Atmospheric pressure graphitization of SiC(0001)- A route towards wafer-size graphene layers (2008)
Emtsev, Konstantin V., Bostwick, Aaron, Horn, Karsten, Jobst, Johannes, Kellogg, Gary L., Ley, Lothar, ...
We have investigated epitaxial graphene films grown on SiC(0001) by annealing in an atmosphere of Ar instead of vacuum. Using AFM and LEEM we observe a significantly improved surface morphology and...
Interlayer Interaction and Electronic Screening in Multilayer Graphene (2008)
Ohta, Taisuke, Bostwick, Aaron, McChesney, J.L., Seyller, Thomas, Horn, Karsten, Rotenberg, Eli
Photoemission studies of graphene on SiC: growth, interface, and electronic structure (2008)
Bostwick, Aaron, Emtsev, K. V., Horn, Karsten, Huwald, E., Ley, L., McChesney, Jessica L., ...
Morphology of graphene thin film growth on SiC(0001) (2007)
Ohta, Taisuke, Gabaly, Farid El, Bostwick, Aaron, McChesney, Jessica, Emtsev, Konstantin V., Schmid, Andreas K., ...
Epitaxial films of graphene on SiC(0001) are interesting from a basic physics as well as applications-oriented point of view. Here we study the emerging morphology of in-vacuo prepared graphene films...
Brar, Victor W., Zhang, Yuanbo, Yayon, Yossi, Bostwick, Aaron, Ohta, Taisuke, McChesney, Jessica L., ...
We present a scanning tunneling spectroscopy (STS) study of the local electronic structure of single and bilayer graphene grown epitaxially on a SiC(0001) surface. Low voltage topographic images...
Symmetry Breaking in Few Layer Graphene Films (2007)
Bostwick, Aaron, Ohta, Taisuke, McChesney, Jessica L., Emtsev, Konstantin V., Seyller, Thomas, Horn, Karsten, ...
Recently, it was demonstrated that the quasiparticle dynamics, the layer-dependent charge and potential, and the c-axis screening coefficient could be extracted from measurements of the spectral...
McChesney, Jessica L., Bostwick, Aaron, Ohta, Taisuke, Emtsev, Konstantin V., Seyller, Thomas, Horn, Karsten, ...
The nature of the coupling leading to superconductivity in layered materials such as high-Tc superconductors and graphite intercalation compounds (GICs) is still unresolved. In both systems,...
On or Off? Identifying isomerisation in molecular switches (2007)
Schmidt, Philipp Martin, Püttner, Ralf, Kolczewski, Christiane, Hermann, Klaus, Horn, Karsten, Kampen, Thorsten U.
Conformational isomers of stilbene on Si(1 0 0) (2007)
Schmidt, Philipp Martin, Horn, Karsten, Dil, J. Hugo, Kampen, Thorsten U.
Stilbene (1,2-diphenylethylene) has shown an intriguing isomerisation behavior and may serve as a model system for “molecular switches” incorporating a CC double bond. To evaluate the possible...
On or Off? Identifying isomerisation in molecular switches (2007)
Schmidt, Philipp M., Püttner, R., Kolczewski, Christine, Hermann, Klaus, Horn, Karsten, Kampen, Thorsten U.
Shukla, A. K., Krüger, P., Dhaka, R. S., Sayago, David I., Horn, Karsten, Barman, Sudipto Roy
Using high-resolution core-level photoelectron spectroscopy and modified Anderson impurity model calculations, we study the Mn 2p spectrum of manganese metal and resolve the current debate about its...
Renormalization of graphene bands by many-body interactions (2007)
Bostwick, Aaron, Ohta, Taisuke, McChesney, Jessica L., Seyller, Thomas, Horn, Karsten, Rotenberg, Eli
We have determined the electronic bandstructure of clean and potassium-doped single layer graphene, and fitted the graphene π bands to a first- and third-nearest-neighbor tight binding model. We...
Quantum size effects in Pb/Si(111) investigated by laser-induced photoemission (2007)
Kirchmann, P. S., Wolf, M., Dil, Jan Hugo, Horn, Karsten, Bovensiepen, U.
We use laser-induced photoemission spectroscopy at 6 eV photon energy to investigate quantum well states of epitaxial Pb films on Si(111) as function of film thickness. The binding energies of the...
