Navigation Links
A new class of electron interactions in quantum systems
Date:1/23/2012

Physicists at the University of New South Wales have observed a new kind of interaction that can arise between electrons in a single-atom silicon transistor.

The findings, to be published this week in the journal Physical Review Letters, offer a more complete understanding of the mechanisms for electron transport in nanostructures at the atomic level.

"We have been able to study some of the most complicated transport mechanisms that can arise up to the single atom level," says lead author Dr Giuseppe C. Tettamanzi, from the School of Physics at UNSW.

The results contained in this study open the door for new quantum electronic schemes inwhich it is the orbital nature of the electrons and not their spin or their charge that plays a major role, he says.

The study, in collaboration with scientists from the ICMM in Madrid and the Kavli Institute in The Netherlands, describes how a single electron bound to a dopant atom in a silicon matrix can interact with many electrons throughout the transistor.

In these geometries, electron-electron interactions can be dominated by something called the Kondo effect. Conventionally, this arises from the spin degree of freedom, which represents an angular momentum intrinsic to each electron and is always in the up or in the down state.

However, researchers also observed that similar interactions could arise through the orbital degree of freedom of the electron. This describes the wave-like function of an electron and can be used to help determine an electrons' probable location around the atom's nucleus.

Importantly, by applying a strong magnetic field, the researchers were able to tune thiseffect to eliminate the spin-spin interactions while preserving the orbital-orbital interactions.

"By tuning the effect in two different symmetries of the fundamental state of the systemwe have observed a symmetry crossover identical to those seen in high-energy physics," says Tettamanzi.

"In our case this crossover was observed simply by using a semiconductor device which is not too different from the transistor you use daily to send your emails."

Tettamanzi, who was recently awarded a prestigious ARC Discovery Early Career Researcher Award fellowship, will now investigate another transport mechanism that can arise in quantum dots and single atom transistors called "quantised charge pumping".

The idea here is to create a current flowing through a nanostructure without applying a voltage between the leads, but by applying varying potentials at one or more gates of the transistor, in an apparent violation of Ohm's law.


'/>"/>

Contact: Giuseppe Tettamanzi
g.tettamanzi@unsw.edu.au
61-040-542-1886
University of New South Wales
Source:Eurekalert

Related biology technology :

1. LoneStar Heart Acquires Worldwide Exclusive Rights to New Class of Small Molecules That May Lead to New Treatments for Diabetes
2. Omeros Announces it has Unlocked 30 Percent of Class A Orphan GPCRs
3. Veracyte Announces Medicare Coverage for Its Afirma® Gene Expression Classifier for Improved Thyroid Nodule Diagnosis
4. StemCyte Adds World Class Talent to its North America and Global Operations
5. Omeros Announces It Has Unlocked Over 20 Percent of Class A Orphan GPCRs
6. Dual-acting class of antimalarial compounds discovered with potential to prevent and treat malaria
7. New Class of Stem Cell-Like Cells Discovered in Spinal Cord Offers Possibilities for Spinal Cord Repair
8. New Data Suggest Veracytes Afirma® Gene Expression Classifier Cost-Effectively Resolves Inconclusive Thyroid Nodule FNA Biopsy Results
9. SynCo Bio Partners Expands the Class A Zone in its Aseptic Filling Facility
10. HCCS Releases Classroom Management Features for Low Cost Learning Management System
11. Ohios Bioscience Industry Thrives With World-Class Industry Collaboration
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/8/2016)... SHELTON, Conn. , Feb. 8, 2016  NanoViricides, Inc. (NYSE ... that its CEO, Eugene Seymour , MD, MPH, will present ... 5:30PM at the Waldorf-Astoria Hotel in New York City ... presentation will be in the Windsor Room at 5:30PM EST. Registered ... New York City . --> ...
(Date:2/6/2016)... VA (PRWEB) , ... February 06, 2016 , ... The ... session, cost-free, for middle and high school teachers on Wednesday February 10, 2016. ... held at the Smithsonian-Mason School of Conservation, located at 1500 Remount Road in Front ...
(Date:2/5/2016)... On Thursday, February 11, 2-1-1 San ... health and disaster services, and the Community Information ... care coordination and service delivery for the community to ... to better connect service providers to the information they ... Diego has handled more than 2.5 million ...
(Date:2/4/2016)... , February 4, 2016 - New FDA action date ... New FDA action date of July 22, ... July 22, 2016   - Lifitegrast ... the past decade indicated for the treatment of signs and symptoms of ... has the potential to be the only product approved in the U.S. in the ...
Breaking Biology Technology:
(Date:1/27/2016)... Jan. 27, 2016  Rite Track, Inc. a leading ... West Chester, Ohio announced today the ... staff, based in Austin, Texas , ... to provide modifications, installations and technical support offerings for ... of PLUS, commented, "PLUS has provided world class service ...
(Date:1/25/2016)... 25, 2016  Glencoe Software, the world-leading supplier of ... industries, will provide the data management solution OMERO Plus ... Photo - ... Phenotypic analysis measures the characteristics and ... comparisons between states such as health and disease, the ...
(Date:1/22/2016)... 22, 2016 ... the "Global Biometrics Market in Retail ... --> http://www.researchandmarkets.com/research/p74whf/global_biometrics ) has ... Biometrics Market in Retail Sector 2016-2020" ... Research and Markets ( http://www.researchandmarkets.com/research/p74whf/global_biometrics ) ...
Breaking Biology News(10 mins):