
	Where results make sense

Topic: Quantum wire

Related Topics

Nanowire

In the News (Wed 30 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	whatarequantumdots
		Quantum dots are so small that when there is even a change in the addition or subtraction of an electron the molecule is changed in a useful way (10).
		Quantum dots are thought to be built from the bottom up, meaning that there size is determined by the number of atoms or ions that are used in building the quantum dot.
		Quantum dots are said to be tunable, because of this bottom up building feature and are thus manipulated for many uses in a wide variety of applications.
	www.sas.upenn.edu /~ryantw/Subpages-507/whatarequantumdots.html (286 words)

	Quantum dot - Wikipedia, the free encyclopedia
		A quantum dot is a semiconductor nanostructure that confines the motion of conduction band electrons, valence band holes, or excitons (pairs of conduction band electrons and valence band holes) in all three spatial directions.
		Quantum dots can be contrasted to other semiconductor nanostructures: 1) quantum wires, which confine the motion of electrons or holes in two spatial directions and allow free propagation in the third.
		To this end, quantum dots have quickly filled in the role, being found to be superior to traditional organic dyes on several counts, one of the most immediately obvious being brightness (owing to the high quantum yield) as well as their stability (much less photodestruction).
	en.wikipedia.org /wiki/Quantum_dot (2158 words)

	Wired 9.10: Ultimate Alchemy
		Quantum wires can also be used as precision waveguides, and of course as actual wires.
		Quantum dots can serve as really, really small transistors, whose logic is many times more efficient than that of today's transistors and operates on single electrons.
		Now, the spacing of the quantum dots on our chip is problematic, since they need to be close enough to interact, but not so close that the electrodes of one will have a major disruptive effect on the contents of its neighbors.
	www.wired.com /wired/archive/9.10/atoms_pr.html (6586 words)

	A Quantum Leap For Computers?
		Quantum logic, says Shor, makes it possible to sort through a space of solutions that grows exponentially with the size of the number to be factored.
		Quantum computers, with their potential for cracking codes based on the factors of large numbers, could threaten the peace of mind of spies, diplomats, and others bent on secret communications (see main text).
		Because of quantum mechanical uncertainty, she won't be able to reconstruct the exact sequence of pulses she intercepted.
	www.ecst.csuchico.edu /~atman/Crypto/quantum/qc-leap.html (2000 words)

	Quantum structures
		Here j is the quantum number labeling the levels, and d is the thickness of the quantum well (the thickness of the layer shown in Fig.1a in the y direction).
		Let us now consider a one-dimensional quantum wire where electron motion in two directions (y and z) is quantized and in one direction (x) electrons are free to move (see Fig.1b).
		are quantum numbers related to quantization in the y and z directions, dy and dz are dimensions of the quantum wire in the y and z directions, and where we assume that the dispersion relation for the electron energy in each subband is parabolic.
	www.mtmi.vu.lt /pfk/funkc_dariniai/nanostructures/quant_structures.htm (1295 words)

	Physics News Update Number 177 - A QUANTUM WIRE MICROCAVITY LASER (Site not responding. Last check: 2007-10-14)
		First, the active laser medium consists of arrays of quantum wires, practically one-dimensional semiconductor structures in which electron energies are greatly restricted to narrow bands.
		Secondly, the photons emitted by the quantum wires resonate in a microcavity (a "quantum dot" for photons) which allows only a single light mode to operate.
		The wires emit light in all directions, but inside the microcavity (itself formed of semiconductor layers) they are forced to emit light in the direction of the end faces.
	www.aip.org /pnu/1994/split/pnu177-1.htm (231 words)

	A "Hole" New Quantum Spin
		Known as a hole quantum wire, it exploits gaps -- or holes -- between electrons.
		Quantum wires are microscopically small, in this case about 100 times narrower than a human hair.
		Quantum wires made it possible to isolate and exercise some control over single electrons.
	www.hpcwire.com /hpc/748783.html (606 words)

