Description of Research Area

Creation and Annihilation of Fractionally-Charged Quasiparticles in Quantum Hall Junctions

Research Subject

Fractional quantum Hall (QH) system is one of the most exciting fields of research for quantum many-body systems. Surprisingly, an elementary excitation (quasiparticle) in a fractional QH state has a fractional charge smaller than an elementary charge, which is associated with highly-correlated nature of electrons. Fractional charge of quasiparticles has been determined by measuring nonequilibrium noise generated at a tunnel junction embedded in a single QH system. In this work, creation and annihilation of these quaiparticles will be investigated in QH junctions, where a fractional QH state is sandwiched by other QH systems with different Landau level filling factors. In such systems, we can expect to observe various phenomena depending on the combination of filling factors and to obtain fascinating information on dynamics of fractional quasiparticles. We believe that this work will give a significant impact on condensed matter physics as an important research for quantum many-body physics.