Featured Research

from universities, journals, and other organizations

Scientists predict fermionic matter in a previously unknown state

Date:
June 17, 2014
Source:
Moscow Institute of Physics and Technology
Summary:
Scientists have presented theoretical calculations which indicate the possible existence of fermionic matter in a previously unknown state -- in the form of a one-dimensional liquid, which cannot be described within the framework of existing models.

A researcher with the Department of Electrodynamics of Complex Systems and Nanophotonics, Alexander Rozhkov, has presented theoretical calculations which indicate the possible existence of fermionic matter in a previously unknown state -- in the form of a one-dimensional liquid, which cannot be described within the framework of existing models.

Related Articles


Rozhkov explained that the one-dimensional liquid state of matter is not necessarily one that can be observed with the naked eye on a macroscopic scale. The term "liquid" should be understood broadly, he said; it applies to models describing multi-particle systems with inter-particle interaction. Such models can be described as quite ordinary objects such as electrons in conductors and more sophisticated objects,such as nanotubes, nanowires or graphene sheets.

"Currently there are two general models of fermionic matter, namely fermionic liquid (for three- and two-dimensional spaces) and Tomonaga-Luttinger liquid (for one-dimensional space)," Rozhkov said. "I showed that it is possible to produce yet another state of one-dimensional matter adjusting certain interactions. This state is similar to both of these models, but cannot be reduced to either. I suggested calling it aquasi-fermionic liquid."

As follows from the proposed name, the newly found matter consists of fermions, which are particles with half-integer spin. (Spin is the quantum characteristic of a particle, while half-integer is an integer plus one-half.) According to the laws of quantum mechanics, the behavior of substances consisting of fermions differs from that of matter consisting of bosons, which are particles with integer spin.

The difference between Bose and fermionic liquids can be illustrated with the example of liquid helium: the atom of a helium-4 isotope has a Bose nucleus, and forms of Bose liquid that undergoes Bose condensation at temperatures below 2.17 Kelvin. A Bose-condensed liquid exhibits superfluidity, for example, it can flow through any crack without meeting any resistance. Helium-3 has a fermion nucleus, and therefore forms afermionic liquid. To turn helium-3 into a superfluid one needs to cool it to 0.0025 Kelvin.

Rozhkov also noted that at low temperatures and in high magnetic fields, fermions begin to behave as if they had no spin, which simplifies their modeling, allowing a researcher to maintain sufficient accuracy.

Preliminary estimates show that the new one-dimensional liquid statecan be obtained using atoms cooled to very low temperatures in magnetic traps. However, it is still too early to consider the practical application of such a system, according to Rozhkov.

"In almost any contemporary paper, both theoretical and experimental, researchers describe the practical application of their discovery, but at this stage I would not hope too much for any practical application," Rozhkov said. "I found an exotic mutant different from anything currently known. And whether this can be applied in practice remains to be seen. At this moment I don't think so," said Rozhkov.

Rozhkov added that the group of researchers he works with is also looking into other low-dimensional and multi-particle systems. For example, new results were recently obtained on the possible anti-ferromagnetism in two-layer graphene-AA, and a new description for quantum dots of superconducting material was drafted.


Story Source:

The above story is based on materials provided by Moscow Institute of Physics and Technology. Note: Materials may be edited for content and length.


Journal Reference:

  1. A. V. Rozhkov. One-Dimensional Fermions with neither Luttinger-Liquid nor Fermi-Liquid Behavior. Physical Review Letters, 2014; 112 (10) DOI: 10.1103/PhysRevLett.112.106403

Cite This Page:

Moscow Institute of Physics and Technology. "Scientists predict fermionic matter in a previously unknown state." ScienceDaily. ScienceDaily, 17 June 2014. <www.sciencedaily.com/releases/2014/06/140617112010.htm>.
Moscow Institute of Physics and Technology. (2014, June 17). Scientists predict fermionic matter in a previously unknown state. ScienceDaily. Retrieved November 21, 2014 from www.sciencedaily.com/releases/2014/06/140617112010.htm
Moscow Institute of Physics and Technology. "Scientists predict fermionic matter in a previously unknown state." ScienceDaily. www.sciencedaily.com/releases/2014/06/140617112010.htm (accessed November 21, 2014).

Share This


More From ScienceDaily



More Matter & Energy News

Friday, November 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

NSA Director: China Can Damage US Power Grid

NSA Director: China Can Damage US Power Grid

AP (Nov. 20, 2014) China and "one or two" other countries are capable of mounting cyberattacks that would shut down the electric grid and other critical systems in parts of the United States, according to Adm. Michael Rogers, director of the National Security Agency and hea Video provided by AP
Powered by NewsLook.com
Latest Minivan Crash Tests Aren't Pretty

Latest Minivan Crash Tests Aren't Pretty

Newsy (Nov. 20, 2014) Five minivans were put to the test in head-on crash simulations by the Insurance Institute for Highway Safety. Video provided by Newsy
Powered by NewsLook.com
Takata Offers "sincerest Condolences" To Victims of Malfunctioning Airbag

Takata Offers "sincerest Condolences" To Victims of Malfunctioning Airbag

Reuters - US Online Video (Nov. 20, 2014) U.S. Congress hears from a victim and company officials as it holds a hearing on the safety of Takata airbags after reports of injuries. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
DARPA Creates The Tech You Can Only Dream Of

DARPA Creates The Tech You Can Only Dream Of

Newsy (Nov. 20, 2014) Curious what a rocket-dodging car would look like? How about a robotic pack mule? Or maybe a wearable robot? These are a few of DARPA's projects. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins