Three-Dimensional Magneto-Photoluminescence as a Probe of the Electronic Properties of Crystal-Phase Quantum Disks in GaAs Nanowires

Nano Letters ◽  
2013 ◽  
Vol 13 (11) ◽  
pp. 5303-5310 ◽  
Author(s):  
Pierre Corfdir ◽  
Barbara Van Hattem ◽  
Emanuele Uccelli ◽  
Sònia Conesa-Boj ◽  
Pierre Lefebvre ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Three Dimensional ◽  
Crystal Phase ◽  
Gaas Nanowires ◽  
Quantum Disks

Crystal phase and growth orientation dependence of GaAs nanowires on NixGay seeds via vapor-solid-solid mechanism

2011 ◽  
Vol 99 (8) ◽  
pp. 083114 ◽  
Author(s):  
Ning Han ◽  
Alvin T. Hui ◽  
Fengyun Wang ◽  
Jared J. Hou ◽  
Fei Xiu ◽  
...  
Keyword(s):  
Orientation Dependence ◽  
Crystal Phase ◽  
Growth Orientation ◽  
Gaas Nanowires

scholarly journals Crystal phase engineering of self-catalyzed GaAs nanowires using a RHEED diagram

2020 ◽  
Vol 2 (5) ◽  
pp. 2127-2134 ◽  
Author(s):  
T. Dursap ◽  
M. Vettori ◽  
A. Danescu ◽  
C. Botella ◽  
P. Regreny ◽  
...  
Keyword(s):  
Contact Angle ◽  
Crystalline Structure ◽  
Crystal Phase ◽  
Catalyst Droplet ◽  
Wetting Contact Angle ◽  
Gaas Nanowires ◽  
Phase Engineering

It is well known that the crystalline structure of the III–V nanowires (NWs) is mainly controlled by the wetting contact angle of the catalyst droplet which can be tuned by the III and V flux.

Determination of crystal phase from an electron backscatter diffraction pattern

2009 ◽  
Vol 42 (2) ◽  
pp. 234-241 ◽  
Author(s):  
David J. Dingley ◽  
Stuart I. Wright
Keyword(s):  
Crystal Orientation ◽  
Electron Backscatter Diffraction ◽  
Hexagonal Phase ◽  
Three Dimensional ◽  
Lattice Parameters ◽  
Crystal Phase ◽  
Test Case ◽  
Electron Backscatter ◽  
Ebsd Pattern ◽  
Backscatter Diffraction

Electron backscatter diffraction (EBSD) is a scanning electron microscope-based technique principally used for the determination and mapping of crystal orientation. This work describes an adaptation of the EBSD technique into a potential tool for crystal phase determination. The process can be distilled into three steps: (1) extracting a triclinic cell from a single EBSD pattern, (2) identifying the crystal symmetry from an examination of the triclinic cell, and (3) determining the lattice parameters. The triclinic cell is determined by finding the bands passing through two zone axes in the pattern including a band connecting the two. A three-dimensional triclinic unit cell is constructed based on the identified bands. The EBSD pattern is indexed in terms of the triclinic cell thus formed and the crystal orientation calculated. The pattern indexing results in independent multiple orientations due to the symmetry the crystal actually possesses. By examining the relationships between these multiple orientations, the crystal system is established. By comparing simulated Kikuchi bands with the pattern the lattice parameters can be determined. Details of the method are given for a test case of EBSD patterns obtained from the hexagonal phase of titanium.

scholarly journals Suppression of three dimensional twinning for a 100% yield of vertical GaAs nanowires on silicon

Nanoscale ◽  
2012 ◽  
Vol 4 (5) ◽  
pp. 1486 ◽  
Author(s):  
Eleonora Russo-Averchi ◽  
Martin Heiss ◽  
Lionel Michelet ◽  
Peter Krogstrup ◽  
Jesper Nygard ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Gaas Nanowires

Stability, Electronic Properties, and Structural Isomerism in Small Copper Clusters

2012 ◽  
Vol 1479 ◽  
pp. 15-20
Author(s):  
Juan M. Montejano-Carrizales ◽  
Faustino Aguilera-Granja ◽  
Ricardo A. Guirado-López
Keyword(s):  
Electronic Properties ◽  
Density Functional ◽  
Three Dimensional ◽  
Density Functional Theory Calculations ◽  
Energy Barriers ◽  
Elastic Band ◽  
Experimental Conditions ◽  
Atomic Displacements ◽  
Structural Isomerism ◽  
The Stability

ABSTRACTWe present extensive pseudopotential density functional theory calculations dedicated to analyze the stability, electronic properties, and structural isomerism in Cu6 clusters. We consider structures of different symmetries and charge states. Our total energy calculations reveal a strong competition between two- and three-dimensional atomic arrays, the later being mostly energetically preferred for the anionic structures. The bond lengths and electronic spectra strongly depend on the local atomic environment, a result that is expected to strongly influence the catalytic activity of our clusters. Using the nudged elastic band method we analyze the interconversion processes between different Cu6 isomers. Complex atomic relaxations are obtained when we study the transition between different cluster structures; however relatively small energy barriers of approximately 0.3 eV accompany the atomic displacements. Interestingly, we obtain that by considering positively charged Cu6+ systems we reduce further the energy barriers opposing the interconversion process. The previous results could imply that, under a range of experimental conditions, it should be possible to observe different Cu6cluster structures in varying proportions.

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