Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Researchers Find New State of Material at the Nanoscale

01.10.2009
Researchers at the University of Arkansas and University of California-Los Angeles have discovered a new kind of quantum state of material at the nanoscale level that appears at low temperatures.

Research professor Sergey Prosandeev and professor Laurent Bellaiche of the University of Arkansas and A.R. Akbarzadeh of the University of California-Los Angeles report the state, called incipient ferrotoroidics, in Physical Review Letters.

The researchers asked what happens to nanoscale materials at low temperatures. Classical mechanics predict that atoms stop moving at low temperatures, but quantum mechanics predict that atoms continue to vibrate even at low temperatures. Such quantum mechanical vibrations are known to cause the disappearance of the spontaneous electric polarization in some bulk materials, and these materials are called incipient ferroelectrics. However, scientists don’t know what happens to nanoscale materials at low temperatures.

“What about the nanoscale ferroelectrics? Do they show quantum effects? Do they suppress polarization or promote new properties?” Prosandeev asked.

To answer these questions, the researchers modified the complicated computer codes aimed at resolving the behavior of bulk incipient ferroelectrics at low temperatures so they would describe nanostructures. They used the high-performance computing facility Star of Arkansas to perform the calculations. They performed both classical and quantum mechanics calculations, some of which took weeks using 128 processors.

At low temperatures, they discovered a new kind of quantum state of material. Called incipient ferrotoroidics, it is a state where quantum vibrations wash out the formation of recently discovered vortex states. This creates a situation where the material’s susceptibility to toroidal moment is high and independent of temperature – meaning that a small, curled field can create a strong vortex at any given moment.

“In electric capacitors we have electrons,” Prosandeev said. “Here we have topological charges instead.”

This means that it should be possible to create a new kind of device — namely, a topological charge capacitor — in nanoscale material at low temperatures. A vortex could be triggered in such a material using small changes in some chiral electric field.

“We predict that there is a way to prepare this original state of material,” Prosandeev said. “This opens the door to a new direction for applications and for thinking.”

This research was supported by grants from the Office of Naval Research and the National Science Foundation.

CONTACTS:
Laurent Bellaiche, 21st Century Endowed Professor in Nanotechnology and Science Education
J. William Fulbright College of Arts and Sciences
479-575-6425, laurent@uark.edu
Sergey Prosandeev, research professor
J. William Fulbright College of Arts and Sciences
479-575-6668, sprossan@uark.edu

Melissa Lutz Blouin | Newswise Science News
Further information:
http://www.uark.edu

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Writing and deleting magnets with lasers

Study published in the journal ACS Applied Materials & Interfaces is the outcome of an international effort that included teams from Dresden and Berlin in Germany, and the US.

Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia...

Im Focus: Gamma-ray flashes from plasma filaments

Novel highly efficient and brilliant gamma-ray source: Based on model calculations, physicists of the Max PIanck Institute for Nuclear Physics in Heidelberg propose a novel method for an efficient high-brilliance gamma-ray source. A giant collimated gamma-ray pulse is generated from the interaction of a dense ultra-relativistic electron beam with a thin solid conductor. Energetic gamma-rays are copiously produced as the electron beam splits into filaments while propagating across the conductor. The resulting gamma-ray energy and flux enable novel experiments in nuclear and fundamental physics.

The typical wavelength of light interacting with an object of the microcosm scales with the size of this object. For atoms, this ranges from visible light to...

Im Focus: Basel researchers succeed in cultivating cartilage from stem cells

Stable joint cartilage can be produced from adult stem cells originating from bone marrow. This is made possible by inducing specific molecular processes occurring during embryonic cartilage formation, as researchers from the University and University Hospital of Basel report in the scientific journal PNAS.

Certain mesenchymal stem/stromal cells from the bone marrow of adults are considered extremely promising for skeletal tissue regeneration. These adult stem...

Im Focus: Like a wedge in a hinge

Researchers lay groundwork to tailor drugs for new targets in cancer therapy

In the fight against cancer, scientists are developing new drugs to hit tumor cells at so far unused weak points. Such a “sore spot” is the protein complex...

Im Focus: The Future of Ultrafast Solid-State Physics

In an article that appears in the journal “Review of Modern Physics”, researchers at the Laboratory for Attosecond Physics (LAP) assess the current state of the field of ultrafast physics and consider its implications for future technologies.

Physicists can now control light in both time and space with hitherto unimagined precision. This is particularly true for the ability to generate ultrashort...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

IWOLIA: A conference bringing together German Industrie 4.0 and French Industrie du Futur

09.04.2018 | Event News

 
Latest News

Diamond-like carbon is formed differently to what was believed -- machine learning enables development of new model

19.04.2018 | Materials Sciences

Electromagnetic wizardry: Wireless power transfer enhanced by backward signal

19.04.2018 | Physics and Astronomy

Ultrafast electron oscillation and dephasing monitored by attosecond light source

19.04.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>