32 research outputs found
Anisotropic structural and optical properties of a-plane (11-20) AlInN nearly-lattice-matched to GaN
We report epitaxial growth of a-plane (11-20) AlInN layers
nearly-lattice-matched to GaN. Unlike for c-plane oriented epilayers, a-plane
Al_{1-x}In_{x}N cannot be simultaneously lattice-matched to GaN in both
in-plane directions. We study the influence of temperature on indium
incorporation and obtain nearly-lattice-matched Al_{0.81}In_{0.19}N at a growth
temperature of 760^{o}C. We outline a procedure to check in-plane lattice
mismatch using high resolution x-ray diffraction, and evaluate the strain and
critical thickness. Polarization-resolved optical transmission measurements of
the Al_{0.81}In_{0.19}N epilayer reveal a difference in bandgap of ~140 meV
between (electric field) E_parallel_c [0001]-axis and E_perpendicular_c
conditions with room-temperature photoluminescence peaked at 3.38 eV strongly
polarized with E_parallel_c, in good agreement with strain-dependent
band-structure calculations
The effects of macroscopic inhomogeneities on the magneto transport properties of the electron gas in two dimensions
In experiments on electron transport the macroscopic inhomogeneities in the
sample play a fundamental role. In this paper and a subsequent one we introduce
and develop a general formalism that captures the principal features of sample
inhomogeneities (density gradients, contact misalignments) in the magneto
resistance data taken from low mobility heterostructures. We present detailed
assessments and experimental investigations of the different regimes of
physical interest, notably the regime of semiclassical transport at weak
magnetic fields, the plateau-plateau transitions as well as the
plateau-insulator transition that generally occurs at much stronger values of
the external field only.
It is shown that the semiclassical regime at weak fields plays an integral
role in the general understanding of the experiments on the quantum Hall
regime. The results of this paper clearly indicate that the plateau-plateau
transitions, unlike the the plateau-insulator transition, are fundamentally
affected by the presence of sample inhomogeneities. We propose a universal
scaling result for the magneto resistance parameters. This result facilitates,
amongst many other things, a detailed understanding of the difficulties
associated with the experimental methodology of H.P. Wei et.al in extracting
the quantum critical behavior of the electron gas from the transport
measurements conducted on the plateau-plateau transitions.Comment: 20 pages, 9 figure
Non-intrinsic superconductivity in InN epilayers: role of Indium Oxide
In recent years there have been reports of anomalous electrical resistivity
and the presence of superconductivity in semiconducting InN layers. By a
careful correlation of the temperature dependence of resistivity and magnetic
susceptibility with structural information from highresolution x-ray
diffraction measurements we show that superconductivity is not intrinsic to InN
and is seen only in samples that show traces of oxygen impurity. We hence
believe that InN is not intrinsically a superconducting semiconductor.Comment: pdf file with figure
The contra-rotating hydraulic turbine
EThOS - Electronic Theses Online ServiceGBUnited Kingdo