Euler topology in honeycomb lattices
일 시 : 2025년 04월 07일 월요일 17:00
연 사 : Rasoul Ghadimi 박사 (Center of Theoretical Physics, IBS)
장 소 : 자연과학관 203호
초 록
In space-time inversion symmetric systems, we can find a suitable unitary transformation in which the wave functions and Hamiltonian are real and bands can obtain nontrivial Euler topology. It is shown that nontrivial Euler topology is important for understanding band structure properties of certain insulating or semimetals. In this talk, I will introduce briefly Euler topology and then show how honeycomb lattices can give Euler topology and its non-Abelian braiding phenomenon.
Ref1: Non-Abelian charge conversion in bilayer binary honeycomb lattice systems (arXiv:2411.06724 [2024])
Ref2: Quantum Valley Hall Effect without Berry Curvature (PhysRevLett.133.196603 [2024])
Ref3: Quantum valley and sub-valley Hall effect in large-angle twisted bilayer graphene (PhysRevB.108.L121405 [2023]])