electrons: search

Electrons start hopping across nanowires

Using electrical resistance measurements, researchers at the University of Minnesota, US, have discovered that electrons travelling along a molecular nanowire stop tunnelling through the wire and start "hopping" across it when the wire reaches a length of about 4 nm. This effect had been predicted before but never observed until now. The result could help in designing future molecular electronics devices.

Nanowire quantum dot counts electrons

Scientists in Switzerland have succeeded in measuring current by counting single electrons tunnelling through an indium arsenide nanowire quantum dot. The results obtained compare well to current measurements made using conventional techniques; so opening the way for single-charge detection to define a new metrology standard for electric current.

Avalanche Effect Demonstrated In Solar Cells

esocid writes "Researchers at TU Delft (Netherlands) and the FOM (Foundation for Fundamental Research on Matter) have found irrefutable proof that the so-called avalanche effect by electrons occurs in specific semiconducting crystals of nanometer dimensions. This physical effect could pave the way for cheap, high-output solar cells. Solar cells currently have relatively low output, typically 15%, and high manufacturing costs. One possible improvement could derive from a new type of solar cell made of semiconducting nanocrystals and could theoretically lead to a maximum output of 44%, with the added benefit of reducing manufacturing costs. In conventional solar cells, one photon can release precisely one electron. However, in some semiconducting nanocrystals, one photon can release two or three electrons, hence the term 'avalanche effect.

Possible Solution to Solar Flare Damage to Satellites

When a solar flare blasts energetic particles and magnetic flux at Earth, our satellites are on the front line. As coronal mass ejections (CMEs) interact with the Earth's magnetosphere, there is a huge injection of energetic electrons into the Earth's radiation belts. This can have dire consequences for the satellites that we depend on for communications around the globe. All is not lost however. Scientists in Australia have stumbled upon a possible, innovative solution to discharge these troublesome electrons into the atmosphere: bathe the skies in radio waves.

High-flying electrons may provide new test of quantum theory

Researchers at the National Institute of Standards and Technology (NIST) and Max Planck Institute for Physics in Germany believe they can achieve a significant increase in the accuracy of one of the fundamental constants of nature by boosting an electron to an orbit as far as possible from the atomic nucleus that binds it.

IU Physicists to get their 'glue-on'

This machine accelerates a beam of electrons to an energy of 12 billion electron-volts before they pass through a diamond crystal which produces linearly polarized photons. These photons will strike a liquid hydrogen target and interact with the quar ...

Oregon Physicists Don't Flip Spin but Find Possible Electron Switch

University of Oregon researchers trying to flip the spin of electrons with laser bursts lasting picoseconds (a trillionth of a second) instead found a way to manipulate and control the spin -- knowledge that may prove useful in a variety of new materials and technologies.

Physicists Don't Flip Spin but Find Possible Electron Switch

University of Oregon researchers trying to flip the spin of electrons with laser bursts lasting picoseconds (a trillionth of a second) instead found a way to manipulate and control the spin -- knowledge that may prove useful in a variety of new materials and technologies.

Oregon Physicists Don't Flip Spin but Find Possible Electron Switch

University of Oregon researchers trying to flip the spin of electrons with laser bursts lasting picoseconds (a trillionth of a second) instead found a way to manipulate and control the spin -- knowledge that may prove useful in a variety of new materials and technologies.

Physicists don't flip spin but find possible electron switch

(Nanowerk News) University of Oregon researchers trying to flip the spin of electrons with laser bursts lasting picoseconds (a trillionth of a second) instead found a way to manipulate and control the spin -- knowledge that may prove useful in a variety of new materials and technologies.

Discovery by UC Riverside physicists could enable development of faster computers

Sketch of a ferromagnetsemiconductor structure. When the MgO interface is very thin spin up electrons represented in this image with an arrow to the right are reflected back to the semiconductor. At an intermediate thickness of the interface spin dow ...

Researchers demonstrate 'avalanche effect' in solar cells

Researchers at TU Delft and the FOM Foundation for Fundamental Research on Matter have found irrefutable proof that the so-called avalanche effect by electrons occurs in specific, very small semiconducting crystals. This physical effect could pave the way for cheap, high-output solar cells. The findings are to be published in scientific journal Nano Letters this week.

'Avalanche Effect' In Solar Cells Demonstrated

Researchers at TU Delft and the FOM Foundation for Fundamental Research on Matter have found irrefutable proof that the so-called avalanche effect by electrons occurs in specific, very small semiconducting crystals. This physical effect could pave the way for cheap, high-output solar cells. The findings are to be published in scientific journal Nano Letters.