	CAMMP - Center for Advanced Microgravity Processing
		These are called the quantum confinement effects and can be 0-dimensional (quantum dots), 2-dimensional (quantum wells), or 1-dimensional (quantum wires).
		The energy quantization effects of quantum wires are prominent; however, quantum wire fabrication has considerable technical complexity and cost.
		With this novel methodology it is possible to tailor the ETS-4 crystals with desired properties for utilization as quantum wire components (Figure 1d).
	www.dac.neu.edu /cammp/quantum-wires.htm (341 words)

	Quantum devices (Site not responding. Last check: 2007-10-14)
		Quantum effects due to 2-dimensional or 1-dimensional carrier confinement have been observed.
		The thickness of the GAA devices is either 40 or 80 nm, and the section of the quantum wires is 100 x 85 nm.
		This is the current as a function of gate voltage (at different temperatures) measured in the quantum wire.
	www.dice.ucl.ac.be /soi/activities/quantum.html (383 words)

	UNSW School of Physics Annual Report 2003
		Research at UNSW is focussed on electronic silicon-based solid state quantum computing in which the quantum bits (qubits) are comprised of single phosphorus atoms embedded in silicon, with quantum information encoded onto the spin or charge state of the atoms.
		Low temperature magnetoresistance studies of a 4 × 4 µm square and a 90 nm-wide quantum wire showed clear differences between the electrical properties of these two devices, revealing a beautiful demonstration of the cross-over from two-dimensional to one-dimensional electron transport in a quantum wire as the temperature is reduced.
		In 2003 we constructed and demonstrated a novel double quantum dot structure in silicon using phosphorus ion implantation, a critical test device to assess the potential of Si:P qubits (Figure 2a).
	www.phys.unsw.edu.au /ANNUAL_REPORTS/2003/research1.html (801 words)

	Bird Group Research
		Recent examples of this work include studies of transport in open quantum dots and quantum-dot arrays as tools for the investigation of quantum chaos and decoherence, investigations of spontaneous spin polarization in quantum wires, and studies of time-resolved transient transport in semiconductor nanostructures.
		Recently, for example, we have been exploring: a possible spontaneous spin polarization of electrons in semiconductor nannies that is driven by many-body effects; the use of quantum dots and quantum-dot arrays as probes of quantum chaos and decoherence, and; the transient conductance of semiconductor nanostructures.
		In numerical simulations of the quantum transport of this system, it has been predicted that the properties (size and local barrier) of this region may be tuned to switch electrons coherently between the wires.
	www.eng.buffalo.edu /~jbird/research.html (2302 words)

	Quantum wire - Wikipedia, the free encyclopedia
		Instead an exact calculation of the transverse energies of the confined electrons has to be performed to calculate the wire resistance.
		For metals, quantization corresponding to the lowest energy states is only observed for atomic wires.
		It would be made with carbon nanotubes and would help reduce the weight of the next generation shuttle; but can also have wide ranging applications.
	en.wikipedia.org /wiki/Quantum_wire (471 words)

	Transport Spectroscopy of a Quantum Wire (Site not responding. Last check: 2007-10-14)
		Using cleaved edge overgrowth in MBE we have fabricated quantum wires with a measured transport mean free path exceeding 10 \mu m.
		The electrons in the wire are confined by a 25 nm rectangular potential in one direction and by a triangular potential with similar typical dimensions in the other direction resulting in a 1D subband separation of several meV.
		Upon varying the density in the wire (using the gate electrodes) we observe strong quantization of the conductance corresponding to the depletion of the wire subbands.
	flux.aps.org /meetings/BAPSMAR96/abs/S460009.html (154 words)

