- Time: 10:00-11:00
- Location: Zoom
- Speaker: Dr Ai Yamakage
- Institution: Department of Physics, Nagoya University, Japan
- Title: Current status and perspective of Majorana fermions on topological superconductors
Majorana fermion is a long-sought particle in Physics. It is chargeneutral and own antiparticle. Surprisingly, they may emerge in nontrivial materials such as fractional quantum Hall systems, spin liquids, and topological superconductors/superfluids as gapless modes bound on the surface. One characteristic quantum phenomenon in the emergent Majorana fermion living in low-dimensional material is nonabelian statistics of particle exchange. It is a fundamental question to establish a candidate material hosting Majorana fermions and derive exotic quantum phenomena from the nonabelian nature. Unfortunately, there have been few candidates for topological superconductors. In this seminar, I will talk about the current status of exploring candidate materials and perspectives for observation of Majorana physics. First, I explain a Majorana fermion at the ends of a superconducting nanowire under a magnetic field, which has attracted much attention but has been still under debate. Second, time-reversal-invariant bulk topological superconductors and Majorana fermions on their surfaces. Third, I would like to discuss how to measure nonabelian statistics of the braiding Majorana fermions. Finally, I show our recent results on a fundamental theory toward observation and control of Majorana fermions by external electromagnetic fields, including strains/rotations.
Meeting ID: 857 4715 9197