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7 papers · 2 filters
Speeding up the solution of the Bethe-Salpeter equation by a double-grid method and Wannier interpolation
David Kammerlander, Silvana Botti, Miguel A. L. Marques +2
The Bethe-Salpeter equation is a widely used approach to describe optical excitations in bulk semiconductors. It leads to spectra that are in very good agreement with experiment, b…
Nanometer Scale Spectral Imaging of Quantum Emitters in Nanowires and Its Correlation to Their Atomically Resolved Structure
Luiz Fernando Zagonel, Stefano Mazzucco, Marcel Tencé +9
We report the spectral imaging in the UV to visible range with nanometer scale resolution of closely packed GaN/AlN quantum disks in individual nanowires using an improved custom-m…
The Effects of Post-Thermal Annealing on the Emission Spectra of GaAs/AlGaAs Quantum Dots grown by Droplet Epitaxy
Pilkyung Moon, J. D. Lee, S. K. Ha +5
We fabricated GaAs/AlGaAs quantum dots by droplet epitaxy method, and obtained the geometries of the dots from scanning transmission electron microscopy data. Post-thermal annealin…
Polarity determination in ZnSe nanowires by HAADF STEM
Martien Den Hertog, Miryam Elouneg-Jamroz, Edith Bellet-Amalric +7
High angle annular dark field scanning transmission electron microscopy is used to analyze the polarity of ZnSe nanowires grown, by molecular beam epitaxy, on GaAs substrates. The…
Direct Observation of Massless Domain Wall Dynamics in Nanostripes with Perpendicular Magnetic Anisotropy
Jan Vogel, Marlio Bonfim, Nicolas Rougemaille +8
Domain wall motion induced by nanosecond current pulses in nanostripes with perpendicular magnetic anisotropy (Pt/Co/AlO) is shown to exhibit negligible inertia. Time-resolved…
Intrinsic limits governing MBE growth of Ga-assisted GaAs nanowires on Si(111)
Le Thuy Thanh Giang, C. Bougerol, H. Mariette +1
Diffusion-enhanced and desorption-limited growth regimes of Ga-assisted GaAs nanowires were identified. In the latter regime, the number of vertical NWs with a narrow length distri…