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Klaus Kern

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Related publications (299)

Electronic properties and atomic structure of graphene oxide membranes

Klaus Kern, Daniela Pacilè, Marko Burghard, Ravi Shankar Sundaram

We have performed a near-edge X-ray absorption fine-structure (NEXAFS) and a transmission electron microscopy (TEM) investigation of freely suspended graphene oxide (GO) sheets. We utilized a photoemission electron microscope to identify GO membranes and t ...

2011

3D optical Yagi-Uda nanoantenna array

Klaus Kern

Future photonic circuits with the capability of high-speed data processing at optical frequencies will rely on the implementation of efficient emitters and detectors on the nanoscale. Towards this goal, bridging the size mismatch between optical radiation ...

Nature Research2011

Self-Assembled Nanometer-Scale Magnetic Networks on Surfaces: Fundamental Interactions and Functional Properties

Harald Brune, Klaus Kern, Pietro Gambardella, Stefano Rusponi, Anne Lehnert, Sebastian Stepanow, Sergio Vlaic

Nanomagnets of controlled size, organized into regular patterns open new perspectives in the fields of nanoelectronics, spintronics, and quantum computation. Self-assembling processes on various types of substrates allow designing fine-structured architect ...

Wiley-Blackwell2011

Tuning the spin texture in binary and ternary surface alloys on Ag(111)

Klaus Kern, Isabella Gierz, Jan Hugo Dil

A giant spin splitting has been observed in surface alloys on noble metal (111) surfaces as a result of a strong structural modification at the surface as well as the large atomic spin-orbit interaction (SOI) of the alloy atoms. These surface alloys are an ...

2011

Polymer-electrolyte gated graphene transistors for analog and digital phase detection

Klaus Kern, Kannan Balasubramanian, Marko Burghard, Adarsh Singh Sagar

We present an alternating current (ac) circuit based on a misoriented bilayer graphene device for analog and digital phase detection. We exploit the ambipolar nature of the transfer characteristics of a misoriented bilayer graphene transistor. The transist ...

AIP American Institute of Physics2011

Local spectroscopy of the Kondo lattice YbAl3: Seeing beyond the surface with scanning tunneling microscopy and spectroscopy

Klaus Kern, Peter Wahl

We report on an atomic-scale study of the Kondo lattice compound YbAl3 using scanning tunneling microscopy (STM) and spectroscopy (STS). An analysis of the surface orientation and structure is performed based on STM images containing more than one crystal ...

2011

Influence of Subsurface Layers on the Adsorption of Large Organic Molecules on Close-Packed Metal Surfaces

Klaus Kern

The asymmetric molecule 4-[trans-2-(pyrid-4-yl-vinyl)] benzoic acid (PVBA) adsorbed on Cu(111) is characterized by scanning tunneling microscopy (STM) and density functional theory (DFT) to determine the influence of subsurface atomic layers on the adsorpt ...

2011

Scanning Tunneling Luminescence of Individual CdSe Nanowires

Klaus Kern, Marko Burghard, Alexander Kabakchiev, Theresa Lutz, Thomas Dufaux, Zhe Wang

The local luminescence properties of individual CdSe nanowires composed of segments of zinc blende and wurtzite crystal structures are investigated by low-temperature scanning tunneling luminescence spectroscopy. Light emission from the wires is achieved b ...

2011

Top-Gate ZnO Nanowire Transistors and Integrated Circuits with Ultrathin Self-Assembled Monolayer Gate Dielectric

Klaus Kern, Ralf Thomas Weitz, Frederik Sebastian Ante, Hagen Klauk

A novel approach for the fabrication of transistors and circuits based on individual single-crystalline ZnO nanowires synthesized by a low-temperature hydrothermal method is reported. The gate dielectric of these transistors is a self-assembled monolayer t ...