	Electron 'hole' wire breaks new ground in quantum electronics \| COSMOS magazine
		Known as the 'hole quantum wire', it is about 100 times narrower than a human hair, and is unique in that it does not use electrons to carry an electrical current.
		They exhibit remarkable quantum properties and if utilised may lead to a new world of super-fast, low-powered transistors and powerful quantum computers.
		And quantum wires developed to date, though so narrow that electrons must pass along them in single file, have only made it possible to exercise limited control over an electron's spin.
	www.cosmosmagazine.com /node/509 (471 words)

	q2d
		Eli Kapon at the Institute of Quantum Electronics and Photonics, Swiss Federal Institute of Technology in Lausanne (EPFL) we are investigating a number of novel V-groove quantum wire (QWR) devices.
		This high quantum efficiency was achieved with the aid of the self-formed vertical QWs in the AlGaAs barrier, in combination with thin GaAs spacer layers.
		Lasing at the lowest optical transition of the quantum wires was achieved when the laser structure was optically pumped under cw operation.
	www.ifm.liu.se /matephys/nanopto/QWires.html (1338 words)

	Wired News: NASA Funds 'Miracle Polymer'
		The cable, also known as a quantum wire, would theoretically conduct electricity up to 10 times better than traditional copper wire and weigh one-sixth as much.
		Under the agreement with NASA, Rice's Carbon Nanotechnology Laboratory is to produce a 1-meter-long prototype of quantum wire by 2010.
		Currently only 2 percent of all nanotubes can be used as quantum wires, and sorting these -- called "armchair nanotubes" -- from the rest is nearly impossible, according to Richard Smalley, director of the Carbon Nanotechnology Laboratory.
	www.wired.com /news/space/0,2697,67350,00.html (744 words)

	Quantum Bins and Storage Systems
		We carry the complete Quantum Storage Products line, with a wide range of styles, sizes and capacities available for purchase online 24 hours a day.
		Heavy Duty wire shelving resists corrosion, prevents the build up of dust and dirt, and improves the visibility of stored parts, and allows for sprinkler penetration.
		Here's the answer for wire shelving with a 1-1/4" to 1 1/2" face.
	www.quantum-bins.com /Q-P33.HTM (289 words)

	Recent Progress in Quantum Wire and Quantum Dot Work at Sheffield.
		In both the quantum wire and quantum dot cases, progress so far has been very good with high quality structures now available for physics research purposes, with device structures expected to be available in the near future for CF users both at Sheffield and elsewhere.
		An important feature of both the wire and dot work is that structures of quantum dimensions are produced with high quantum efficiency, by the use of growth related techniques without the involvement of small scale lithographic etching.
		Recent successes include the production of modulation-doped quantum wires, with strongly enhanced PL emission intensity relative to that of the sidewall quantum wells, and the growth of p-i-n structures.
	www.shef.ac.uk /eee/nc35t/newsletter/old/qwire-3.html (536 words)

	Hole Quantum Wire \| Technology News Daily (Site not responding. Last check: 2007-10-14)
		Known as a hole quantum wire, it exploits the gaps – or holes - between electrons: unlike in a conventional electrical wire, the current flows in the absence of electrons.
		Associate Professor Alex Hamilton and Dr Adam Micolich, who lead the UNSW Quantum Electronic Devices group say the discovery that the holes can carry an electrical current puts the team at the front of its field in the quantum electronics revolution.
		As the holes pass along the wire, they line up like soldiers marching in single file and our experiments show that their magnetic dipoles (their little bar magnets) all want to point along the wire.
	www.technologynewsdaily.com /node/3912 (503 words)

	ScienceDaily: Plenty Of Nothing: A Hole New Quantum Spin
		Quantum Computer Could Solve Problems In A Few Months That Would Take Conventional Computers Millions Of Years (September 13, 2001) -- How to build a super fast computer that uses the bizarre properties of quantum physics is the aim of a project by computer scientists Fred Chong of the University of California, Davis, Isaac Chuang...
		Quantum Behavior In A Classical World (September 19, 2006) -- Physicists in France have demonstrated wave/particle duality with a droplet made of trillions of...
		Quantum dot -- A quantum dot, also called a semiconductor nanocrystal, is a semiconductor crystal whose size is on the order of just a few nanometers.
	www.sciencedaily.com /releases/2006/07/060726091431.htm (1902 words)

