69 citations · 143 across the 8 of their papers we have counts for
8 papers
When heat goes astray -- non-local heating in a semiconductor
Mahmoud Elhajhasan, Elena Trukhan, Katharina Dudde +8
Heating of semiconductor devices limits their performance and lifetime, which must be addressed by thermal management starting at the heat source. It is a common assumption that th…
Thermal analysis of GaN-based photonic membranes for optoelectronics
Wilken Seemann, Mahmoud Elhajhasan, Julian Themann +11
Semiconductor membranes find their widespread use in various research fields targeting medical, biological, environmental, and optical applications. Often such membranes derive the…
Optical and thermal characterization of a group-III nitride semiconductor membrane by microphotoluminescence spectroscopy and Raman thermometry
Mahmoud Elhajhasan, Wilken Seemann, Katharina Dudde +9
We present the simultaneous optical and thermal analysis of a freestanding photonic semiconductor membrane made from wurtzite III-nitride material. By linking micro-photoluminescen…
Single photon emission and recombination dynamics in self-assembled GaN/AlN quantum dots
Johann Stachurski, Sebastian Tamariz, Gordon Callsen +2
III-nitride quantum dots (QDs) are a promising system actively studied for their ability to maintain single photon emission up to room temperature. Here, we report on the evolution…
Towards bright and pure single photon emitters at 300 K based on GaN quantum dots on silicon
Sebastian Tamariz, Gordon Callsen, Johann Stachurski +3
Quantum dots (QDs) based on III-nitride semiconductors are promising for single photon emission at non-cryogenic temperatures due to their large exciton binding energies. Here, we…
Probing alloy formation using different excitonic species: The particular case of InGaN
Gordon Callsen, Raphaël Butté, Nicolas Grandjean
Since the early 1960s, alloys are commonly grouped into two classes, featuring bound states in the bandgap (I) or additional, non-discrete band states (II). Microscopic material pa…
On thresholdless lasing features in high- nitride nanobeam cavities: a quantum optical study
Stefan T. Jagsch, Noelia Vico Triviño, Frederik Lohof +11
Exploring the limits of spontaneous emission coupling is not only one of the central goals in the development of nanolasers, it is also highly relevant regarding future large-scale…
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…