visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2022-10-26 10:00 
연사  
장소 E6-2 #2502 

물리학과 세미나 안내 드립니다. 관심있는 분들의 많은 참여 부탁드립니다.

 

- Title: Replica Higher-Order Topology of Hofstadter Butterflies in Twisted Bilayer Graphene
- Speaker: Dr. Sun-woo Kim(Univ. of Cambridge)
- Date: Oct. 26th (Wed) 2022, 10:00AM,
- Place: E6-2, #2502
Abstract: 

 

The Hofstadter energy spectrum of twisted bilayer graphene is found to have recursive higher-order topological properties. We demonstrate that higher-order topological insulator (HOTI) phases, characterized by localized corner states, occur as replicas of the original HOTIs to fulfill the self-similarity of the Hofstadter spectrum. We show the existence of the exact flux translational symmetry of twisted bilayer graphene at all commensurate angles. Based on this result, we carefully identify that the original HOTI phase at zero flux is re-entrant at a half-flux periodicity, where the effective twofold rotation is preserved. In addition, numerous replicas of the original HOTIs are found for fluxes without protecting symmetries. Similar to the original HOTIs, replica HOTIs feature both localized corner states and edge-localized real-space topological markers. The replica HOTIs originate from the different interaction scales, namely, intralayer and interlayer couplings, in twisted bilayer graphene. The topological aspect of Hofstadter butterflies revealed in our results highlights symmetry-protected topology in quantum fractals.

번호 날짜 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
374 2022-05-19 16:00    Chasing Long Standing Neutrino Anomalies with MicroBooNE
373 2022-05-19 15:00    (광학분야 특별세미나)Development of a multimodal optical system for improved disease diagnosis
372 2022-05-19 15:00    (광학분야 특별세미나)Development of a multimodal optical system for improved disease diagnosis
371 2022-05-18 16:00    Geometry, Algebra, and Quantum Field Theory
370 2022-05-16 16:00    Design synthetic topological matter with atoms and lights
369 2022-05-13 16:00    High-fidelity iToffoli gate for fixed-frequency superconducting qubits file
368 2022-05-13 14:30    Topological Superconducting Spintronics Towards Zero-Power Computing Technologies file
367 2022-05-12 16:00    New frontiers of electroweak physics at the LHC
366 2022-05-11 16:00    Gravity as a phenomenon in quantum dynamics
365 2022-05-10 16:00    (광학분야 특별세미나)Testing quantum thermodynamics using quantum optics
364 2022-05-09 16:00    Searching for new electronic properties in correlated material flatland
363 2022-05-02 16:00    What can we learn from the history of science and technology?(우리말강의)
362 2022-04-28 16:00    (광학분야 특별세미나)Adiabaticity and symmetry in optical waveguide design
361 2022-04-25 16:00    Ultrafast electron beam, a tool to explore the nanoscopic world of materials(우리말강의)
360 2022-04-15 11:00    (응집물리 세미나) First-principles studies of polar oxides and their applications file
359 2022-04-14 16:00    (광학분야 특별세미나)Holographic tomography of dielectric tensors at optical frequency
358 2022-04-13 10:30    Harnessing topology and correlations from singularities in 3d-kagome metals
357 2022-04-11 16:00    Emergence of Statistical Mechanics in Quantum Systems
356 2022-04-08 11:00    (응집물리 세미나) Flat-surface-assisted physical phenomena occurring in single crystal metal thin film file
355 2022-04-04- 16:00    New paradigms in Quantum Field Theory