visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2018-06-01 11:00 
연사  
장소 E6-2. 1st fl. #1323 

SRC Seminar

 

 

Topological phases in low-dimensional quantum materials

 

Dr. Seung Sae Hong

Department of Applied Physics, Stanford University

 

Jun. 01 (Fri.), 11:00 AM

E6-2. 1st fl. #1323

 

Abstract:

The concept of topology has been broadly applied to modern condensed matter physics. The talk will discuss how the materials in the reduced dimension offer new opportunities to observe topological effects in electronic and crystalline structures, with examples from two distinct quantum materials families - topological insulators and complex oxides.

In the first part, I will describe the experiments on topological insulator nanostructures (Bi2Se3), with an insulating gap in the bulk and gapless surface states. The rational nanomaterial design allows us to access quantum transport of the spin-textured surface electrons, manifesting a spin-Berry's phase via 1D helical modes.

The second part will be focused on the crystalline order of complex oxides (SrTiO3) in the 2D limit. Atomically controlled oxide layers are released by dissolving an underlying epitaxial layer, where we observe that the lattice collapses below a critical thickness (5 unit cells). This crossover from algebraic to exponential decay of the crystalline coherence length reflects the 2D topological Berezinskii-Kosterlitz-Thouless (BKT) transition, driven by chemical bond breaking at the 2D layer - 3D bulk interface.

 

Contact: SunYoung Choi, (sunyoungchoi@kaist.ac.kr)

 

Center for Quantum Coherence in Condensed Matter, KAIST

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)
474 2017-09-26 11:00    Time-resolved ARPES study of Dirac and topological materials
473 2017-10-10 16:00    Discovery of New 2D Materials with Diverse Physical Properties
472 2017-11-03 14:30    Quantum Resistor-Capacitor Circuit with Majorana Edge States file
471 2017-11-03 16:00    Expedition to the Kitaev Quantum Spin Liquid: Hunting for Majorana fermions file
470 2017-11-08 13:00    “Emergent exotic quasiparticles in quantum spin liquids” file
469 2017-11-28 16:00    Physics after the lab and the desk: Your work in PRL file
468 2017-12-13 13:30    KAIST-KIAS Joint Workshop in Theoretical Sciences 개최 file
467 2017-12-14 15:00    Exploring the Universe via GWs in the era of multi-messenger astronomy
466 2017-12-15 09:20    Workshop on Magnetism in Unconventional Superconductors 개최 file
465 2018-02-12 15:00    The recent result of XMASS Experiment
464 2018-03-16 14:30    산화물 다층박막에서의 다양한 물리현상 file
463 2018-03-16 16:00    Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics file
462 2018-04-06 10:00    Entanglement and thermalization in many-body systems: recent progress file
461 2018-04-09 11:00    Doublon-holon origin of the subpeaks at the Hubbard band edges file
460 2018-04-11 13:30    Probing 3D Structure and Physical Properties of Materials at the Single-Atom Level file
459 2018-04-11 16:00    Non-Gaussian states of multimode light generated via hybrid quantum information processing file
458 2018-04-13 10:00    Quantum meets Mechanics: from Quantum Information to Fundamental Research file
457 2018-05-09 16:00    Recent advances in thermoelectric bulk composites file
456 2018-05-11 14:30    Disordered Floquet topological insulators file
455 2018-05-11 16:00    암페어 단위 재정의와 단전자 펌프 소자 개발 file