visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

Topological Dirac insulator

2017.05.10 14:46

관리자 조회 수:2636

날짜 2017-05-12 13:30 
연사  
장소 E6-2. 1st fl. #1323 

“Topological Dirac insulator”

 

Dr. Young Kuk Kim 

Sungkyunkwan University 

 

May. 12 (Fri.), 01:30 PM

E6-2. 1st fl. #1323

 

 

The discovery of a topological insulator in 2005 led to remarkable development of topological band theory, revealing a variety of symmetry-protected topological insulators and semimetals. Here we introduce our recent finding of a novel topological crystalline insulating phase, referred to as a topological Dirac insulator [1]. A topological Dirac insulator is a bulk insulator with protected metallic surface states, allowed by non-symmorphic space group symmetries. Unlike conventional topological insulators, the surface states of a topological Dirac insulator occur as a four-fold degenerate Dirac point, considered as a topological phase boundary between a two-dimensional topological insulator and a normal insulator. We introduce Z4xZ2 topological invariants that characterizes topological Dirac insulator phase and demonstrate how to evaluate from the Wilson loop calculations. We also discuss its material realizations based on first-principles calculations.

 

[1] Wieder, Benjamin J., Barry Bradlyn, Zhijun Wang, Jennifer Cano, Youngkuk Kim, Hyeong-Seok D. Kim, A. M. Rappe, C. L. Kane, and B. Andrei Bernevig. "Wallpaper Fermions and the Topological Dirac Insulator." arXiv preprint arXiv:1705.01617 (2017). 

 

Contact: Eun Gook Moon, Physics Dept., (egmoon@kaist.ac.kr)

 

번호 날짜 연사 제목
130 2018-05-17 13:30    Quantum Spin Liquid in Kitaev Materials file
129 2015-10-23 10:30    How to write a good scientific paper[Open lecture series]
128 2020-12-23 10:00    Online workshop for Quantitative Phase Imaging file
127 2024-07-23 16:00    Spin Conversion Research Towards Novel Spintronic Functionalities file
126 2017-04-06 16:00    For whom the Belle tolls
125 2016-11-01 14:30    Search for dark sector particles in the B-factory experiments
124 2015-10-16 16:00    Fluctuations of entropy production in partially masked electric circuits
123 2019-07-25 16:00    Band topology of twisted bilayer graphene file
122 2019-09-18 16:00    Exploring Synthetic Quantum Matter in Superconducting Circuits file
121 2017-04-27 16:00    반도체 양자점을 이용한 단광자 광원
120 2022-04-15 11:00    (응집물리 세미나) First-principles studies of polar oxides and their applications file
119 2017-11-28 16:00    Physics after the lab and the desk: Your work in PRL file
118 2015-07-16 16:00    KAIST Physics Distinguished Lecture
117 2021-11-02 16:00    Metrology of Band Topology via Resonant Inelastic X-ray Scattering file
116 2023-01-11 11:00    Directly proving magnetoelastic coupling in a soft ferromagnet using Lorentz 4D-STEM file
115 2016-09-29 16:00    2016 Fall, Physics Seminar Serises file
114 2022-12-13 11:00    Art of thin film engineering toward topological quantum computation file
113 2023-12-19 16:00    [High Energy Theory Seminar] Non-invertible symmetries, leptons, quarks, and why multiple generations
112 2020-02-20 16:00    Unconventional superconductivity in the locally non-centrosymmetric heavy-fermion CeRh2As2 file
111 2024-01-16 14:00    Dimer Physics and Superconductivity in La3Ni2O7