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:
Melissa Lutz Blouin | Newswise Science News
3-D-printed structures shrink when heated
26.10.2016 | Massachusetts Institute of Technology
From ancient fossils to future cars
21.10.2016 | University of California - Riverside
Ultrafast lasers have introduced new possibilities in engraving ultrafine structures, and scientists are now also investigating how to use them to etch microstructures into thin glass. There are possible applications in analytics (lab on a chip) and especially in electronics and the consumer sector, where great interest has been shown.
This new method was born of a surprising phenomenon: irradiating glass in a particular way with an ultrafast laser has the effect of making the glass up to a...
Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion
Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
26.10.2016 | Materials Sciences
26.10.2016 | Health and Medicine
26.10.2016 | Physics and Astronomy