Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

One of the fastest phenomenon of electronic dynamics

21.07.2005


The journal Nature publishes this week a study of electronic dynamics (“Direct observation of electron dynamics in the attosecond domain”). The participants of this study, together with other researchers, have been professors Daniel Sánchez-Portal and Pedro Miguel Etxenike from the Donostia International Physics Center (DIPC).



A researcher group of various German laboratories has done the experimental part of the study, and the theoretical explanation based on quantum physics of what has been observed has been done in DIPC (San Sebastian).

This work answers the following question: How long does it take an electron to travel from an atom to the next atom? The main conclusion is that the time required is much shorter than the time it could be measured until now. This study analyses the dynamics of electrons in the case of sulphur atoms laid on metal surfaces (ruthenium). Electrons jump from the sulphur to the metallic surface in 320 attoseconds approximately (1 attosecond is equivalent to 0,000000000000000001 seconds). In order to have an idea how small this number is, we could say that one attosecond at one second would be what a second would be at the age of the universe (about 14,000 millions of years).


The main innovation of this work consists on the possibility to measure a charge transference time between an atom and a surface at attoseconds, and at the same time, two theory physicists of the University of the Basque Country (EHU) have worked out details of the process by means of quantum mechanics. This phenomenon is one of the fastest ever seen directly in the solid state physics, and it shows it is possible to obtain information about the dynamics of electrons with great resolution. In order to achieve such resolution it is necessary to use a precise measurement "device", in this case, a clock that provides electronic transitions within the same atom.

The question about the time electrons require to travel between different atomic centres is very important for several phenomena. It is important to optimise the design of materials that will constitute future electronic devices (areas of nanoelectronic and molecular electronic). Particularly, the technique used allows to distinguish among different values of the electronic “spin” (giromagnetic ratio), and this opens new areas of study in the field of “spintronic”, a new electronics in which the key factor is not the electron charge as in the conventional electronics, but the spin. Charge transference processes are also essential for life (photosynthesis), energy production (photovoltaic cells) and, in general, for the photochemistry and electrochemistry.

Irati Kortabitarte | alfa
Further information:
http://www.basqueresearch.com
http://www.elhuyar.com

More articles from Physics and Astronomy:

nachricht Study offers new theoretical approach to describing non-equilibrium phase transitions
27.04.2017 | DOE/Argonne National Laboratory

nachricht SwRI-led team discovers lull in Mars' giant impact history
26.04.2017 | Southwest Research Institute

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Fighting drug resistant tuberculosis – InfectoGnostics meets MYCO-NET² partners in Peru

28.04.2017 | Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

 
Latest News

Wireless power can drive tiny electronic devices in the GI tract

28.04.2017 | Medical Engineering

Ice cave in Transylvania yields window into region's past

28.04.2017 | Earth Sciences

Nose2Brain – Better Therapy for Multiple Sclerosis

28.04.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>