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Klaus Kern

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Related publications (299)

Gate-controlled linear magnetoresistance in thin Bi2Se3 sheets

Klaus Kern, Marko Burghard, Pascal Gehring

We explore the emergence of linear magnetoresistance in thin Bi2Se3 sheets upon tuning the carrier density using a back gate. With increasingly negative gate voltage, a pronounced magnetoresistance of similar to 100% is observed, while the associated B-fie ...

AIP American Institute of Physics2012

The Quantum Magnetism of Individual Manganese-12-Acetate Molecular Magnets Anchored at Surfaces

Klaus Kern, Markus Ternes, Stephan Rauschenbach, Nicha Thontasen, Gordon Rinke

The high intrinsic spin and long spin relaxation time of manganese-12-acetate (Mn-12) makes it an archetypical single molecular magnet. While these characteristics have been measured on bulk samples, questions remain whether the magnetic properties replica ...

American Chemical Society (ACS)2012

Varying molecular interactions by coverage in supramolecular surface chemistry

Klaus Kern, Magalí Alejandra Lingenfelder, Giovanni Costantini

The possibility of modifying the intermolecular interactions of absorbed benzene-carboxylic acids from coordination to hydrogen bonding by changing their surface coverage is demonstrated through a combination of scanning tunnelling microscopy, X-ray photo- ...

Royal Society of Chemistry2012

Ultrafast photodoping and effective Fermi-Dirac distribution of the Dirac particles in Bi2Se3

Helmuth Berger, Philippe Bugnon, Klaus Kern, Marco Grioni, Alberto Crepaldi

We exploit time- and angle-resolved photoemission spectroscopy to determine the evolution of the out-of-equilibrium electronic structure of the topological insulator Bi2Se3. The response of the Fermi-Dirac distribution to ultrashort IR laser pulses has bee ...

Amer Physical Soc2012

Highly Adaptable Two-Dimensional Metal-Organic Coordination Networks on Metal Surfaces

Klaus Kern, Sebastian Stepanow, Christopher Seiji Kley

The formation of extended two-dimensional metal organic coordination networks (2D-MOCNs) showing high adaptability to surface step edges and structural defects is revealed by scanning tunneling microscopy. Rod-like 4,4'-di-(1,4-buta-1,3-diynyl)-benzoic aci ...

2012

Self-Assembled Electrical Biodetector Based on Reduced Graphene Oxide

Klaus Kern, Kannan Balasubramanian, Ravi Shankar Sundaram, Subramanian Sundaram

Large-scale fabrication of graphene-based devices is an aspect of great importance for various applications including chemical and biological sensing. Toward this goal, we present here a novel chemical route for the site-specific realization of devices bas ...

2012

Growth of High-Mobility Bi2Te2Se Nanoplatelets on hBN Sheets by van der Waals Epitaxy

Klaus Kern, Marko Burghard, Pascal Gehring

The electrical detection of the surface states of topological insulators is strongly impeded by the interference of bulk conduction, which commonly arises due to pronounced doping associated with the formation of lattice defects. As exemplified by the topo ...

Amer Chemical Soc2012

Graphene Sublattice Symmetry and Isospin Determined by Circular Dichroism in Angle-Resolved Photoemission Spectroscopy

Klaus Kern, Isabella Gierz

The Dirac-like electronic structure of graphene originates from the equivalence of the two basis atoms in the honeycomb lattice. We show that the characteristic parameters of the initial state wave function (sublattice symmetry and isospin) can be determin ...

Amer Chemical Soc2012

Electroluminescence properties of organic nanostructures studied by scanning tunnelling microscopy

Klaus Kern, Alexander Kabakchiev, Theresa Lutz

The control of light emission on the scale of individual quantum systems, like molecules or quantum dots, is a field of intense current research. One way to induce light emission from these systems is the local charge injection through the tip of a scannin ...

