric for high-performance, top-gate ZnO nanowire transistors is reported. The hybrid gate dielectric consists of a self-assembled monolayer (SAM) and an aluminum oxide layer. The thin alumin ...

Amer Chemical Soc2014

Evaluation of the toxicity of graphene derivatives on cells of the lung luminal surface

László Forró, Klaus Kern, Arnaud Magrez, Marko Burghard, Lenke Horváth, Beat Schwaller

Graphene-based nanomaterials are expected to have a profound impact on a broad range of applications. However, studies devoted to investigating the putative adverse health effects of these nanomaterials are hugely underrepresented in the current scientific ...

Pergamon-Elsevier Science Ltd2013

Field-effect-based chemical sensing using nanowire-nanoparticle hybrids: The ion-sensitive metal-semiconductor field-effect transistor

Klaus Kern, Kannan Balasubramanian, Vivek Pachauri

A new class of nanoscale devices called ion-sensitive metal-semiconductor field-effect transistors (nano-IS-MESFET) for sensing applications is reported. Nanoparticle-nanowire hybrids with active metal-semiconductor regions are operated as ion-sensitive fi ...

Amer Inst Physics2013

Chemically exfoliated large-area two-dimensional flakes of molybdenum disulfide for device applications

Klaus Kern, Kannan Balasubramanian, Vivek Pachauri

A solution-based exfoliation method for obtaining large-area two-dimensional flakes of molybdenum disulfide, followed by the fabrication of electrical devices is presented in this manuscript. The exfoliation method is based on the use of an aprotic solvent ...

Amer Inst Physics2013

Bio-inspired nanocatalysts for the oxygen reduction reaction

Klaus Kern, Sebastian Stepanow, Benjamin Wurster

Electrochemical conversions at fuel cell electrodes are complex processes. In particular, the oxygen reduction reaction has substantial overpotential limiting the electrical power output efficiency. Effective and inexpensive catalytic interfaces are theref ...

Nature Publishing Group2013

Programming Hierarchical Supramolecular Nanostructures by Molecular Design

Klaus Kern, Magalí Alejandra Lingenfelder, Giovanni Costantini

Supramolecular nanostructures with tunable dimensionalities are fabricated by deposition of benzene carboxylic acids on the Cu(110) surface. By tailoring the number and position of the functional moieties, the structure of the final molecular assemblies ca ...

Amer Chemical Soc2013

Surface morphology of MnSi thin films grown on Si(111)

Klaus Kern, Theresa Lutz, Giovanni Costantini

The surface morphology of MnSi thin films grown on Si(111)-7 x 7 substrates was investigated by systematically changing the amount of deposited Mn. A new 3 x 3 surface reconstruction was found at the very initial growth stages, whose atomic configuration w ...

Elsevier Science Bv2013

Combined large spin splitting and one-dimensional confinement in surface alloys

Klaus Kern, Marco Grioni, Alberto Crepaldi

We have found and characterized, by angle-resolved photoelectron spectroscopy (ARPES), quasi-one-dimensional spin-split states in chain-like surface alloys formed by large Z elements (Bi and Pb) at the Cu(110) surface. The ARPES results are supported by fi ...

Iop Publishing Ltd2013

A 10 mK scanning tunneling microscope operating in ultra high vacuum and high magnetic fields

Klaus Kern, Markus Etzkorn, Maximilian Assig

We present design and performance of a scanning tunneling microscope (STM) that operates at temperatures down to 10 mK providing ultimate energy resolution on the atomic scale. The STM is attached to a dilution refrigerator with direct access to an ultra h ...

Amer Inst Physics2013

Superexchange-Mediated Ferromagnetic Coupling in Two-Dimensional Ni-TCNQ Networks on Metal Surfaces

Klaus Kern, Violetta Sessi, Tzu-Chun Tseng, Nasiba Abdurakhmanova, Christopher Seiji Kley

We investigate the magnetic coupling of Ni centers embedded in two-dimensional metal-coordination networks self-assembled from 7,7,8,8-tetracyanoquinodimethane (TCNQ) molecules on Ag(100) and Au (111) surfaces. X-ray magnetic circular dichroism measurement ...

