Nanowerk July 8, 2021 Making usable quantum technologies out of rare-earth compounds has remained a challenge because they contain critically radioactive compounds rendering them of limited use in real-world quantum technologies. An international team of researchers (Switzerland, Finland) used the sub-nanometre thickness of graphene to create heavy fermions. By layering thin sheets of carbon on top of one another in a specific pattern, where each sheet is rotated in relation to the other, it is possible to create the quantum properties effect that results in the electrons in the graphene behaving like heavy fermions. While in this work they showed the […]
Tag Archives: Fermions
Electrical manipulation of magnetic particle allows for large high-speed memory
Phys.org April 20, 2020 Antiferromagnetic materials seem harder to work with but have many useful properties and they are less subject to external magnetic fields due to a unique arrangement of their constituent parts making it harder to manipulate the material as needed. According to researchers in Japan in antiferromagnetic manganese-tin alloy Mn3Sn Weyl fermions exist at Weyl points in momentum space. They have two possible states that could represent binary digits. They found that it is possible to switch a Weyl point between these states with an external electrical current applied to neighboring thin layers of Mn3Sn and either […]
Computing faster with quasi-particles
Eurekalert May 10, 2019 Majorana particles can emerge as quasi-particles in topological superconductors and represent ideal building blocks for topological quantum computers. Whereas previous experiments in this field have mostly focused on one-dimensional systems an international team of researchers (USA – Harvard University, Caltech, IBM Watson Research Laboratory, Germany) succeeded in going to two-dimensional systems. They observed a topological phase transition in their proof of concept system which implies the appearance of Majorana fermions in phase-controlled Josephson junctions confirming the advantages of two-dimensional system compared to previous one-dimensional platforms. An improved control of Majorana fermions represents an important step towards […]
Current noises of Majorana fermions
Phys.org July 23, 2018 To detect Majorana fermions researchers in China used non-equilibrium Green’s function method, analyzed the current across a topological Josephson junction and related current noises, revealing the relation between the existence of Majorana fermions and non-equilibrium current noise. In condensed matter physics, zero-energy Majorana fermions obey non-abelian statistics, and can be used in fault-tolerant topological quantum computation… read more. TECHNICAL ARTICLE