Topological phases in low-dimensional quantum materials
2018.05.29 09:53
장소 | E6-2. 1st fl. #1323 |
---|---|
일시 | Jun. 01 (Fri.), 11:00 AM |
연사 | Dr. Seung Sae Hong |
SRC Seminar
“Topological phases in low-dimensional quantum materials”
Department of Applied Physics, Stanford University
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
댓글 0
번호 | 일시 | 장소 | 연사 | 제목 |
---|---|---|---|---|
282 | Nov. 1 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. YoungWook Kim |
Squeezing the best out of 2D materials
![]() |
281 | Sep. 27 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. Joon Sue Lee |
Spin-charge conversion in topological insulators for spintronic applications
![]() |
280 | Sep. 27 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. Jindong Song |
0D/1D/2D/3D III-V materials grown by MBE for Optelectronics
![]() |
279 | Sep. 10 (Tue.), 03:00 PM | E6-2. 1st fl. #1323 | Dr. Mikhail Kiselev |
Two-Stage Kondo Effect
![]() |
278 | Apr. 19 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. YoungWoo Nam |
A family of finite-temperature electronic phase transitions in graphene multilayers
![]() |
277 | Apr. 19 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. Seok Kyun Son |
Graphene and hBN heterostructures
![]() |
276 | Mar. 29 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. Taeyoung Choi |
Coherent Quantum Control and Magnetism on atoms – Trapped ion and ESR STM
![]() |
275 | Mar. 29 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. Seung Hyub Baek |
Epitaxial Multifunctional Oxide Thin Films for Novel Electronics
![]() |
274 | DEC. 27 (Thu), 04:00 PM | E6-2. 1st fl. #1323 | Prof. Na Young Kim |
Quantum Innovation (QuIN) Laboratory
![]() |
273 | Dec. 26 (Wed.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. Isaac H. Kim |
Brane-like defect in 3D toric code
![]() |
272 | DEC. 16~18 (Sun~Tue) | E6-2. 1st fl. #1323 | Prof. Keisuke Totsuka |
Lectures on 2d Conformal Field Theory
![]() |
271 | DEC. 11 (Tue), 04:00 PM | E6-2. 1st fl. #1323 | Prof. Hiroshi Shinaoka |
Natural compact representation of Matsubara Green’s functions: applications to analytic continuation and quantum many-body simulations
![]() |
270 | Dec. 7 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. Joon Ho Jang |
Novel probes of interacting electrons in 2D systems
![]() |
269 | Dec. 7 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. Gyung Min Choi |
Spin generation from heat and light in metals
![]() |
268 | Nov. 9 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. Donghun Lee |
Quantum sensing and imaging with diamond defect centers for nano-scale spin physics
![]() |
267 | Nov. 9 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. Pilkyung Moon |
Moiré superlattices – from twisted bilayer graphene to quasicrystal
![]() |
266 | Oct. 12 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. HyungWoo Lee |
Direct observation of a two-dimensional hole gas at oxide interfaces
![]() |
265 | Oct. 12 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. Daniel Kyungdeock Park |
Quantum Advantage in Learning Parity with Noise
![]() |
» | Jun. 01 (Fri.), 11:00 AM | E6-2. 1st fl. #1323 | Dr. Seung Sae Hong |
Topological phases in low-dimensional quantum materials
![]() |
263 | May. 17 (Thu.), 01:30 PM | E6-2. 1st fl. #1323 | Prof. Yong-Baek Kim University of Toronto |
Quantum Spin Liquid in Kitaev Materials
![]() |