Group Seminar 2021/22

Abstract:

Majorana fermion is a long-sought particle in Physics. It is charge
neutral 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

Passcode: @#mAk0