Navigation Links
Latest issue of Science: Nano-sonar uses electrons to measure under the surface
Date:2/27/2009

Jlich, 27 February 2009 Just as sonar sends out sound waves to explore the hidden depths of the ocean, electrons can be used by scanning tunnelling microscopes to investigate the well-hidden properties of the atomic lattice of metals. As researchers from Gttingen, Halle and Jlich now report in the high-impact journal "Science", they succeeded in making bulk Fermi surfaces visible in this manner. Fermi surfaces determine the most important properties of metals.

"Fermi surfaces give metals their personality, so to speak," explained Prof. Stefan Blgel, Director at the Jlich Institute of Solid State Research. Important properties, such as conductivity, heat capacity and magnetism, are determined by them. On the Fermi surfaces inside the atomic union, high-energy electrons are in motion. Depending on what form the surfaces have and what mobility is assigned to the electrons, they determine the physical properties of metals.

microscope."

In their latest publication, the researchers report on how they used a scanning tunnelling microscope to direct electrons into a copper sample. As electrons spread out like waves, they pass through the metal and are scattered and reflected at obstacles in the bulk, such as single cobalt atoms. "The overlap between incoming and outgoing waves is so strong," said Dr. Samir Lounis from Forschungszentrum Jlich who turned the theoretical calculations into an experiment, "that they can be measured as spherical patterns on the surface using the scanning tunnelling

The somewhat deformed rings on the surface allow us to draw direct conclusions on the shape of the Fermi surfaces and the depth of the cobalt atoms, similar to how sonar recognises the ocean floor by means of reflected sound waves. "We hope that more sophisticated methods will make it possible to gain a detailed understanding of deep impurities and interfaces between atomic lattices," explained Lounis. For his simulations of the scanning tunnelling experiment, he used the supercomputer known as JUMP in the Jlich Supercomputing Centre.

In a related article in the "Perspectives" section of "Science", the innovative approach is praised. A scanning tunnelling microscope is primarily used to characterise the surface of a sample. Thanks to the theoretical work in Jlich, it can now be used to gain a direct insight into the bulk of solids and to understand interesting effects in the nanoworld.


'/>"/>

Contact: Kosta Schinarakis
k.schinarakis@fz-juelich.de
0049-246-161-4771
Helmholtz Association of German Research Centres
Source:Eurekalert  

Related biology technology :

1. Jatropha Sector Reality Check: Still Viable In Volatile Times? Upcoming Webcast Shares Latest Insights
2. European Nephrologists Share Insights on the Management of Renal Anemia and Hyperphosphatemia in Latest BioTrends Report
3. MicroPhage Closes Latest Financing
4. Can Algae Biofuels Satisfy the World's Growing Biofuel Needs? Upcoming Webinar Shares the Latest Commercialization Strategies and Challenges
5. EUPROBIO 2008 Presentation to Highlight Latest Immune Research
6. Latest Sleep Disorder Technology Tested With SleepQuest
7. [video] Jacques Tizabi, CEO of Universal Detection Technology Discusses Latest Purchase Order on WallSt.nets 3-Minute Press Show
8. Rudd Report Highlights AMDL, Inc.s Latest Business Achievements; Supports 2008 Financial Guidance
9. Carbon nanotube measurements: latest in NIST how-to series
10. Parks Associates Digital Health Analyst to Present Latest Research and Forecasts at ATA Show
11. PacifiCare Capitulates to Latest Patient Revolt
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Latest issue of Science: Nano-sonar uses electrons to measure under the surface
(Date:12/2/2016)... NORWALK, Conn. , Dec. 2, 2016  The ... research presentations from the MMRF CoMMpass Study SM —the ... and accelerating precision medicine in multiple myeloma—will be presented ... (ASH) Annual Meeting & Exposition in San ... are helping to optimize treatment strategies, as well as ...
(Date:12/2/2016)... Research and Markets has announced the addition of ... to their offering. ... , , An ... is anticipated. Nanotechnology will be applied at all stages of ... applications in clinical trials. Many of the assays based on ...
(Date:12/2/2016)... ... December 01, 2016 , ... Aerocom ... North American hospitals, will present its chain-of-custody solution for tracking and securing medications ... Vegas, Nev., Dec. 4-8, 2016. , Aerocom has a proven solution for tracking ...
(Date:12/2/2016)... ... 2016 , ... DrugDev believes the only way to achieve real ... All three tenets were on display at the 2nd Annual DrugDev User Summit (hosted ... CRO and site organizations to discuss innovation and the future of clinical research. ...
Breaking Biology Technology:
(Date:11/14/2016)... , Nov. 14, 2016  Based on ... market, Frost & Sullivan recognizes FST Biometrics ... Award for Visionary Innovation Leadership. FST Biometrics ... biometric identification market by pioneering In Motion ... for instant, seamless, and non-invasive verification. This ...
(Date:6/22/2016)... 2016 On Monday, the Department of Homeland ... share solutions for the Biometric Exit Program. The Request ... Protection (CBP), explains that CBP intends to add biometrics ... the United States , in order to deter ... Logo - http://photos.prnewswire.com/prnh/20160622/382209LOGO ...
(Date:6/15/2016)... York , June 15, 2016 ... new market report titled "Gesture Recognition Market by Application ... Forecast, 2016 - 2024". According to the report, the  ... 11.60 billion in 2015 and is estimated to ... USD 48.56 billion by 2024.  Increasing ...
Breaking Biology News(10 mins):