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:

Read more news

Mustaa puuta
Research & Art Published:

Unlocking the Mysteries of Super Black Materials: A novel wood-based solution

In the ever-evolving world of science and technology, there are certain phenomena that continue to captivate the minds of scientists, artists, and the general public alike. One such phenomenon is the enigmatic world of super black materials.
A man in a white lab coat with blue gloves holds up a vial of clear liquid while standing in front of a large microscope.
Research & Art Published:

Medical innovation makes early cancer diagnostics cheaper, faster, easier

Aalto University researcher makes two-pronged improvement on microbubble technology
Two students and a professor sitting around a table, talking and looking at laptop screen.
Research & Art, Studies Published:

Call for doctoral student tutors, January 2024

Sign-up to be a tutor for new doctoral students as part of the Doctoral Orientation Days 15-16 January 2024!
vihreät liput, green flags. Kuva: Mikko Raskinen
Research & Art Published:

The Foundation for Economic Education awards significant grants to Aalto University's researchers

Aalto University receives the most support among universities. 62 projects will receive the grant, the total amount being 728,400 euros