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Klaus Kern

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Related publications (299)

Spin and Orbital Magnetic Moment Anisotropies of Monodispersed Bis(Phthalocyaninato)Terbium on a Copper Surface

Klaus Kern, Pietro Gambardella, Sebastian Stepanow, Stephan Rauschenbach, Violetta Sessi, Tzu-Chun Tseng, Nasiba Abdurakhmanova

The magnetic properties of isolated TbPc2 molecules supported on a Cu(100) surface are investigated by X-ray magnetic circular dichroism at 8 K in magnetic fields up to 5 T. The crystal field and magnetic properties of single molecules are found to be robu ...

2010

Portrait of the potential barrier at metal-organic nanocontacts

Klaus Kern

Electron transport through metal-molecule contacts greatly affects the operation and performance of electronic devices based on organic semiconductors(1-4) and is at the heart of molecular electronics exploiting single-molecule junctions(5-8). Much of our ...

2010

Surveying Molecular Vibrations during the Formation of Metal-Molecule Nanocontacts

Klaus Kern

Molecular junctions have been characterized to determine the influence of the metal contact formation in the electron transport process through a single molecule. With inelastic electron tunneling spectroscopy and first-principles calculations, the vibrati ...

American Chemical Society (ACS)2010

Probing the electrical properties of highly-doped Al:ZnO nanowire ensembles

Klaus Kern, Hagen Klauk

The analysis of transparent conducting oxide nanostructures suffers from a lack of high throughput yet quantitatively sensitive set of analytical techniques that can properly assess their electrical properties and serve both as characterization and diagnos ...

2010

Rational Design of Two-Dimensional Nanoscale Networks by Electrostatic Interactions at Surfaces

Klaus Kern, Sebastian Stepanow

The self-assembly of aromatic carboxylic acids and cesium adatoms on a Cu(100) surface at room temperature has been investigated by scanning tunneling microscopy and X-ray photoelectron spectroscopy. The highly ordered molecular nanostructures are comprise ...

2010

A Graphene Nanoribbon Memory Cell

Klaus Kern, Marko Burghard, Floriano Traversi

2010

Assessing the atomic contribution to the Rashba spin-orbit splitting in surface alloys: Sb/Ag(111)

Klaus Kern, Marco Grioni, Christian Reinhard Ast, Luca Moreschini

We have studied the electronic structure of the Ag(111)(root 3x root 3)R30 degrees-Sb surface alloy by angle-resolved photoemission. We find two hybrid surface bands, similar to the isostructural Ag(111)-Bi interface. The spin-orbit coupling induced spin s ...

2009

Influence of the substrate on the spin-orbit splitting in surface alloys on (111) noble-metal surfaces

Klaus Kern, Marco Grioni, Christian Reinhard Ast, Luca Moreschini

We have studied by angle-resolved photoelectron spectroscopy the ordered XCu2 surface alloys formed by X=Sb and Bi on a Cu(111) substrate. We found clear analogies with the corresponding XAg2 alloys formed by the same elements on Ag(111). The electronic st ...

2009

Silicon Surface with Giant Spin Splitting

Klaus Kern, Marco Grioni, Christian Reinhard Ast, Emmanouil Frantzeskakis

We demonstrate a giant Rashba-type spin splitting on a semiconducting substrate by means of a Bi-trimer adlayer on a Si(111) wafer. The in-plane inversion symmetry is broken inducing a giant spin splitting with a Rashba energy of about 140 meV, much larger ...

American Physical Society2009

Effect of Stacking Order on the Electric-Field Induced Carrier Modulation in Graphene Bilayers

Klaus Kern, Kannan Balasubramanian, Marko Burghard, Eduardo Jian Hua Lee, Adarsh Singh Sagar

When planar graphene sheets are stacked on top of each other, the electronic structure of the system varies with the position of the subsequent sublattice atoms. Here, we employ scanning photocurrent microscopy to study the disparity in the behavior of cha ...

American Chemical Society (ACS)2009

Chemical Vapor Deposition Repair of Graphene Oxide: A Route to Highly Conductive Graphene Monolayers

Klaus Kern, Marko Burghard, Ravi Shankar Sundaram

Highly conductive chemically derived graphene can be synthesized using an efficient two-step method starting from graphene oxide. The key strategy involves the use of a CVD process to heal defects contained within the monolayers, which imparts a two order ...

Wiley2009

Nanoionics and Nanoelectronics

Klaus Kern, Joachim Maier

Wiley2009

Electrospray Ion Beam Deposition: Soft-Landing and Fragmentation of Functional Molecules at Solid Surfaces

Klaus Kern, Stephan Rauschenbach, Nicha Thontasen, Giovanni Costantini

The ion, beam deposition (IBD) of rhodamine dye molecules on solid surfaces in high vacuum is explored in order to characterize the possibility of fabricating molecular coatings or nanostructures from nonvolatile molecules. Molecular ion beams with a well- ...

2009

Selective Enhancement of Carbon Nanotube Photoluminescence by Resonant Energy Transfer

Klaus Kern, Kannan Balasubramanian

We report on a simple method for enhancing the efficiency of photoluminescence (PL) emission from selected chiral forms of semiconducting single-wall carbon nanotubes (SWCNTs). The method is based on the use of a fluorescent dye (Nile blue A) that shows th ...

2009

Catalytic coating of virus particles with zinc oxide

Klaus Kern, Alexander Bittner, Sinan Balci

We show that the rod-shaped Tobacco mosaic virus (TMV) can be coated with the wide band gap semiconductor zinc oxide by electroless deposition under mild reaction conditions. The process involves pretreatment with aqueous Pd(II), followed by nucleation of ...

2009

Highly Reliable Carbon Nanotube Transistors with Patterned Gates and Molecular Gate Dielectric

Klaus Kern, Marko Burghard, Ralf Thomas Weitz, Hagen Klauk

The prospect of realizing nanoscale transistors using individual semiconducting carbon nanotubes offers enormous potential, both as an alternative to silicon technology beyond conventional scaling limits and as a way to implement high-speed devices and cir ...

American Chemical Society (ACS)2009

Spatially Resolved Potential Distribution in Carbon Nanotube Cross-Junction Devices

Klaus Kern, Kannan Balasubramanian, Marko Burghard, Eduardo Jian Hua Lee

Crossed-nanotube junctions, the basic constituents of carbon nanotube networks, are investigated by scanning photocurrent microscopy. The location of the predominant electrostatic potential drop, at the electrical contacts or at the junction, is found to b ...

Wiley2009

Two- to one-dimensional transition of self-assembled coordination networks at surfaces by organic ligand addition

Klaus Kern, Alexander Langner

Two-dimensional metal-organic coordination networks at a Cu(100) surface are transformed to a new supramolecular structure with one-dimensional coordination character by the addition of a second organic ligand. ...

Royal Society of Chemistry2009

Noninvasive metal contacts in chemically derived graphene devices

Klaus Kern, Marko Burghard, Eduardo Jian Hua Lee, Ravi Shankar Sundaram

We study the properties of gold contacts on chemically derived graphene devices by scanning photocurrent microscopy and gate-dependent electrical transport measurements. In the as-fabricated devices, negligible potential barriers are found at the gold/grap ...

AIP American Institute of Physics2009

Carbon nanotube transistors - chemical functionalisation and device characterisation

Klaus Kern

wiley2009

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