Publications (31)
Electronic Band Structure Mapping of Nanotube Transistors by Scanning Photocurrent Microscopy
E. J. H. Lee, K. Balasubramanian, J. Dorfmueller +5
Spatially resolved photocurrent measurements on carbon nanotube field-effect transistors (CNFETs) operated in various transport regimes are reported. It is demonstrated that the ph…
Complex trend of magnetic order in Fe clusters on 4 transition-metal surfaces
V. Sessi, F. Otte, S. Krotzky +6
We demonstrate the occurrence of compensated spin configurations in Fe clusters and monolayers on Ru(0001) and Rh(111) by a combination of X-ray magnetic circular dichroism experim…
Evidence of reduced surface electron-phonon scattering in the conduction band of Bi_{2}Se_{3} by non-equilibrium ARPES
A. Crepaldi, F. Cilento, B. Ressel +11
The nature of the Dirac quasiparticles in topological insulators calls for a direct investigation of the electron-phonon scattering at the \emph{surface}. By comparing time-resolve…
Single 3 transition metal atoms on multi-layer graphene systems: electronic configurations, bonding mechanisms and role of the substrate
V. Sessi, S. Stepanow, A. N. Rudenko +8
The electronic configurations of Fe, Co, Ni, and Cu adatoms on graphene and graphite have been studied by x-ray magnetic circular dichroism and charge transfer multiplet theory. A…
Absence of local magnetic moments in Ru and Rh impurities and clusters on Ag(100) and Pt(997)
J. Honolka, K. Kuhnke, L. Vitali +8
The magnetism of quench-condensed Ru and Rh impurities and metal films on Ag(100) and Pt(997) has been studied using x-ray magnetic circular dichroism. In the coverage range betwee…
Origin of Rashba-splitting in the quantized subbands at Bi2Se3 surface
H. M. Benia, A. Yaresko, A. P. Schnyder +4
We study the band structure of the topological insulator (111) surface using angle-resolved photoemission spectroscopy. We examine the situation where two…
Manipulation of electrical and ferromagnetic properties of photo-sensitized (Ga,Mn)As
L. Herrera Diez, M. Konuma, E. Placidi +6
We present the manipulation of magnetic and electrical properties of (Ga,Mn)As by the adsorption of dye-molecules as a first step towards the realization of light-controlled magnet…
Kondo effect of Co adatoms on Ag monolayers on noble metal surfaces
M. A. Schneider, P. Wahl, L. Diekhöner +3
The Kondo temperature of single Co adatoms on monolayers of Ag on Cu and Au(111) is determined using Scanning Tunneling Spectroscopy. of Co on a single monolayer of Ag…
Universal shapes of self-organized semiconductor quantum dots
G. Costantini, A. Rastelli, C. Manzano +4
The model systems for self-organized quantum dots formed from elemental and compound semiconductors, namely Ge grown on Si(001) and InAs on GaAs(001), are comparatively studied by…
Strong paramagnon scattering in single atom Pd contacts
V. Schendel, C. Barreteau, M. Brandbyge +6
Among all transition metals, Palladium (Pd) has the highest density of states at the Fermi energy yet does not fulfill the Stoner criterion for ferromagnetism. However, its close v…
In-plane magnetic anisotropy of Fe atoms on BiSe(111)
J. Honolka, A. A. Khajetoorians, V. Sessi +11
The robustness of the gapless topological surface state hosted by a 3D topological insulator against perturbations of magnetic origin has been the focus of recent investigations. W…
Hierarchical Triggering of Star Formation by Superbubbles in W3/W4
M. S. Oey, A. M. Watson, K. Kern +1
It is generally believed that expanding superbubbles and mechanical feedback from massive stars trigger star formation, because there are numerous examples of superbubbles showing…
Phonon and plasmon excitation in inelastic electron tunneling spectroscopy of graphite
L. Vitali, M. A. Schneider, K. Kern +2
The inelastic electron tunneling spectrum (IETS)of highly oriented pyrolitic graphite (HOPG) has been measured with scanning tunneling spectroscopy (STS) at 6K. The observed spectr…
Quasiparticle Chirality in Epitaxial Graphene Probed at the Nanometer Scale
I. Brihuega, P. Mallet, C. Bena +7
Graphene exhibits unconventional two-dimensional electronic properties resulting from the symmetry of its quasiparticles, which leads to the concepts of pseudospin and electronic c…
Silicon surface with giant spin-splitting
I. Gierz, T. Suzuki, E. Frantzeskakis +7
We demonstrate the induction of 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…
Superconducting Quantum Interference at the Atomic Scale
S. Karan, H. Huang, C. Padurariu +9
A single spin in a Josephson junction can reverse the flow of the supercurrent. At mesoscopic length scales, such -junctions are employed in various instances from finding the…
