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)
485 2024-03-20 16:00    [High-Energy Theory Seminar] Black hole states at finite N
484 2024-01-03 11:00    Interplay of Strong Correlations, Topology, and Disorder in 2D Quantum Matters
483 2023-09-13 16:00    [High Energy Theory Seminar] Cosmic Birefringence from Dark Photon
482 2022-06-23 11:00    JILA’s search for the electron’s Electric Dipole Moment (eEDM) to probe physics beyond the standard model file
481 2022-01-11 15:00    Ultrafast optical studies on CDW collective modes of the Weyl-CDW (TaSe4)2I file
480 2024-01-16 14:00    Dimer Physics and Superconductivity in La3Ni2O7
479 2020-02-20 16:00    Unconventional superconductivity in the locally non-centrosymmetric heavy-fermion CeRh2As2 file
478 2023-12-19 16:00    [High Energy Theory Seminar] Non-invertible symmetries, leptons, quarks, and why multiple generations
477 2022-12-13 11:00    Art of thin film engineering toward topological quantum computation file
476 2016-09-29 16:00    2016 Fall, Physics Seminar Serises file
475 2023-01-11 11:00    Directly proving magnetoelastic coupling in a soft ferromagnet using Lorentz 4D-STEM file
474 2021-11-02 16:00    Metrology of Band Topology via Resonant Inelastic X-ray Scattering file
473 2015-07-16 16:00    KAIST Physics Distinguished Lecture
472 2017-11-28 16:00    Physics after the lab and the desk: Your work in PRL file
471 2025-03-11 12:00  Rak-Kyeong Seong (UNIST)  The AI Revolution for Quantum Fields and Strings: A Case Study
470 2022-04-15 11:00    (응집물리 세미나) First-principles studies of polar oxides and their applications file
469 2017-04-27 16:00    반도체 양자점을 이용한 단광자 광원
468 2019-09-18 16:00    Exploring Synthetic Quantum Matter in Superconducting Circuits file
467 2019-07-25 16:00    Band topology of twisted bilayer graphene file
466 2015-10-16 16:00    Fluctuations of entropy production in partially masked electric circuits