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:
URL copied!

Read more news

Samuel Kaski
Press releases Published:

Samuel Kaski receives major international funding for the development of AI methods

Aalto University Professor Samuel Kaski has been awarded the Turing AI World-Leading Researcher Fellowship to establish a new center of excellence. The funding relates to Kaski’s work at the University of Manchester, but Finnish research on modeling user intent will also benefit.
Vastaajat arvioivat organisaation näkökulmasta esimerkiksi sitä, ovatko ihmiset lämpimiä ja hyväksyviä toisiaan kohtaan tai tuovatko he toisten parhaat puolet esiin.  Kuvituskuva,Unto_Rautio_Aalto
Press releases Published:

Systems intelligent organisations succeed – regardless of structures

Aalto University researchers have created a new metric for a successful organisation capable of learning.
Omnidirectional Transmitter, image: Prasad Jayathurathnage/Aalto University
Press releases, Research & Art Published:

New type of wireless charger can charge multiple devices simultaneously

Device transfers energy with 90% efficiency within 20-centimetre charging range
Ligniinillä käsitelty tuoli
Press releases, Research & Art Published:

Bio-based coating for wood outperforms traditional synthetic options

Researchers turn a non-toxic residue into wood coating that resists abrasion-, stain-, and sunlight.