STOCK MARKET BSE NSE

Chinese scientists discover new type of fermion

Chinese scientists have discovered a new type of fermion, a subatomic particle, that opens up a way of exploring the interplay between unconventional fermions in condensed matter systems.

Published: 20th June 2017 07:53 PM  |   Last Updated: 20th June 2017 07:53 PM   |  A+A-

By PTI

BEIJING: Chinese scientists have discovered a new type of fermion, a subatomic particle, that opens up a way of exploring the interplay between unconventional fermions in condensed matter systems.     

The research team was led by scientists with the Institute of Physics of the Chinese Academy of Sciences (CAS), whose findings were published in the online version of the academic journal "Nature Communications" yesterday.   

In quantum field theory, Lorentz invariance leads to three types of fermion -- Dirac, Weyl and Majorana. The existence of Dirac and Weyl fermions in condensed matter systems has been confirmed experimentally, and that of Majorana fermions is supported by various experiments, state- run Xinhua news agency reported.     

In condensed-matter systems, however, fermions in crystals are "constrained by the symmetries of the crystal space groups rather than by Lorentz invariance," giving rise to the possibility of finding other types of fermionic excitation that have no counterparts in high-energy physics.     

The CAS scientists used a technique to observe the distribution of electrons, called angle-resolved photoemission spectroscopy, which demonstrated the existence of a "triply degenerate point in the electronic structure of crystalline molybdenum phosphide," -- a brand new discovery in field of fermion research.     

They have also observed pairs of Weyl points in the bulk electronic structure of the crystal that coexist with the three-component fermions.

Stay up to date on all the latest World news with The New Indian Express App. Download now

Comments

Disclaimer : We respect your thoughts and views! But we need to be judicious while moderating your comments. All the comments will be moderated by the newindianexpress.com editorial. Abstain from posting comments that are obscene, defamatory or inflammatory, and do not indulge in personal attacks. Try to avoid outside hyperlinks inside the comment. Help us delete comments that do not follow these guidelines.

The views expressed in comments published on newindianexpress.com are those of the comment writers alone. They do not represent the views or opinions of newindianexpress.com or its staff, nor do they represent the views or opinions of The New Indian Express Group, or any entity of, or affiliated with, The New Indian Express Group. newindianexpress.com reserves the right to take any or all comments down at any time.

flipboard facebook twitter whatsapp