Navigation Links
Evidence of macroscopic quantum tunneling detected in nanowires
Date:5/27/2009

CHAMPAIGN, Ill. A team of researchers at the University of Illinois has demonstrated that, counter to classical Newtonian mechanics, an entire collection of superconducting electrons in an ultrathin superconducting wire is able to "tunnel" as a pack from a state with a higher electrical current to one with a notably lower current, providing more evidence of the phenomenon of macroscopic quantum tunneling.

Physics professors Alexey Bezryadin and Paul Goldbart led the team, with graduate student Mitrabhanu Sahu performing the bulk of the measurements. Their research was published on the Web site of the journal Nature Physics on May 17.

Quantum tunneling is the capability of a particle to inhabit regions of space that would normally be off-limits according to classical mechanics. This research observes a process called a quantum phase slip, whereby packs of roughly 100,000 electrons tunnel together from higher electrical current states to lower ones. The energy locked in the motion of the electrons as they phase slip is dissipated as heat, causing the nanowires to switch from a superconducting state to a more highly resistive one.

It's through this switching of states that allows the tunneling of the phase slip to be observed, the researchers say.

Goldbart, who is also a researcher at the university's Frederick Seitz Materials Research Laboratory, describes a quantum phase slip as a phenomenon that allows the spatially extended structure of superconductivity "to undergo a kind of quantum mechanical rip or tear, one where the entire extended behavior of the superconductivity tunnels its way through a classically forbidden set of configurations."

"Semiconductors, insulators and metals all hinge upon the ability of particles to make it through classically forbidden regions, despite apparently having negative kinetic energy there, as quantum physics allows," Goldbart said.

In Newton's world, according to
'/>"/>

Contact: Phil Ciciora
pciciora@illinois.edu
217-333-2177
University of Illinois at Urbana-Champaign
Source:Eurekalert  

Page: 1 2

Related biology technology :