American Chemical Society (ACS)2011

Hierarchical Assembly and Reticulation of Two-Dimensional Mn- and Ni-TCNQ(x) (x=1, 2,4) Coordination Structures on a Metal Surface

Klaus Kern, Sebastian Stepanow, Tzu-Chun Tseng, Nasiba Abdurakhmanova

We report a scanning tunneling microscopy (STM) investigation of the self-assembly of two-dimensional metal-organic coordination networks comprised of Mn or Ni atoms (M) and 7,7,8,8-tetracyanoquinodimethane (TCNQ) molecules on a Ag(100) surface. The growth ...

2011

Terephthalic acid adsorption on Si(111)-(root 3x root 3)-Bi surfaces: Effect of Bi coverage

Klaus Kern, Theresa Lutz, Giovanni Costantini

The influence of the density of metallic atoms on the formation of supramolecular structures onto Si surface alloys is investigated by scanning tunneling microscopy. Terephthalic acid (TPA) adsorption experiments are performed on the Si(111) alpha- and bet ...

2011

Illuminating the dark corridor in graphene: Polarization dependence of angle-resolved photoemission spectroscopy on graphene

Klaus Kern, Isabella Gierz

We have used s- and p-polarized synchrotron radiation to image the electronic structure of epitaxial graphene near the (K) over bar point by angle-resolved photoemission spectroscopy (ARPES). Part of the experimental Fermi surface is suppressed due to the ...

2011

Image potential states as a quantum probe of graphene interfaces

Klaus Kern

Image potential states (IPSs) are electronic states localized in front of a surface in a potential well, formed by the surface projected bulk band gap on one side and the image potential barrier on the other. In the limit of a two-dimensional solid, a doub ...

2010

Observation of shell effects in superconducting nanoparticles of Sn

Klaus Kern

In a zero-dimensional superconductor, quantum size effects(1,2) (QSE) not only set the limit to superconductivity, but are also at the heart of new phenomena such as shell effects, which have been predicted to result in large enhancements of the supercondu ...

2010

Atomic Structure of Reduced Graphene Oxide

Klaus Kern, Marko Burghard, Ravi Shankar Sundaram

Using high resolution transmission electron microscopy. we identify the specific atomic scale features in chemically derived graphene monolayers that originate from the oxidation-reduction treatment of graphene. The layers are found to comprise defect-free ...

American Chemical Society (ACS)2010

Marker-free on-the-fly fabrication of graphene devices based on fluorescence quenching

Klaus Kern, Kannan Balasubramanian, Adarsh Singh Sagar

Graphene has been dominating the electronic research community recently, with a brisk surge in proposals for its use in novel devices. The aspirations of 2D-carbon-based electronics largely rely on the availability of a mass-production technique to obtain ...

2010

Photocurrent Distribution in Graphene-CdS Nanowire Devices

Klaus Kern, Marko Burghard, Thomas Dufaux

2010

Plasmonic Nanowire Antennas: Experiment, Simulation, and Theory

Klaus Kern

Recent advances in nanolithography have allowed shifting of the resonance frequency of antennas into the optical and visible wavelength range with potential applications, for example, in single molecule spectroscopy by fluorescence and directionality enhan ...

American Chemical Society (ACS)2010

Enzyme-Free Sugar Sensing in Microfluidic Channels with an Affinity-Based Single-Wall Carbon Nanotube Sensor

Klaus Kern, Kannan Balasubramanian

We present a novel nonenzymatic carbon nanotube sensor integrated in a microfluidic channel for the detection of sugars. The sensor is assembled as a liquid-gated field-effect transistor, with the transistor channel composed of 1 to 10 nanotubes, which are ...

2010

Versatile optical access to the tunnel gap in a low-temperature scanning tunneling microscope

Klaus Kern, Alexander Kabakchiev

We developed a setup that provides three independent optical access paths to the tunnel junction of an ultrahigh vacuum low temperature (4.2 K) scanning tunneling microscope (STM). Each path can be individually chosen to couple light in or out, or to image ...

2010

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