Spectroscopic Fingerprints of Amine and Imide Functional Groups in Self-Assembled Monolayers (2007)
Ruiz-Osés, Miguel, Kampen, Thorsten U., González-Lakunza, Nora, Silanes, Iñaki, Schmidt-Weber, Philipp M., Gourdon, André, ...
The electronic structures of naphthalene tetracarboxylic diimide (NTCDI) and 1,4-bis(4,6-diamino-1,3,5-triazin-2-yl)benzene (BDG) monolayer assemblies grown on Au(111) are investigated by...
Ohta, Taisuke, Bostwick, Aaron, McChesney, Jessica L., Seyller, Thomas, Horn, Karsten, Rotenberg, Eli
The unusual transport properties of graphene are the direct consequence of a peculiar band structure near the Dirac point. We determine the shape of the π bands and their characteristic splitting,...
Kim, Jeong Won, Kampen, Thorsten U., Horn, Karsten
Adsorption and thermal decomposition of ethylene on Si(1 1 1) have been studied by photoelectron spectroscopy. The evolution of the C 1s and Si 2p core-levels upon the adsorption of the ethylene and...
Quasiparticle dynamics in graphene (2007)
Bostwick, Aaron, Ohta, Taisuke, Seyller, Thomas, Horn, Karsten, Rotenberg, Eli
The effectively massless, relativistic behaviour of graphene's charge carriers—known as Dirac fermions—is a result of its unique electronic structure, characterized by conical valence and...
Role of the electric field in surface electron dynamics above the vacuum level (2007)
Pascual, Jose I., Corriol, C., Ceballos, Gustavo, Aldazabal, I., Rust, Hans-Peter, Horn, Karsten, ...
Circular dichroism of adsorbed chiral molecules (2007)
Kampen, Thorsten U., Kim, Jeong Won, Schmidt, Philipp Martin, Dil, J. Hugo, Horn, Karsten
Electronic structure of biphenyl on Si(100) (2007)
Cranney, M., Comtet, G., Dujardin, G., Kim, Jeong Wong, Kampen, Thorsten U., Horn, Karsten, ...
Symmetry breaking in few layer graphene films (2007)
Bostwick, Aaron, Ohta, Taisuke, McChesney, Jessica L., Emtsev, K. V., Seyller, Thomas, Horn, Karsten, ...
Recently, it was demonstrated that the quasiparticle dynamics, the layer-dependent charge and potential, and the c-axis screening coefficient could be extracted from measurements of the spectral...
Role of the electric field in surface electron dynamics above the vacuum level (2007)
Pascual, Jose I., Corriol, C., Ceballos, Gustavo, Aldazabal, I., Rust, Hans-Peter, Horn, Karsten, ...
Quantum size effects in quasi-free-standing Pb layers (2007)
Dil, Jan Hugo, Kampen, Thorsten U., Huelsen, B., Seyller, T., Horn, Karsten
Electronic and geometric structure of methyl oxirane adsorbed on Si(100) 2 x 1. (2007)
Piancastelli, Maria Novella, Bao, Z., Hennies, F., Travnikova, O., Céolin, D., Kampen, Thorsten, ...
Brar, Victor W., Zhang, Yuanbo, Yayon, Yossi, Ohta, Taisuke, McChesney, Jessica L., Bostwick, Aaron, ...
Band structure and many body effects in graphene (2007)
Bostwick, Aaron, Ohta, Taisuke, McChesney, Jessica L., Seyller, Thomas, Horn, Karsten, Rotenberg, Eli
Interlayer interaction and electronic screening in multilayer graphene (2006)
Ohta, Taisuke, Bostwick, Aaron, McChesney, J. L., Seyller, Thomas, Horn, Karsten, Rotenberg, Eli
The unusual transport properties of graphene are the direct consequence of a peculiar bandstructure near the Dirac point. We determine the shape of the pi bands and their characteristic splitting,...
Electron localisation in metallic quantum wells: Pb versus In on Si(111) (2006)
Dil,Jan Hugo, Kim,Jeong Wong, Kampen,Thorsten U., Horn,Karsten
Two-dimensional quantum well states in ultrathin metal films generally exhibit a dispersion relation of s-p-derived states that can be described through an effective mass of the corresponding bulk...
