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!

Related news

Illustration on beige background: two students painting a big yellow lightbulb.
Press releases, Studies Published:

Apply to Aalto Thesis project: HSL - Software Production 2.0!

Aalto Thesis project's application is open for Master's students. Read more of HSL's project and apply!
Tiina Tuurnala, Alumna of the Year 2019, School of Engineering
Appointments, Press releases Published:

Tiina Tuurnala named as Aalto University School of Engineering Alumna of the Year 2019

'My current position is an excellent vantage point for working toward zero-emission seafaring together with other stakeholders.'
Aiheet, joissa rasismista puhuttiin
Press releases Published:

Discussions about racism strongly differ in the Finnish news media and discussion forums

On the popular Suomi24 discussion forum, users see immigration and minorities as a threat to “the ordinary Finnish people”, while journalists address racism from a historical and international perspective.
DigiEduHack image by DigiEduHack
Campus, Press releases, University Published:

DigiEduHack is reinventing the future of learning and education

DigiEduHack will break continental barriers by connecting around 50 educational institutions worldwide in order to solve the world’s most pressing challenges in digital education