	Determination of carrier-transfer length from side-wall quantum well to quantum wire by micro-photoluminescence ...
		Micro-photoluminescence ([mu]-PL) line scanning across a single V-groove, GaAs/AlGaAs quantum wire (QWR) has been performed at room temperature, revealing a clear spatial-dependence of the PL. After fitting each PL spectrum by multi-Gaussian line shapes, intensity profiles of each PL component from confined structures have been obtained as functions of the scanning position.
		The PL quenching of a side-wall quantum well (SQWL) has been recognized in a certain area in the vicinity of the QWR and is interpreted by carrier transfer into the QWR within effective transfer length.
		In comparing bulk and two-dimensional semiconductors, one-dimensional quantum wire (QWR) (one dimension is extended and the other two dimensions are confined) has an energy density of states consisting of discrete peaks at sublevel energies.
	www.findarticles.com /p/articles/mi_qa3776/is_200308/ai_n9244572 (736 words)

	Electroluminescent, eL wire, light Up Wire, light Up bracelets, light Up watches
		Light Up Wire is your source for the latest in light up toys, novelties and electroluminescent wire.
		Electroluminescent Wire is cable wire that illuminates with AC current that is frequency dependent.
		Electroluminescent Wire is also called Light Up Wire, EL wire, el-wire, Glow wire, light wire, lite wire, light, lights, Light up, coolwire, elcheap, coolight, livewire, neon light up wire, neon rope lights, fluorescent light stick up and coolneon.
	www.lightupwire.com (684 words)

	Goldhaber-Gordon Group \| Department of Physics \| Stanford University
		Nanofabrication techniques allow researchers to confine electrons in semiconductors to "mesoscopic" structures such as a 2-dimensional "quantum well", a 1D "quantum wire", or a 0D "quantum dot", which we like to call an "artificial atom".
		The mesoscopic scale is ten nanometers to ten microns at low temperatures: the length scale on which quantum mechanics holds sway, yet tens to thousands of mobile electrons are involved.
		The Goldhaber-Gordon group studies simple, archetypical structures such as a quantum point contact -- a narrow constriction between two electron reservoirs, which can be thought of as a short 1-dimensional wire.
	www.stanford.edu /group/GGG (255 words)

	Plenty of nothing: A hole new quantum spin
		Known as a hole quantum wire, it exploits gaps – or holes - between electrons.
		But the UNSW team - working with researchers in Britain, Japan and New Zealand - has gone a step further to develop super-clean gallium arsenide quantum wires that use holes, instead of electrons, to carry the current.
		Not confining the substance used for wiring could lead to malicious hacking into sensitive systems, via the capabilities of sugars great in situ, or finitely, in transit.
	www.physorg.com /news73128103.html (856 words)

	Mapping of Interfacial Strain Field in InGaAs/GaAs Quantum Wire Structures by Coherent Grating X-ray Diffraction (Site not responding. Last check: 2007-10-14)
		Constructive interference among the wires or the dots within the coherence width of an x-ray beam produces diffraction satellite peaks around each crystal Bragg reflection.
		In addition, the coherent interference within the individual wire or dot gives rise to distinct satellite peak intensity modulations in reciprocal space that are determined by the spatial distribution of the interfacial strain field.
		This result strongly suggests that the strain is the principle cause for the extra blue shifts in the photoluminescence spectra of the quantum wires.
	flux.aps.org /meetings/BAPSMAR96/abs/S805081.html (268 words)

	In Plane Gate Quantum Wire Transistors (Site not responding. Last check: 2007-10-14)
		In-plane gated (IPG) quantum wire transistors were fabricated using dry etching in a Cl2/Ar plasma generated with an electron cyclotron resonance source.
		VDS characteristics of in plane gated quantum wire transistors with Wc=440 nm and Wg=400 nm.
		Reduction of the gate leakage current for dry etched in plane gated quantum wire ttransistors after being passivated with low energy chlorine species for different time.
	www.eecs.umich.edu /~pang/projects/kk-IPG.html (1402 words)

Try your search on: Qwika (all wikis)