News

Aalto University researchers predicted existence of new quantum matter theoretically

The results are important in the search for new quantum states and possible use in future electronics applications.

 

The state of the topological superconductor predicted by researchers on the surface. The red arrows show magnetic atoms, such as iron, which form a regular structure on the surface of the superconducting metal. The topological superconducting area is surrounded by unidirectional edge states.

Aalto University researchers have succeeded to predict, in theory, that superconducting surfaces can become topological superconductors when magnetic iron atoms are deposited on the surface in a regular pattern. They used the latest mathematical and physical models to predict the existence of a topological superconducting state on metallic superconducting surfaces and thin films. The results were recently published in the Physics Review Letters science journal.

The work examines the properties of superconductors in low temperatures. The results are important in the search for new quantum states and possible use in future electronics applications.

– We know that in a quantum state, electric current moves without resistance on the surfaces of superconducting metals. This is an interesting phenomenon that we wanted to study in more detail. Topological superconductors differ from normal ones in that they have a current constantly moving around their edges. This current contains exotic particles called Majorana fermions. We obtained reliable signals from these particles in tests performed at the end of last year, explains Academy Research Fellow Teemu Ojanen from the Aalto University Low Temperature Laboratory.

– The edges of a topologically superconducting surface are unidirectional, and thus the current is only transported in a single direction. However, the number and direction of edge states can vary. This situation could be compared to a traffic circle in which the number of lanes and the direction can change, Ojanen continues.

It has been theoretically predicted that Majorana fermions have properties that can help create complicated quantum states, for example, by braiding the particles around each other. The structures produced in this manner can be utilised for coding information and future applications likely include quantum computers.

  • Published:
  • Updated:
Share
URL copied!

Related news

Jaakko Lehtinen
Press releases Published:

Nearly 4 million euro for pioneering research in machine vision and tailor-made biosynthesis

Professors Jaakko Lehtinen and Jan Deska receive the sought-after ERC Consolidator Grants.
aalto university comet interceptor image: George Brydon, MSSL/UCL
Press releases, Research & Art Published:

The ESA Comet Interceptor enters mission analysis phase with significant Finnish contributions

A new Comet Interceptor mission was selected by the European Space Agency (ESA) for the early mission analysis phase. Comet Interceptor, planned to be launched in 2028, will study an entirely new comet which is flying through our Solar System for the first time.
Sotavangit
Press releases Published:

WarSampo publishes new Linked Open Data on the over 4,000 Finnish prisoners of war in Soviet Union

The Prisoners of War web application is based on archival material from Finland and Russia. The data is a part of the WarSampo application, which has been used by over half a million Finns to date.
Starting Up Pic: Aalto University
Press releases, Studies, University Published:

Aalto University launches free-for-all online entrepreneurship course 'to make sure no great idea goes unpursued'

Starting Up is co-created by students and the European startup community and is a new contribution to open education by the country that brought Elements of AI to the world