Researchers demonstrate 'avalanche effect' in solar cells

Researchers at TU Delft (Netherlands) and the FOM Foundation for Fundamental Research on Matter have found irrefutable proof that the so-called avalanche effect by electrons occurs in specific, very small semiconducting crystals. This physical effect could pave the way for cheap, high-output solar cells. The findings are to be published in scientific journal Nano Letters this week.

Researchers demonstrate 'avalanche effect' in solar cells

Researchers at TU Delft [profile] (Netherlands) and the FOM Foundation for Fundamental Research on Matter have found irrefutable proof that the so-called avalanche effect by electrons occurs in specific, very small semiconducting crystals. This physical effect could pave the way for cheap, high-output solar cells. The findings are to be published in scientific journal Nano Letters this week.

Researchers demonstrate 'avalanche effect' in solar cells

(Nanowerk News) Researchers at TU Delft and the FOM Foundation for Fundamental Research on Matter have found irrefutable proof that the so-called avalanche effect by electrons occurs in specific, very small semiconducting crystals. This physical effect could pave the way for cheap, high-output solar cells. The findings are to be published in scientific journal Nano Letters this week.

DAFNE enjoys a particle boost

Scientists at the Italian particle accelerator DAFNE are looking forward to an era of new physics having implemented an upgrade that is boosting the rate at which the machine can collide electrons and positrons. Their success paves the way for a new accelerator that is over 10 times as big with 10 times more energy.

Hairy Solar Cells Could Mean Higher Efficiency

kitzilla writes "Two research groups working independently have come up with what they say are cheap processes for growing nanowires to be used with solar cells. The 'hairy' cells provide a direct path for electrons collected at the panel face to reach an electrode, something which has the potential to dramatically improve system efficiency."

Nanostructures raise solar cell efficiency

Researchers are working to develop new devices that could lead to big gains in thin-film solar cell efficiency by increasing both the number of photons thin-film solar cells absorb and the number of excited electrons the same devices collect.

Could Quantum Tunneling Be Measured By The Attosecond? New Research Leads The Way

In a recent paper the experimental physicist Ursula Keller described how circularly polarized light can be used to measure events in the attosecond range. A measurement of this kind could perhaps soon give an experimental answer to the question of whether a measurable tunnelling time of electrons as a result of the tunnelling effect really exists – one of the big unsolved riddles of physics.

Diamonds Key To Quantum Computing

I Don't Believe in Imaginary Property writes "Scientists P. Neumann, N. Mizuochi & co. have advanced quantum computing by finding a new method to get two-way and three-way, high quality quantum correlations that persist for hundreds or thousands of microseconds, even at room temperature. Their paper (subscription required) describes how they manipulated electrons from nitrogen vacancies in diamond using microwaves to entangle adjacent carbon-13 nuclei. Even better, this builds on previous results which indicate that diamonds with nitrogen impurities may be the key to creating useful quantum computing devices. The article provides a good description of what nitrogen vacancies are and why they prove useful."

Famous supernovae still echo across the Milky Way

In 1572, the Danish astronomer Tycho Brahe observed and studied the explosion of a star that became known as Tycho's supernova. More than four centuries later, Chandra's X-ray photograph of the supernova remnant shows an expanding bubble of multimillion degree debris (green and red) inside a more rapidly moving shell of extremely high energy electrons (filamentary blue). Astronomers have detected a light echo from this supernova, meaning they can see the light from the explosion itself 400 years later. NASA/CXC/Rutgers/J.Warren & J.Hughes et al. [View Larger Image]

Electrometers for nanotechnology

(Nanowerk Spotlight) Electrometers are instruments that measure electric charge or electrical potential difference by means of electrostatic force. While early electrometers such as developed by Lord Kelvin in the 19th century were crude instruments, modern electrometers based on solid state technology are high-precision electronic devices that, in extreme cases, are so sensitive they can count individual electrons as they pass through a circuit.

Eric Lerner's Focus Fusion Device Gets Funded

pln2bz writes "Eric Lerner, author of The Big Bang Never Happened, has received $600k in funding, and a promise of phased payments of $10 million if scientific feasibility can be demonstrated to productize Lerner's focus fusion energy production device. Unlike the Tokamak, focus fusion does not require the plasma to be stable, does not produce significant amounts of dangerous radiation, directly injects electrons into the power grid without the need for turbines and would only cost around $300k to manufacture a generator. Lerner's inspiration for the technology is based upon an interpretation for astrophysical Herbig-Haro jets that agrees with the Electric Universe explanation."

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