1. CPM Resource Center and The Shams Group Partner To Help Hospitals Integrate Evidence-Based Clinical Content Into Information Systems
2. MichBio Leader Cites New Senate Biosciences Task Force and House Subcommittee as Evidence of States Growing Awareness of Industrys Economic Importance
3. ULURU to Present Clinical Evidence and Advanced Research on Altrazeal at the Society for Advance Wound Care Conference for 2009
4. Agendia Publishes Direct Evidence That MammaPrint Predicts Benefit of Chemotherapy in Breast Cancer
5. Evidence of Ancient Hot Springs on Mars Detailed in Astrobiology Journal
6. Cancer Clinics of Excellence (CCE) Releases 62nd Evidence-Based Treatment Protocol
7. The Lancets New Online Medical Journal Helps Clinicians and Medical Researchers Find Practice-Changing Evidence Quickly and Easily
8. More Evidence Published That Epidemics of Childhood Obesity, Type 2 Diabetes and Metabolic Syndrome are Linked to Immunization
9. Kaiser Permanente Study Shows Newer, Stronger Evidence That Caffeine During Pregnancy Increases Miscarriage Risk
10. Revolutionary Genomics Research Group Opens Boston Office; Provides DNA Evidence in Workers Comp Cases
11. PDL BioPharma Announces Internal CEO Investigation Found No Credible Evidence of Improper Personal Conduct or Breach of Fiduciary Duty
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Evidence of macroscopic quantum tunneling detected in nanowires
(Date:1/15/2014)... NIAGARA FALLS, N.Y., Jan. 15, 2014   Niagara ... has been selected by Buffalo BioBlower Technologies LLC ("B3") ... its SBIR Phase 2 award from the Army Corps ... purification system that kills all biological contaminants and destroys ...
(Date:1/15/2014)... ­ RedBrick Health , a fast-growing leader in ... that EmblemHealth , the New York ... providing the RedBrick Compass health assessment, combined with the ... its members. EmblemHealth is among the first health plans ...
(Date:1/15/2014)... 2014 Two champions of science, technology, ... of an annual competition for middle and high school ... innovative STEM study. The competition presents students with real-world ... Engineering Aptitude, Mathematics, and Sciences is a program ...
(Date:1/15/2014)... CA (PRWEB) January 15, 2014 ... research solutions, today announced that Lupin Limited, one of ... Freeslate’s CM Protégé PharmD System for high ... Mumbai, India, is focused on a wide range of ...
Breaking Biology Technology:Niagara Thermal Products LLC Selected as Critical Supplier for Buffalo BioBlower Air Purification Systems 2EmblemHealth Selects RedBrick Health to Power its Next-Generation Health Engagement and Behavior Change System 2EmblemHealth Selects RedBrick Health to Power its Next-Generation Health Engagement and Behavior Change System 3Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 2Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 3Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 4Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 5Lupin Selects Freeslate’s CM Protégé PharmD System to Accelerate Polymorph Screening for Drug Development 2Lupin Selects Freeslate’s CM Protégé PharmD System to Accelerate Polymorph Screening for Drug Development 3
... to implement a Web project, there is no shortage of vendors ... the best choice? , ,Selecting the right Web developer, Web designer, ... can be a challenge. You want to be sure that the ... and marketing needs in the process, and maintains an adequate level ...
... State Senator Ted Kanavas remains optimistic that his ... pass the legislature yet this year. , ... Representative Jeff Fitzgerald, R-Horicon, would require companies that ... notify those people when that data is obtained ...
... Wisconsin System and partners around the state have been awarded ... to create health-care training projects to help resolve the nationwide ... Fast-Track (SWIFT) Nurse Educators program, which started as a task ... reduce the training period for nurses by anywhere from 18 ...
Cached Biology Technology:The best and the rest: rating Web developers 2The best and the rest: rating Web developers 3The best and the rest: rating Web developers 4Kanavas thinks personal ID theft bill will pass this year 2
(Date:4/17/2014)... Professor Luca Razzari of the nergie Matriaux Tlcommunications ... from the John R. Evans Leaders Fund of ... acquisition of state-of-the-art biotech and nanophotonics equipment. To ... the Ministre de l,Enseignement suprieur, de la Recherche, ... These new laboratories will help us develop new ...
(Date:4/17/2014)... University engineer has developed a patented technique that ... devices. The same technique could help police during ... and Kay L. Theede chair in engineering and ... his research team have created a template-based system ... trunks. The distance detection method called stand-off ...
(Date:4/17/2014)... in German . ... money demanded of him, he can expect his premises to ... fear of the consequences is enough to make restaurant owners ... which lay their eggs in other birds, nests. If the ... take their revenge by destroying the entire nest. Consequently, it ...
Breaking Biology News(10 mins):New state-of-the-art biotech and nanotech equipment for INRS 2Patented research remotely detects nitrogen-rich explosives 2Fear of the cuckoo mafia 2Fear of the cuckoo mafia 3
... A new minute freshwater snail species belonging to the genus ... Athens (Canella Radea) in a spring covered by snow on ... access journal Zookeys . The ... shell, grey-black pigmented soft body and a black penis with a ...
... investigating a murder, every clue helps. New research from North ... blow flies survive when buried underground during their development. ... long a body may have been left above ground before ... one grave to another. "Blow flies are probably the ...
... R.I. [Brown University] Doctors agree that vitamin D promotes ... cancer, cardiovascular disease and other causes of death has been ... by the Institute of Medicine, a new study finds that ... women after controlling for key health factors such as abdominal ...
Cached Biology News:Digging up clues: Research on buried blow flies to help crime scene investigators 2Vitamin D study suggests no mortality benefit for older women 2
Porcine Aortic Smooth Muscle Cells (PAOSMC) (>500,000 cells)...
Bovine Renal Artery Smooth Muscle Cells (BRASMC) (>500,000 cells)...
Porcine Aortic Endothelial Cells (PAOEC) (>500,000 cells)...
alpha-N-Catenin Antibody Shipping Temperature: HOT Storage Temperature: -20C...
Biology Products: