141 citations · 549 across the 13 of their papers we have counts for
13 papers
In-situ study and modeling of the reaction kinetics during molecular beam epitaxy of GeO2 and its etching by Ge
Wenshan Chen, Kingsley Egbo, Hans Tornatzky +3
Rutile GeO2 has been predicted to be an ultra-wide bandgap semiconductor suitable for future power electronics devices while quartz-like GeO2 shows piezoelectric properties. To exp…
Fingerprints of carbon defects in vibrational spectra of gallium nitride (GaN) consider-ing the isotope effect
I. Gamov, J. L. Lyons, G. Gärtner +5
This work examines the carbon defects associated with recently reported and novel peaks of infrared (IR) absorption and Raman scattering appearing in GaN crystals at carbon ($^{12}…
First and Second Order Raman Spectroscopy of Monoclinic
Benjamin M. Janzen, Roland Gillen, Zbigniew Galazka +2
We employ a combined experimental-theoretical study of the first- and second-order Raman modes of monoclinic -GaO. The investigated materials is of particular intere…
Anisotropic Thermoreflectance Thermometry: A contactless frequency-domain approach to study anisotropic thermal transport
L. A. Perez, K. Xu, M. R. Wagner +6
We developed a novel contactless frequency-domain approach to study thermal transport, which is particularly convenient when thermally anisotropic materials are considered. The met…
Isotopic study of Raman active phonon modes in -GaO
Benjamin M. Janzen, Piero Mazzolini, Roland Gillen +5
Holding promising applications in power electronics, the wide band gap material gallium oxide has emerged as a vital alternative to materials like GaN and SiC. The detailed study o…
Influence of Polymorphism on the Electronic Structure of GaO
Jack E. N. Swallow, Christian Vorwerk, Piero Mazzolini +21
The search for new wide band gap materials is intensifying to satisfy the need for more advanced and energy efficient power electronic devices. GaO has emerged as an altern…
Strong near-field light-matter interaction in plasmon-resonant tip-enhanced Raman scattering in indium nitride
Emanuele Poliani, Daniel Seidlitz, Maximilian Ries +4
We report a detailed study of the strong near-field Raman scattering enhancement which takes place in tip-enhanced Raman scattering (TERS) in indium nitride. In addition to the wel…
Tuning of the Quantum-Confined Stark Effect in Wurtzite Group-III-Nitride Nanostructures by the Internal-Field-Guarded-Active-Region Design
S. Schlichting, G. M. O. Hönig, J. Müßener +9
Recently, we suggested an unconventional approach [the so-called Internal-Field-Guarded-Active-Region Design (IFGARD)] for the elimination of the crystal polarization field induced…
Electronic excitations stabilised by a degenerate electron gas in semiconductors
C. Nenstiel, G. Callsen, F. Nippert +10
Excitons in semiconductors and insulators consist of fermionic subsystems, electrons and holes, whose attractive interaction facilitates bound quasiparticles with quasi-bosonic cha…
Two-Dimensional Phononic Crystals: Disorder Matters
Markus R. Wagner, Bartlomiej Graczykowski, Juan Sebastian Reparaz +4
The design and fabrication of phononic crystals (PnCs) hold the key to control the propagation of heat and sound at the nanoscale. However, there is a lack of experimental studies…
Optical and mechanical properties of nanofibrillated cellulose: towards a robust platform for next-generation green technologies
Claudia D. Simao, Juan S. Reparaz, Markus. R. Wagner +8
Nanofibrillated cellulose, a polymer that can be obtained from one of the most abundant biopolymers in Nature, is being increasingly explored due to its outstanding properties for…
Effects of strain on the valence band structure and exciton-polariton energies in ZnO
Markus R. Wagner, Gordon Callsen, Juan S. Reparaz +6
The uniaxial stress dependence of the band structure and the exciton-polariton transitions in wurtzite ZnO is thoroughly studied using modern first-principles calculations based on…
A novel high resolution contactless technique for thermal field mapping and thermal conductivity determination: Two-Laser Raman Thermometry
J. S. Reparaz, E. Chavez-Angel, M. R. Wagner +4
We present a novel high resolution contactless technique for thermal conductivity determination and thermal field mapping based on creating a thermal distribution of phonons using…