Electron localisation in metallic quantum wells: Pb versus In on Si(111) (2006)
Dil, Jan Hugo, Kim, Jeong Wong, Kampen, Thorsten U., Horn, Karsten
Two-dimensional quantum well states in ultrathin metal films generally exhibit a dispersion relation of s-p-derived states that can be described through an effective mass of the corresponding bulk...
Controlling the Electronic Structure of Bliayer Graphene (2006)
Ohta, Taisuke, Bostwick, Aaron, Seyller, Thomas, Horn, Karsten, Rotenberg, Eli
We describe the synthesis of bilayer graphene thin films deposited on insulating silicon carbide and report the characterization of their electronic band structure using angle-resolved photoemission....
Bulk electronic structure of metals resolved with scanning tunneling microscopy (2006)
Pascual, Jose I., Dick, A., Hansmann, Martin, Rust, Hans-Peter, Neugebauer, J., Horn, Karsten
Growth and electronic structure of alkali metal adlayers on icosahedral Al70.5Pd21Mn8.5 (2006)
Shukla, A. K., Dhaka, R. S., Biswas, C., Banik, S., Barman, Sudipto Roy, Horn, Karsten, ...
We report x-ray photoelectron spectroscopy (XPS) study of Na and K adlayers on icosahedral Al70.5Pd21Mn8.5 (i-Al-Pd-Mn) quasicrystal. The Na 1s core-level exhibits a continuous linear shift of 0.8 eV...
Quasicrystalline Electronic States of a One-Dimensionally Modulated Ag Film (2006)
Moras, P., Theis, Wolfgang, Ferrari, L., Gardonio, S., Fujii, J., Horn, Karsten, ...
Ag films on GaAs(110) exhibit a one-dimensional quasiperiodic modulation, resulting in a Fibonacci sequence of parallel stripes with two different widths. Valence level photoemission shows that the...
Horn, Karsten, Theis, Wolfgang, Paggel, Jens J., Barman, Sudipto Roy, Rotenberg, Elias, Ebert, Philip, ...
The electronic structure of quasicrystalline Al–Pd–Mn is investigated by means of valence and core level photoelectron spectroscopy. Variations of the photoionization cross section in the...
Atom-Specific Identification of Adsorbed Chiral Molecules by Photoemission (2005)
Kim,Jeong Won, Carbone,Marilena, Dil,Jan Hugo, Tallarida,Massimo, Flammini,R., Casaletto,Maria Pia, ...
The study of chiral adsorbed molecules is important for an analysis of enantioselectivity in heterogeneous catalysis. Here we show that such molecules can be identified through circular dichroism in...
Chen,Chia Hao, Aballe,Lucia, Klauser,Ruth, Kampen,Thorsten U., Horn,Karsten
The valence band discontinuity and the interface formation of the n-type hexagonal GaN/SiC(0 0 0 1) heterointerface have been studied by means of angle-resolved photoelectron spectroscopy using...
Chen, Chia Hao, Aballe, Lucia, Klauser, Ruth, Kampen, Thorsten U., Horn, Karsten
The valence band discontinuity and the interface formation of the n-type hexagonal GaN/SiC(0 0 0 1) heterointerface have been studied by means of angle-resolved photoelectron spectroscopy using...
Atom-Specific Identification of Adsorbed Chiral Molecules by Photoemission (2005)
Kim, Jeong Won, Carbone, Marilena, Dil, Jan Hugo, Tallarida, Massimo, Flammini, R., Casaletto, Maria Pia, ...
The study of chiral adsorbed molecules is important for an analysis of enantioselectivity in heterogeneous catalysis. Here we show that such molecules can be identified through circular dichroism in...
A high resolution photoemission study of phenol adsorption on Si(1 0 0)2 × 1 (2005)
Casaletto, Maria Pia, Carbone, Marilena, Piancastelli, Maria Novella, Horn, Karsten, Weiss, K., Zanoni, R.
The adsorption of a bi-functional organic molecule like phenol on Si(1 0 0)2 × 1 has been investigated by synchrotron radiation-induced photoemission in the valence band, Si 2p, C 1s and O 1s...
Role of spin in quasiparticle interference (2004)
Pascual,José Ignacio, Bihlmayer,G., Koroteev,Yu. M., Rust,Hans-Peter, Ceballos,Gustavo, Hansmann,Martin, ...