Amer Physical Soc2013

Quantitative mapping of fast voltage pulses in tunnel junctions by plasmonic luminescence

Klaus Kern, Markus Etzkorn, Christoph Grosse

An optical read-out technique is demonstrated that enables mapping the time-dependent electrostatic potential in the tunnel junction of a scanning tunneling microscope with millivolt and nanosecond accuracy. We measure the time-dependent intensity of plasm ...

Amer Inst Physics2013

High-mobility organic thin-film transistors based on a small-molecule semiconductor deposited in vacuum and by solution shearing

Klaus Kern, Hagen Klauk

The small-molecule organic semiconductor 2,9-di-decyl-dinaphtho-[2,3-b: 2',3'-f]-thieno[3,2-b]-thiophene (C-10-DNTT) was used to fabricate bottom-gate, top-contact thin-film transistors (TFTs) in which the semiconductor layer was prepared either by vacuum ...

Elsevier Science Bv2013

Experimental visualization of scattering at defects in electronic transport through a single atomic junction

Klaus Kern, Peter Wahl

For electronic transport at the nanoscale, coherent scattering at defects plays an important role. Therefore, the capability of visualizing the influence of defects on the conductivity of single atomic junctions may benefit the development of future nano-e ...

Amer Physical Soc2013

Quantum transport through single atoms and molecules

Klaus Kern, Peter Wahl, Yi Zhang

Experiments on quantum transport in a low temperature scanning tunneling microscope provide the possibility to study atomic and molecular contacts with well-defined electrode-geometry at least for one of the contacts, the surface. Here, we show for a numbe ...

Wiley-V C H Verlag Gmbh2013

Origin of Rashba splitting in the quantized subbands at the Bi2Se3 surface

Klaus Kern, Christian Reinhard Ast

We study the band structure of the Bi2Se3 topological insulator (1 1 1) surface using angle-resolved photoemission spectroscopy. We examine the situation where two sets of quantized subbands exhibiting different Rashba spin splitting are created via bendin ...

Amer Physical Soc2013

Molecular Orbital Gates for Plasmon Excitation

Klaus Kern, Uta Schlickum, Alexander Kabakchiev, Theresa Lutz, Christian Alexander Stephan Dette, Christoph Grosse

Future combinations of plasmonics with nanometer-size electronic circuits require strategies to control the electrical excitation of plasmons at the length scale of individual molecules. A unique tool to study the electrical plasmon excitation with ultimat ...

Amer Chemical Soc2013

Evidence of reduced surface electron-phonon scattering in the conduction band of Bi2Se3 by nonequilibrium ARPES

Helmuth Berger, Philippe Bugnon, Klaus Kern, Marco Grioni, Alberto Crepaldi, Jens Christian Johannsen

The nature of the Dirac quasiparticles in topological insulators calls for a direct investigation of the electron-phonon scattering at the surface. By comparing time-resolved ARPES measurements of the topological insulator Bi2Se3 with different probing dep ...

Amer Physical Soc2013

Combined ARPES and STM study of Pb/Au(111) Moiré structure: One overlayer, two symmetries

Harald Brune, Klaus Kern, Marco Grioni, Markus Etzkorn, Emmanouil Frantzeskakis, Alberto Crepaldi

The structural and electronic properties of a Pb monolayer (ML) grown on Au(111) are investigated by scanning tunneling microscopy (STM) and angle resolved photoelectron spectroscopy (ARPES). We find an incommensurate Moire structure with an approximate (5 ...

Amer Physical Soc2013

Contact properties of high-mobility, air-stable, low-voltage organic n-channel thin-film transistors based on a naphthalene tetracarboxylic diimide

Klaus Kern, Hagen Klauk

Air-stable bottom-gate, top-contact n-channel organic transistors based on a naphthalene diimide exhibiting electron mobilities up to 0.8 cm(2)/Vs at low voltages were fabricated. Transistors with channel lengths of 1 mu m show a transconductance of 60 mS/ ...

Amer Inst Physics2013

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