Quantum Matter Seminar by Dr. Tiantian Zhang on March 24, 2022

The Quantum Matter Study Group invited Dr. Tiantian Zhang from Tokyo Institute of Technology to talk about the local and global topology for Tg-protected Z₂ Dirac points. In the beginning, by introducing the topological phase in the gapped and gapless systems, she discussed the conventional and Z₂ Dirac points. Surprisingly, she established gauge-invariant charge formula and bulk-surface correspondence for Z₂ Dirac points, which can give a full understanding about the topology of Tg-protected Z₂ Dirac points. Then, she proposed the first Z₂ Dirac material candidate Li2B4O7 for further exploration.

Reported by Congcong Le