Itinerant fermions in frustrated magnetism: From integer quantum Hall effect to Majorana qubit
Par Masafumi UDAGAWA, University of Gakushuin (Tokyo) & Max Planck Institute – Physics for Complex Systems (Dresden)
Mardi 25 Juin, 14h00, Salle des séminaires (215), 2ème étage, Bâtiment A4N
Abstract :
The principle of superposition is the most fundamental law of quantum mechanics. Fractionalization is one of the exotic manifestations of this principle. We usually regard an electron as one entity, however, in some cases, it behaves as if it were a superposition of several “smaller” particles with fractional charges. Recently, an exotic Majorana fractionalization was proposed in a seminal frustrated magnetic system, called Kitaev’s spin liquid. The fractionalized Majorana zero mode exhibits unusual nonlocal character, and this is why it can be potentially used as a qubit in topological quantum computation. In this talk, we will discuss the role of integer quantum Hall effect underlying this Majorana fractionalization, and introduce our recent work for the observation of Majorana through the inelastic neutron scattering experiment.