Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Electrical Transmission at the Atomic Level

01.04.2014

Heidelberg physicists develop new approach to building signal processing components from individual atoms

In a study on the transport of atoms in ultracold gases, a team of physicists led by Dr. Sandro Wimberger has developed a new approach to how signals might be transmitted at the atomic level.

This could be especially important for realising logic structures with strictly defined functions on the basis of individual atoms, which in turn could find application in transistors or diodes. The research work in the innovative field of atomtronics is being done at the Institute for Theoretical Physics at Heidelberg University.

The researchers are attempting to gain a fundamental understanding of quantum mechanical effects as compared to conventional electronics.

New experimental techniques allow targeted control of ultracold atomic gases – and ergo the bottom-up creation and study of logical components. Dr. Wimberger’s working group is studying the transport of individual atoms through a chain of so-called potential wells. “At an entirely different order of magnitude, imagine an empty egg carton in which the eggs ‘wander’ from one dimple to the next across the entire carton,” explains the Heidelberg physicist.

In these experiments, the atoms behave coherently, meaning they follow the same fixed rule during dynamic transport. In this instance, their behaviour is completely quantum mechanical over the entire chain of potential wells. Dr. Wimberger adds that at the same time, however, different atoms interact with one another, which can affect transport from one well to the next.

The principle is similar to the flow of electrons in a solid state body to which electrical voltage is applied. In this case, the Heidelberg scientists are working with bosonic atoms from a large particle reservoir coupled to a lattice of potential wells. Via the lattice chain, individual bosons flow from the larger into a smaller particle reservoir, generating a particle current in the process.

“The atomic current depends on the properties of the particle reservoir, but especially on the interactions between the atoms,” states Anton Ivanov, the study’s lead author and formerly a member of Dr. Wimberger’s working group. If the interaction is weak, the atomic current flow is directly proportional to the difference in the number of particles between the two reservoirs.

Therefore, it increases linearly with the difference in the number of particles – which is analogous to the voltage in an electrical circuit. If their interaction is strong, the atoms intersperse and block the flow of electricity until it comes to a complete halt.

In their study, the Heidelberg researchers used an analytic approach that was largely confirmed through numerical calculations. The results of their research were published in the “European Physical Journal”.

Original publication:
A. Ivanov, G. Kordas, A. Komnik, S. Wimberger: Bosonic transport through a chain of quantum dots, European Physical Journal B (5 August 2013), doi: 10.1140/epjb/e2013-40417-4

Contact:
Dr. Sandro Wimberger
Institute for Theoretical Physics
phone: +49 6221 54-5038
s.wimberger@itp.uni-heidelberg.de

Communications and Marketing
Press Office
phone: +49 6221 542311
presse@rektorat.uni-heidelberg.de

Marietta Fuhrmann-Koch | idw - Informationsdienst Wissenschaft
Further information:
http://www.uni-heidelberg.de

Further reports about: Atomic Contact Electrical Physical Transmission conventional diodes gases lattice voltage

More articles from Studies and Analyses:

nachricht Diagnoses: When Are Several Opinions Better Than One?
19.07.2016 | Max-Planck-Institut für Bildungsforschung

nachricht High in calories and low in nutrients when adolescents share pictures of food online
07.04.2016 | University of Gothenburg

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

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

Im Focus: Self-assembling nano inks form conductive and transparent grids during imprint

Transparent electronics devices are present in today’s thin film displays, solar cells, and touchscreens. The future will bring flexible versions of such devices. Their production requires printable materials that are transparent and remain highly conductive even when deformed. Researchers at INM – Leibniz Institute for New Materials have combined a new self-assembling nano ink with an imprint process to create flexible conductive grids with a resolution below one micrometer.

To print the grids, an ink of gold nanowires is applied to a substrate. A structured stamp is pressed on the substrate and forces the ink into a pattern. “The...

Im Focus: The Glowing Brain

A new Fraunhofer MEVIS method conveys medical interrelationships quickly and intuitively with innovative visualization technology

On the monitor, a brain spins slowly and can be examined from every angle. Suddenly, some sections start glowing, first on the side and then the entire back of...

Im Focus: Newly discovered material property may lead to high temp superconductivity

Researchers at the U.S. Department of Energy's (DOE) Ames Laboratory have discovered an unusual property of purple bronze that may point to new ways to achieve high temperature superconductivity.

While studying purple bronze, a molybdenum oxide, researchers discovered an unconventional charge density wave on its surface.

Im Focus: Mapping electromagnetic waveforms

Munich Physicists have developed a novel electron microscope that can visualize electromagnetic fields oscillating at frequencies of billions of cycles per second.

Temporally varying electromagnetic fields are the driving force behind the whole of electronics. Their polarities can change at mind-bogglingly fast rates, and...

Im Focus: Continental tug-of-war - until the rope snaps

Breakup of continents with two speed: Continents initially stretch very slowly along the future splitting zone, but then move apart very quickly before the onset of rupture. The final speed can be up to 20 times faster than in the first, slow extension phase.phases

Present-day continents were shaped hundreds of millions of years ago as the supercontinent Pangaea broke apart. Derived from Pangaea’s main fragments Gondwana...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

GROWING IN CITIES - Interdisciplinary Perspectives on Urban Gardening

15.07.2016 | Event News

SIGGRAPH2016 Computer Graphics Interactive Techniques, 24-28 July, Anaheim, California

15.07.2016 | Event News

Partner countries of FAIR accelerator meet in Darmstadt and approve developments

11.07.2016 | Event News

 
Latest News

World first demo of labyrinth magnetic-domain-optical Q-switched laser

28.07.2016 | Information Technology

New material could advance superconductivity

28.07.2016 | Materials Sciences

CO2 can be stored underground for 10 times the length needed to avoid climatic impact

28.07.2016 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>