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:5/26/2016)... ... May 26, 2016 , ... ... announced several positive developments that position the Company for the future. Kinder ... transaction, Craig F. Kinghorn has been appointed Chairman of the Board, Curtis D. ...
(Date:5/25/2016)... ... May 25, 2016 , ... ... of fracture-specific plating options designed to address fractures of the distal tibia and ... , The Acumed Ankle Plating System 3 is composed of seven plate families ...
(Date:5/25/2016)... ... May 25, 2016 , ... WEDI, the nation’s leading authority on the ... Charles W. Stellar has been named by the WEDI Board of Directors as WEDI’s ... an executive leader with more than 35 years of experience in healthcare, association management ...
(Date:5/24/2016)... May 24, 2016   MedyMatch Technology Ltd ., the ... intelligence, real-time decision support tools in the emergency room, announced ... 2016 Israeli Advanced Technology Industries (IATI) BioMed Conference. ... 15th National Life Sciences and Technology Week, and ... Intercontinental Hotel in Tel Aviv, Israel . ...
Breaking Biology Technology:
(Date:4/13/2016)... , April 13, 2016  IMPOWER physicians supporting Medicaid ... setting a new clinical standard in telehealth thanks to ... leveraging the higi platform, IMPOWER patients can routinely track ... and body mass index, and, when they opt in, ... convenient visit to a local retail location at no ...
(Date:3/22/2016)... PUNE, India , March 22, 2016 ... new market research report "Electronic Sensors Market for ... Fingerprint, Proximity, & Others), Application (Communication & ... and Geography - Global Forecast to 2022", ... consumer industry is expected to reach USD ...
(Date:3/15/2016)... , March 15, 2016 --> ... published by Transparency Market Research "Digital Door Lock Systems Market ... 2015 - 2023," the global digital door lock systems market ... in 2014 and is forecast to grow at a CAGR ... micro, small and medium enterprises (MSMEs) across the world and ...
Breaking Biology News(10 mins):