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 |
---|---|---|---|---|
공지 | 2019/09/18 - 12/5 | Seminar Room #1323 | Prof. David Schuster and etc. | Fall 2019: Physics Seminar Serises |
공지 | 2019/09/02 - 12/09 | Seminar Room 1501 | 이호성 박사 (한국표준과학연구원) and etc. | Fall 2019: Physics Colloquium |
190 | December 2(Wed), 10:00AM | Zoom | Prof. Rakshya Katiwada (Illinois Institute of Technology) |
Recent progress in Axion Dark Matter eXperiment (ADMX) technology
![]() |
189 | December 27(Fri.), 15:00 | E6-2,#5318 | Han Gyeol Suh |
The superconducting order parameter puzzle of Sr2RuO4
![]() |
188 | December 3 (Tue.), 4:00 PM | #1323, E6-2 | Dr. Jong Mok Ok |
Toward Quantum Materials with Correlated Oxides
![]() |
187 | December 5 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Soon-Hong Kwon |
Subwavelenth Photonic Devices: From Single Photon Sources to Solar Cell
![]() |
186 | Feb. 1 (Wed.), 2p.m. | #1323(E6-2. 1st fl.) | Dr. Michihisa Yamamoto, Department of Applied Physics, The University of Tokyo | Quantum electron optics using flying electrons |
185 | Feb. 12 (Mon), 3:00pm | #C303, (Creation Hall 3F, KAIST Munji Campus) | Dr. Byeongsu Yang, Kamioka Observatory, Univ. of Tokyo | The recent result of XMASS Experiment |
184 | Feb. 2(Tue) 2:30 PM | Zoom | Prof. Sangsik Kim (Texas Tech University, USA) |
Quantum- & Nano-Photonics 세미나(Integrated Nanophotonics with Metamaterials, Microcomb, and Atomic Systems)
![]() |
183 | Feb. 25 - Jun 3 | Rm. 1501 (E6) |
Spring 2019: Physics Colloquium
![]() | |
182 | Feb.15(Mon), 05:00PM | Zoom | Yoshichika Otani(Tokyo Univ.) |
Magnetic Cluster Octupole Domain evolutation in chiral antiferromagnets
![]() |
181 | Feb.17(Wed)~19(Fri), 09:00~11:00AM | Online | Prof. Subir Sachdev (Harvard University) |
석학 대중 강연 및 강의 시리즈
![]() |
180 | February 12(Web.) | E6-2, #5318 | Prof. Kunio Kaneta |
From inflation to new weak-scale
![]() |
179 | February 13th (Thur.), 16:30 PM | E6-6, #119 | Dr. Seyoon Kim(University of Wisconsin-Madison) |
Enhanced Light-Matter Interactions in Graphene with Noble Metal Plasmonic Structures
![]() |
178 | February 20 (Thu), 4:00 PM | #1323, E6-2 | Seunghyun Khim |
Unconventional superconductivity in the locally non-centrosymmetric heavy-fermion CeRh2As2
![]() |
177 | February 21 (Thu.), 16:00 PM | #5313, E6-2 | Prof. Diptimoy Ghosh |
B-meson charged current anomalies - Theoretical status
![]() |
176 | JAN. 7 (Mon), 03:00 PM | E6-2. 2st fl. #2501 | Dr. Byoung min Kang |
Many-Body Invariants for Multipoles in Higher-Order Topological Insulators
![]() |
175 | Jan.28(Thu), 03:00PM | Zoom | Yaroslav Tserkovnyak (UCLA) |
Topological Transport of Deconfined Hedgehogs in Magnets
![]() |
174 | Jan.28(Thu), 06:00PM | Online Seminar | Alexandre Zagoskin(Loughborough Univ.) |
Quantum metamaterials: concept, theory, prototypes and possible applications
![]() |
173 | Jan.9 (Wed.), 04:00 PM | E6-2. 2nd fl. #2501 | Dr. Heung-Sik Kim |
Molecular Mott state in the deficient spinel GaV4S8
![]() |
172 | January 17 (Fri), 4:00 PM | #1323, E6-2 | Hiroki Ikegami |
Symmetry Breaking and Topology in Superfluid 3He
![]() |
171 | January 23, 2019 | Rm. C303, Creation Hall (3F), Munji Campus | Mikko Mottonen |
Ultrasensitive Microwave Bolometer: Opportunity for Axion Detectors
![]() |