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A high-conductivity two-dimensional (2D) hole gas, analogous to the ubiquitous 2D electron gas, is desirable in nitride semiconductors for wide-bandgap p-channel transistors. We report the observation of a polarization-induced high-density 2D hole gas in epitaxially grown gallium nitride on aluminium nitride and show that such hole gases can form without acceptor dopants. The measured high 2D hole gas densities of about 5 × 10 per square centimeters remain unchanged down to cryogenic temperatures and allow some of the lowest p-type sheet resistances among all wide-bandgap semiconductors. The observed results provide a probe for studying the valence band structure and transport properties of wide-bandgap nitride interfaces.
This article was published in the following journal.
Name: Science (New York, N.Y.)
Colloidal quantum wells are two-dimensional materials grown with atomically-precise thickness that dictates their electronic structure. Although intersubband absorption in epitaxial quantum wells is w...
The surface charge of gallium nitride (GaN) in contact with solution is controlled by pH via surface protonation and deprotonation, similar to silica. Ionic surfactants adsorb on surfaces via electros...
Next-generation passive optical networks require integrated, polarization-insensitive wavelength-division multiplexing solutions, for which the recently emerging low-loss silicon nitride nanophotonic ...
In this paper, the possible interactions between 5-fluorouracil (5FU) as an anticancer drug and gallium nitride (GaN) nanocage (NC) in aqueous solution have been investigated using DFT/CPCM/B3LYP-D/6-...
We study the effect of the coupling between the hole s shell of one quantum dot and the p shell in the other dot forming a vertically stacked self-assembled quantum dot molecule on the spin r...
This phase II trial studies how well gallium Ga 68 DOTA-NeoBOMB1 and gallium Ga 68 PSMA-R2 positron emission tomography (PET)/magnetic resonance imaging (MRI) work in diagnosing participan...
A study to assess the utility of human polarization pattern perception for the detection, diagnosis and monitoring of eye disease
The objetive of the study is to evaluate the effect of personalized quantum sonotherapy on the level of anxiety and pain in outpatients schedule for orthopedic surgery under regional anest...
Background: - Direct current (DC) brain polarization is a technique in which very weak electricity is applied to the head. Doctors have used DC polarization for many years on pati...
Eligible patients will have low- or intermediate-grade Non-Hodgkin's Lymphoma (NHL) that has progressed after standard chemotherapy. Patients will receive gallium nitrate 300 mg/m2/day by...
Stable gallium atoms that have the same atomic number as the element gallium, but differ in atomic weight. Ga-71 is a stable gallium isotope.
Unstable isotopes of gallium that decay or disintegrate emitting radiation. Ga atoms with atomic weights 63-68, 70 and 72-76 are radioactive gallium isotopes.
Nanometer sized fragments (the dots) of semiconductor crystalline material which emit PHOTONS. The wavelength is based on the quantum confinement size of the dot. They are brighter and more persistent than organic chemical INDICATORS. They can be embedded in MICROBEADS for high throughput ANALYTICAL CHEMISTRY.
Measurement of the polarization of fluorescent light from solutions or microscopic specimens. It is used to provide information concerning molecular size, shape, and conformation, molecular anisotropy, electronic energy transfer, molecular interaction, including dye and coenzyme binding, and the antigen-antibody reaction.
Fluoroimmunoassay where detection of the hapten-antibody reaction is based on measurement of the increased polarization of fluorescence-labeled hapten when it is combined with antibody. The assay is very useful for the measurement of small haptenic antigens such as drugs at low concentrations.