Quasiparticle interference patterns measured by scanning tunneling microscopy can be used to study the local electronic structure of metal surfaces and high-temperature superconductors. Here, we show...
Role of spin in quasiparticle interference (2004)
Pascual,Jose I., Bihlmayer,Gustav, Koroteev,Yu. M., Rust,Hans-Peter, Ceballos,Gustavo, Hansmann,Martin, ...
Quasiparticle interference patterns measured by scanning tunneling microscopy can be used to study the local electronic structure of metal surfaces and high-temperature superconductors. Here, we show...
Electronic structure investigations of quasicrystals (2004)
Rotenberg,Eli, Theis,Wolfgang, Horn,Karsten
We present a review of the determination of density of states (DOS) of quasicrystals using valence band photoemission spectroscopy. The absence of fine or spiky structure in the angle-integrated DOS...
Self-organization of Pb thin films on Cu(111) induced by quantum size effects (2004)
Dil,Jan Hugo, Kim,Jeong Won, Gokhale,Shubha, Tallarida,Massimo, Horn,Karsten
Electron confinement in thin films of Pb on Cu(111) leads to the formation of quantum well states, formed out of the upper valence band of Pb. Their evolution as a function of film thickness is...
Adsorption of 2,3-butanediol on Si(1 0 0) (2004)
Kim,Jeong Won, Carbone,Marilena, Tallarida,Massimo, Dil,Jan Hugo, Horn,Karsten, Casaletto,Maria Pia, ...
The adsorption of 2,3-butanediol on a Si(1 0 0) surface has been investigated by photoelectron spectroscopy. The valence band spectra show features assigned to molecular orbitals of 2,3-butanediol by...
Collective excitations on silver surfaces studied by photoyield (2004)
Barman,Sudipto R., Biswas,C., Horn,Karsten
The surface electronic structure of Ag has been studied using angle and energy resolved photoyield (AERPY) using low photon energies (2.7–18 eV). The adlayer standing-wave-like bulk plasmon mode is...
Zheng,J. C., Huan,C. H. A., Wee,A. T. S., Van Hove,M. A., Fadley,Charles S., Shi,F. J., ...
The atomic-scale structure of the fivefold symmetric surface of an AlPdMn quasicrystal is investigated quantitatively by comparing x-ray photoelectron diffraction simulations to experiment. The...
Thin manganese films on Si(111)-(7x7): electronic structure and strain in silicide formation (2004)
Kumar,Ashwani, Tallarida,Massimo, Hansmann,Martin, Starke,Ullrich, Horn,Karsten
The electronic and structural properties of thin epitaxial Mn films on Si(111)-(7 × 7) and their silicide reaction are studied by means of low-energy electron diffraction, scanning tunnelling...
Electronic excitations on silver surfaces (2004)
Barman,Sudipto R., Biswas,C., Horn,Karsten
The surface electronic structure and optical response of Ag has been studied using angle- and energy-resolved photoyield (AERPY) and angle-resolved photoemission spectroscopy (ARPES) using low energy...
Influence of bulk doping type on the Li adsorption site on Si(111)-(1x1): H (2004)
Paggel,Jens J., Mannstedt,W., Weindel,C., Hasselblatt,Markus, Horn,Karsten, Fick,Dieter
The model surface Si(111)-(1x1):H is used as a substrate for the adsorption of submonolayer amounts of Li. For n-doped substrates a peak right at the conduction band minimum is found in photoemission...
Reconstruction of cleaved 6H-SiC surfaces (2004)
Starke,UIrich, Tallarida,Massimo, Kumar,Ashwani, Horn,Karsten, Seifarth,O., Kipp,L.
Cleaved surfaces of silicon carbide were investigated using low-energy electron diffraction (LEED) and core level photoelectron spectroscopy (PES). Despite the hardness of SiC, cleavage is possible...
Influence of bulk doping type on the Li adsorption site on Si(111)-(1x1): H (2004)
Paggel, Jens J., Mannstadt, Wolfgang, Weindel, Christian, Hasselblatt, Markus, Horn, Karsten, Fick, Dieter
The model surface Si(111)-(1x1):H is used as a substrate for the adsorption of submonolayer amounts of Li. For n-doped substrates a peak right at the conduction band minimum is found in photoemission...
