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울산대학교 중점연구소(EHSRC)입니다.

7월 5일(목) 오후 5시에 8호관 327호에서 노스웨스턴대의 진호섭 연사님을 모시고 'Topological insulating phase in cubic system' 이란 주제로 아래와 같이 세미나를 개최하오니, 관심 있는 분들의 많은 참석 부탁드립니다

- 아 래

1. 연 사 :  진호섭박사 (Northwestern University)

 2. 제 목 : Topological insulating phase in cubic system

3. 일 시 : 7월 5일(목) 오후 5시

4. 장 소 : 8호관 327호

-초 록

      Topological insulating phase in cubic system

Hosub Jin
Department of Physics and Astronomy,
Northwestern University, Evanston, Illinois 60208, USA

Recently, much attention has focused on three-dimensional strong topological insulators as a
new quantum state of matter, such as Bi2Se3 and Bi2Te3. Here we suggest topologically non-trivial
electronic structures in cubic systems based on the tight-binding analysis. Assuming the well
separated s- and p-states and hopping parameters, we can set up an 8x8 tight-binding Hamiltonian,
and the trivial to non-trivial topological phase transition occurs by tuning the hopping parameters
or spin-orbit coupling strength. Our tight-binding Hamiltonian is reduced to a 4x4 continuum
model which is the minimal model to describe the topological phase transition. Topologically
protected surface states in the slab geometry are also shown within our model. Finally, we show
the DFT realization of the tight-binding model in several cubic perovskite systems.

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