Giant ambipolar Rashba effect in a semiconductor: BiTeI
A. Crepaldi, L. Moreschini, G. Autès +11
We observe a giant spin-orbit splitting in bulk and surface states of the non-centrosymmetric semiconductor BiTeI. We show that the Fermi level can be placed in the valence or in t…
Temperature dependent Neel wall dynamics in GaMnAs/GaAs
J. Honolka, L. Herrera Diez, R. K. Kremer +3
Extensive Kerr microscopy studies reveal a strongly temperature dependent domain wall dynamics in Hall-bars made from compressively strained GaMnAs. Depending on the temperature ma…
Kondo temperature of magnetic impurities at surfaces
P. Wahl, L. Diekhöner, M. A. Schneider +3
Based on the experimental observation, that only the close vicinity of a magnetic impurity at metal surfaces determines its Kondo behaviour, we introduce a simple model which expla…
Intercalation of graphene on SiC(0001) via ion-implantation
A. Stöhr, S. Forti, S. Link +4
Electronic devices based on graphene technology are catching on rapidly and the ability to engineer graphene properties at the nanoscale is becoming, more than ever, indispensable.…
All-Optical and Microwave-Free Detection of Meissner Screening using Nitrogen-Vacancy Centers in Diamond
D. Paone, D. Pinto, G. Kim +9
Microscopic studies on thin film superconductors play an important role for probing non-equilibrium phase transitions and revealing dynamics at the nanoscale. However, magnetic sen…
Complex domain wall dynamics in compressively strained GaMnAs epilayers
L. Herrera Diez, R. K. Kremer, A. Enders +6
The domain wall induced reversal dynamics in compressively strained GaMnAs was studied employing the magneto-optical Kerr effect and Kerr microscopy. Due to the influence of an uni…
Observation of Dirac surface states in the noncentrosymmetric superconductor BiPd
H. M. Benia, E. Rampi, C. Trainer +12
Materials with strong spin-orbit coupling (SOC) have in recent years become a subject of intense research due to their potential applications in spintronics and quantum information…
Ultrafast photodoping and effective Fermi-Dirac distribution of the Dirac particles in Bi2Se3
A. Crepaldi, B. Ressel, F. Cilento +7
We exploit time- and angle- resolved photoemission spectroscopy to determine the evolution of the out-of-equilibrium electronic structure of the topological insulator Bi2Se. The re…
Local pressure-induced metallization of a semiconducting carbon nanotube in a crossed junction
L. Vitali, M. Burghard, P. Wahl +2
The electronic and vibrational density of states of a semiconducting carbon nanotube in a crossed junction was investigated by elastic and inelastic scanning tunneling spectroscopy…
Quantum Coherence of Image-Potential States
P. Wahl, M. A. Schneider, L. Diekhöner +2
The quantum dynamics of the two-dimensional image-potential states in front of the Cu(100) surface is measured by scanning tunneling microscopy (STM) and spectroscopy (STS). The di…
Cobalt nano-clusters on metal supported Xe monolayers: influence of the substrate on cluster formation kinetics and magnetism
V. Sessi, K. Kuhnke, A. Enders +7
The growth dynamics of submonolayer coverages of Cobalt during buffer layer assisted growth on Ag(111) and Pt(111) substrates is investigated by variable temperature scanning tunne…
Role of pseudospin in quasiparticle interferences in epitaxial graphene probed by high-resolution scanning tunneling microscopy
P. Mallet, I. Brihuega, S. Bose +4
Pseudospin, an additional degree of freedom related to the honeycomb structure of graphene, is responsible of many of the outstanding electronic properties found in this material.…
Exchange interaction between single magnetic adatoms
P. Wahl, P. Simon, L. Diekhoener +4
The magnetic coupling between single Co atoms adsorbed on a copper surface is determined by probing the Kondo resonance using low-temperature scanning tunneling spectroscopy. The K…
Extensive study of the quality of fission yields from experiment, evaluation and GEF for antineutrino studies and applications
K. -H. Schmidt, M. Estienne, M. Fallot +6
The understanding of the antineutrino production in fission and the theoretical calculation of their energy spectra in different types of fission reactors rely on the application o…
Magnetic Anisotropy of Deposited Transition Metal Clusters
S. Bornemann, J. Minár, J. B. Staunton +4
We present results of magnetic torque calculations using the fully relativistic spin-polarized Korringa-Kohn-Rostoker approach applied to small Co and Fe clusters deposited on the…