Electronic excitations on silver surfaces (2004)
Barman, Sudipto R., Biswas, C., Horn, Karsten
The surface electronic structure and optical response of Ag has been studied using angle- and energy-resolved photoyield (AERPY) and angle-resolved photoemission spectroscopy (ARPES) using low energy...
Thin manganese films on Si(111)-(7x7): electronic structure and strain in silicide formation (2004)
Kumar, Ashwani, Tallarida, Massimo, Hansmann, Martin, Starke, Ullrich, Horn, Karsten
The electronic and structural properties of thin epitaxial Mn films on Si(111)-(7 × 7) and their silicide reaction are studied by means of low-energy electron diffraction, scanning tunnelling...
Zheng, J. C., Huan, C. H. A., Wee, A. T. S., Van Hove, M. A., Fadley, Charles S., Shi, F. J., ...
The atomic-scale structure of the fivefold symmetric surface of an AlPdMn quasicrystal is investigated quantitatively by comparing x-ray photoelectron diffraction simulations to experiment. The...
Adsorption of 2,3-butanediol on Si(1 0 0) (2004)
Kim, Jeong Won, Carbone, Marilena, Tallarida, Massimo, Dil, Jan Hugo, Horn, Karsten, Casaletto, Maria Pia, ...
The adsorption of 2,3-butanediol on a Si(1 0 0) surface has been investigated by photoelectron spectroscopy. The valence band spectra show features assigned to molecular orbitals of 2,3-butanediol by...
Self-organization of Pb thin films on Cu(111) induced by quantum size effects (2004)
Dil, Jan Hugo, Kim, Jeong Won, Gokhale, Shubha, Tallarida, Massimo, Horn, Karsten
Electron confinement in thin films of Pb on Cu(111) leads to the formation of quantum well states, formed out of the upper valence band of Pb. Their evolution as a function of film thickness is...
Physics: Charging atoms, one by one (2004)
The scanning tunneling microscope (STM) made it possible to manipulate atoms and move them around. Now researchers are discovering how to alter the chemical properties of individual atoms. In his...
Electronic structure investigations of quasicrystals (2004)
Rotenberg, Eli, Theis, Wolfgang, Horn, Karsten
We present a review of the determination of density of states (DOS) of quasicrystals using valence band photoemission spectroscopy. The absence of fine or spiky structure in the angle-integrated DOS...
Reconstruction of cleaved 6H-SiC surfaces (2004)
Starke, UIrich, Tallarida, Massimo, Kumar, Ashwani, Horn, Karsten, Seifarth, O., Kipp, L.
Cleaved surfaces of silicon carbide were investigated using low-energy electron diffraction (LEED) and core level photoelectron spectroscopy (PES). Despite the hardness of SiC, cleavage is possible...
Collective excitations on silver surfaces studied by photoyield (2004)
Barman, Sudipto R., Biswas, C., Horn, Karsten
The surface electronic structure of Ag has been studied using angle and energy resolved photoyield (AERPY) using low photon energies (2.7–18 eV). The adlayer standing-wave-like bulk plasmon mode is...
Role of spin in quasiparticle interference (2004)
Pascual, José Ignacio, Bihlmayer, G., Koroteev, Yu. M., Rust, Hans-Peter, Ceballos, Gustavo, Hansmann, Martin, ...
Quasiparticle interference patterns measured by scanning tunneling microscopy can be used to study the local electronic structure of metal surfaces and high-temperature superconductors. Here, we show...
Role of spin in quasiparticle interference (2004)
Pascual, Jose I., Bihlmayer, Gustav, Koroteev, Yu. M., Rust, Hans-Peter, Ceballos, Gustavo, Hansmann, Martin, ...
Quasiparticle interference patterns measured by scanning tunneling microscopy can be used to study the local electronic structure of metal surfaces and high-temperature superconductors. Here, we show...
Electronic valence bands in decagonal Al-Ni-Co (2003)
Theis,Wolfgang, Rotenberg,Eli, Franke,Katharina J., Gille,P., Horn,Karsten
Valence-band photoemission from the s-p region of the tenfold and the two inequivalent twofold surfaces of quasicrystalline decagonal Al71.8Ni14.8Co13.4 reveals strongly dispersing bands. These...