The experiment is a much more practical version of a study Boehme and colleagues published in Science in 2010, when they were able to read nuclear spins from
phosphorus atoms in a conventional silicon semiconductor.
The single - atom transistor is made by carving a slot in a hydrogen - coated silicon wafer with a tunneling electron microscope and depositing a single
phosphorus atom in the hole.
Not exact matches
Silicon - 28 is not magnetic so the
atoms had almost no effect on the magnetic moment, or nuclear spin, of the
phosphorus, meaning that these
atoms behaved as though they were
in a vacuum.
And the progress goes on: Late last year, researchers
in Finland and Australia built an experimental transistor out of a single
atom of
phosphorus.
And
in this case, the scientists found that the
phosphorus had a little patch of negative charge, just enough to hook up with the hydrogen
atom.
The group's setup swaps out a silicon
atom for a
phosphorus one
in a silicon wafer, introducing an extra «donor» electron that can be manipulated and measured.
Phosphorus - doped silicon is a promising medium for spintronics because each phosphorus atom «donates» an extra electron that orbits rather freely and hence is open to manipulation in the silico
Phosphorus - doped silicon is a promising medium for spintronics because each
phosphorus atom «donates» an extra electron that orbits rather freely and hence is open to manipulation in the silico
phosphorus atom «donates» an extra electron that orbits rather freely and hence is open to manipulation
in the silicon crystal.
Like many spintronics researchers, University of Sydney physicist Dane McCamey and his colleagues targeted electrons of
phosphorus atoms trapped
in silicon.
Chemists at the Technische Universität München (TUM) have now developed a semiconducting material
in which individual
phosphorus atoms are replaced by arsenic.
A lone
atom of
phosphorus embedded
in a sheet of silicon has been made to act as a transistor.
The spin of the electrons
in isolated
phosphorus atoms could serve as qubits, the quantum equivalent of the bits
in today's computers.
The researchers were able to peer inside elements like
phosphorus and sulfur with incredibly high «time resolution,» exciting the electrons
in the deepest part of those
atoms.
«Our decade - long research program had already established the most long - lived quantum bit
in the solid state, by encoding quantum information
in the spin of a single
phosphorus atom inside a silicon chip, placed
in a static magnetic field.»
In addition, gold clusters with the phenyl - containing ligand fragmented through a wide range of dissociation channels involving the loss of gold
atoms as well as activation of the
phosphorus - carbon bonds of the ligands.
Methods: Diphenylphosphine ligands, which consist of two phenyl (C6H5) substituted
phosphorus centers separated by a carbon chain of variable length, produce gold clusters with extremely narrow distributions
in size; that is, the synthesis route produces a large quantity of clusters with the same number of gold
atoms as well as a small number of clusters with similar numbers of
atoms.