258 citations · 903 across the 15 of their papers we have counts for
15 papers
Ultrafast dynamics of hot charge carriers in an oxide semiconductor probed by femtosecond spectroscopic ellipsometry
Steffen Richter, Oliver Herrfurth, Shirly Espinoza +8
Many linked processes occur concurrently in strongly excited semiconductors, such as interband and intraband absorption, scattering of electrons and holes by the heated lattice, Pa…
Optical properties of thin-film vanadium dioxide from the visible to the far infrared
Chenghao Wan, Zhen Zhang, David Woolf +13
The insulator-to-metal transition (IMT) in vanadium dioxide (VO2) can enable a variety of optics applications, including switching and modulation, optical limiting, and tuning of o…
Strain and Band-Gap Engineering in Ge-Sn Alloys via P Doping
Slawomir Prucnal, Yonder Berencén, Mao Wang +19
Ge with a quasi-direct band gap can be realized by strain engineering, alloying with Sn, or ultrahigh n-type doping. In this work, we use all three approaches together to fabricate…
Exceptional points in anisotropic planar microcavities
Steffen Richter, Tom Michalsky, Chris Sturm +3
Planar microcavities allow the control and manipulation of spin-polarization, manifested in phenomena like the optical spin Hall effect due to the intrinsic polarization mode split…
Raman tensor elements of
Christian Kranert, Chris Sturm, Rüdiger Schmidt-Grund +1
The Raman spectrum and particularly the Raman scattering intensities of monoclinic are investigated by experiment and theory. The low symmetry of $β\text{…
Coexistence of strong and weak coupling in ZnO nanowire cavities
Tom Michalsky, Helena Franke, Robert Buschlinger +3
We present a high quality two-dimensional cavity structure based on ZnO nanowires coated with concentrical Bragg reflectors. The spatial mode distribution leads to the simultaneous…
Dipole Analysis of the Dielectric Function of Colour Dispersive Materials: Application to Monoclinic GaO
Chris Sturm, Rüdiger Schmidt-Grund, Christian Kranert +3
We apply a generalized model for the determination and analysis of the dielectric function of optically anisotropic materials with colour dispersion to phonon modes and show that i…
Carrier density driven lasing dynamics in ZnO nanowires
Marcel Wille, Chris Sturm, Tom Michalsky +4
We report on the temporal lasing dynamics of high quality ZnO nanowires using time-resolved micro-photoluminescence technique. The temperature dependence of the lasing characterist…
Dielectric tensor of monoclinic GaO single crystals in the spectral range eV
Chris Sturm, Jürgen Furthmüller, Friedhelm Bechstedt +2
The dielectric tensor of -GaO was determined by generalized spectroscopic ellipsometry in a wide spectral range from to as well as…
Comparative Study of Optical and Magneto-Optical Properties of Normal, Disordered and Inverse Spinel Type Oxides
Vitaly Zviagin, Peter Richter, Tammo Böntgen +6
CoO, ZnFeO, CoFeO, ZnCoO, and FeO thin films were fabricated by pulsed laser deposition at high and low temperatures resulting in crystallin…
Discrete relaxation of exciton-polaritons in an inhomogeneous potential
T. Michalsky, H. Franke, C. Sturm +2
We present indications, that the wave function-stiffness condition during energy-relaxation as observed in single-phase state quantum systems manifests also in a single particle en…
Room-temperature condensation in whispering gallery microresonators assisted by longitudinal optical phonons
Christof P. Dietrich, Rüdiger Schmidt-Grund, Tom Michalsky +2
We report condensation of hexagonal whispering gallery modes (WGM) at room temperature in ZnO microwires that embody nearly perfect polygonal whispering gallery microresonators. Th…
Cavity Polariton Condensate in a Disordered Environment
Martin Thunert, Alexander Janot, Helena Franke +7
We report on the influence of disorder on an exciton-polariton condensate in a ZnO based bulk planar microcavity and compare experimental results with a theoretical model for a non…
Phonon-Assisted Lasing in ZnO Microwires at Room Temperature
T. Michalsky, M. Wille, C. P. Dietrich +4
We report on room temperature phonon-assisted whispering gallery mode (WGM) lasing in ZnO microwires. For WGM laser action on the basis of the low gain phonon scattering process hi…
Electronic excitations and structure of Li2IrO3 thin films grown on ZrO:Y (001) substrates
Marcus Jenderka, Rüdiger Schmidt-Grund, Marius Grundmann +1
Thin films are a prerequisite for application of the emergent exotic ground states in iridates that result from the interplay of strong spin-orbit coupling and electronic correlati…