2012

Growth mode and atomic structure of MnSi thin films on Si(111)

Klaus Kern, Theresa Lutz, Giovanni Costantini

Thin films of MnSi(111) in B20 structure formed by reactive epitaxy on Si(111) are studied using scanning tunneling microscopy (STM) and density functional theory calculations. Coexisting root 3 x root 3 structures with high or low corrugation are observed ...

Amer Physical Soc2012

The Graphene-Gold Interface and Its Implications for Nanoelectronics

Klaus Kern, Marko Burghard, Ravi Shankar Sundaram

We combine optical microspectroscopy and electronic measurements to study how gold deposition affects the physical properties of graphene. We find that the electronic structure, the electron-phonon coupling, and the doping level in gold-plated graphene are ...

American Chemical Society (ACS)2011

Apertureless near-field optical microscopy: Differences between heterodyne interferometric and non-interferometric images

Klaus Kern

We analyze simulations of the image generation process in apertureless Scanning Near-Field Optical Microscopy to study the differences between heterodyne interferometric and non-interferometric detection schemes implemented in experiments. Beyond the well- ...

2011

Experimental observation of thermal fluctuations in single superconducting Pb nanoparticles through tunneling measurements

Klaus Kern

An important question in the physics of superconducting nanostructures is the role of thermal fluctuations (TFs) on superconductivity in the zero-dimensional limit. Here, we probe the evolution of superconductivity as a function of temperature and particle ...

2011

Oxygen Dissociation by Concerted Action of Di-Iron Centers in Metal-Organic Coordination Networks at Surfaces: Modeling Non-Heme Iron Enzymes

Klaus Kern, Pietro Gambardella, Alexandre Dmitriev, Sebastian Stepanow

The high chemical reactivity of unsaturated metal sites is a key factor for the development of novel devices with applications in sensor engineering and catalysis. It is also central in the research for sustainable energy concepts, e.g., the efficient prod ...

American Chemical Society (ACS)2011

Near-Field Dynamics of Optical Yagi-Uda Nanoantennas

Klaus Kern, Moritz Esslinger

We present near-field measurements of optical Yagi-Uda nanoantennas that are used in receiving mode. The eigenmode imaging of amplitude and phase by apertureless scanning near-field optical microscopy allows us to investigate the dynamics of the local out- ...

American Chemical Society (ACS)2011

A tunable two-impurity Kondo system in an atomic point contact

Klaus Kern, Peter Wahl

Two magnetic atoms, one attached to the tip of a scanning tunnelling microscope and one adsorbed on a metal surface, each constituting a Kondo system, have been proposed as one of the simplest conceivable systems potentially exhibiting quantum critical beh ...

2011

Quantum Point Contact Microscopy

Klaus Kern, Peter Wahl

We introduce quantum point contact microscopy (QPCM) as a novel method for surface characterization, where the conductance through a quantum point contact formed by a metal atom between the tip of a scanning tunneling microscope and the surface is mapped a ...

American Chemical Society (ACS)2011

Reactive Chemical Doping of the Bi2Se3 Topological Insulator

Klaus Kern

Using angular resolved photoemission spectroscopy we studied the evolution of the surface electronic structure of the topological insulator Bi2Se3 as a function of water vapor exposure. We find that a surface reaction with water induces a band bending, whi ...

2011

Long-Distance Indirect Excitation of Nanoplasmonic Resonances

Klaus Kern, Alexandre Dmitriev, Moritz Esslinger

In nanoscopic systems, size, geometry, and arrangement are the crucial determinants of the light-matter interaction and resulting nanoparticles excitation. At optical frequencies, one of the most prominent examples is the excitation of localized surface pl ...

American Chemical Society (ACS)2011

Label-Free Detection of Few Copies of DNA with Carbon Nanotube Impedance Biosensors

Klaus Kern, Kannan Balasubramanian

Wiley-VCH Verlag GmbH2011

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