119 citations · 436 across the 9 of their papers we have counts for
9 papers
Molecular Beam Epitaxy of GaN Nanowires on Epitaxial Graphene
Sergio Fernández-Garrido, Manfred Ramsteiner, Guanhui Gao +10
We demonstrate an all-epitaxial and scalable growth approach to fabricate single-crystalline GaN nanowires on graphene by plasma-assisted molecular beam epitaxy. As substrate, we e…
Bismuth-surfactant-induced growth and structure of InAs/GaAs(110) quantum dots
Ryan B. Lewis, Achim Trampert, Esperanza Luna +3
We explore the Bi-surfactant-directed self-assembly and structure of InAs quantum dots grown on GaAs(110) by molecular beam epitaxy. The addition of a Bi flux during InAs depositio…
Quantum dot self-assembly driven by a surfactant-induced morphological instability
Ryan B. Lewis, Pierre Corfdir, Hong Li +4
In strained heteroepitaxy, two-dimensional (2D) layers can exhibit a critical thickness at which three-dimensional (3D) islands self-assemble, relieving misfit strain at the cost o…
Dislocation contrast in cathodoluminescence and electron-beam induced current maps on GaN(0001)
K. K. Sabelfeld, V. M. Kaganer, C. Pfüller +1
We theoretically analyze the contrast observed at the outcrop of a threading dislocation at the GaN(0001) surface in cathodoluminescence and electron-beam induced current maps. We…
Nature of excitons bound to inversion domain boundaries: Origin of the 3.45-eV luminescence lines in spontaneously formed GaN nanowires on Si(111)
Carsten Pfüller, Pierre Corfdir, Christian Hauswald +9
We investigate the 3.45-eV luminescence band of spontaneously formed GaN nanowires on Si(111) by photoluminescence and cathodoluminescence spectroscopy. This band is found to be pa…
Correlation between In content and emission wavelength of InGaN/GaN nanowire heterostructures
Martin Wölz, Jonas Lähnemann, Oliver Brandt +7
GaN nanowire ensembles with axial InGaN multi-quantum wells (MQWs) were grown by molecular beam epitaxy. In a series of samples, we varied the In content in the MQWs from almost ze…
Macro- and micro-strain in GaN nanowires on Si(111)
Bernd Jenichen, Oliver Brandt, Carsten Pfueller +3
We analyze the strain state of GaN nanowire ensembles by x-ray diffraction. The nanowires are grown by molecular beam epitaxy on a Si(111) substrate in a self-organized manner. On…
Direct experimental determination of the spontaneous polarization of GaN
Jonas Lähnemann, Oliver Brandt, Uwe Jahn +8
We present a universal approach for determining the spontaneous polarization Psp of a wurtzite semiconductor from the emission energies of excitons bound to the different types of…
Coexistence of quantum-confined Stark effect and localized states in an (In,Ga)N/GaN nanowire heterostructure
Jonas Lähnemann, Oliver Brandt, Carsten Pfüller +7
We analyze the emission of single GaN nanowires with (In,Ga)N insertions using both micro-photoluminescence and cathodoluminescence spectroscopy. The emission spectra are dominated…