장소 | E6-2. 1st fl. #1501 |
---|---|
일시 | 2016/03/11 4 PM |
연사 | Dr. Tae-Hwan KIM (POSTECH) |
Jan. Switching handedness of of chiral solitons in Z4 topological insulators
Dr. Tae-Hwan KIM (POSTECH)
Mar. 11 (Fri.), 4:00 PM, E6-2. 1st fl. #1501
Chirality is a ubiquitous and interesting phenomenon in fields ranging from biology, chemistry to physics. In condensed matter, chirality can be topologically protected by the system’s symmetry and thus can be used to carry information robustly against external perturbations. For instance, magnetic skyrmions have been investigated intensively as topological information carriers for next generation spintronic devices. However, logic operations using topological excitations are only conceptually proposed. On the other hand, chiral solitons are recently discovered as the topologically protected edge states of one-dimensional Z4 topological insulators [1,2], which can be exploited as topological information carriers in electronic system. In this talk, I show experimentally and directly that switching between solitons with different chirality is possible by merging them with achiral soliton [3]. This switching corresponds to the realization of topological addition of the Z4 topological number. With their distinct topologically protected chirality, chiral solitons could uniquely be exploited for robust multilevel information storage and logic operation by storing, carrying, and switching three differently topological bits of information.
[1] T.-H. Kim and H. W. Yeom, Phys. Rev. Lett. 109, 246802 (2012).
[2] S. Cheon, T.-H. Kim, S.-H. Lee, and H. W. Yeom, Science 350, 182 (2015).
[3] T.-H. Kim et al. to be submitted
Contact: Heung Sun Sim, Physics Dept., (hs_sim@kaist.ac.kr)
댓글 0
번호 | 일시 | 장소 | 연사 | 제목 |
---|---|---|---|---|
356 | 4. 4(월), 16:00 | E6, #1501 | 김희철교수 (Postech 물리학과) | New paradigms in Quantum Field Theory |
355 | 5. 9(월),16:00 | E6, #1501 | 김창영교수 (서울대) | Searching for new electronic properties in correlated material flatland |
354 | 5. 23(월),16:00 | E6, #1501 | 김준성교수 (postech 물리학과) | Novel electronic transport in topological van der Waals magnets |
353 | 2011/09/03-12/06 | E6, 1501 | 김용균교수(한양대) 외 |
Physics Colloquium : 2011 Fall
![]() |
352 | Nov. 12 (Thu.) 4:00 PM | E6-2 1323 | 김영덕 (Young Duck Kim) 교수 | 2020 가을학기 광학분야 특별세미나 |
351 | Oct. 10(Tue) 4PM | E6-2 #1323 | 김성웅 교수 (성균관대학교 에너지과학과) | Discovery of New 2D Materials with Diverse Physical Properties |
350 | 2. 28(월),16:00 | E6, #1501 | 김동규교수 (KAIST 물리학과) | Spin-based training of optical microscopes |
349 | 4pm, 10th May | E6 1323 | 권혁준 (Korea Institute for Advanced Study, KIAS) | (광학분야 특별세미나)Testing quantum thermodynamics using quantum optics |
348 | 5. 30(월), 16:00 | E6, #1501 | 공수현교수 (고려대학교 물리학과) | Light manipulation using 2D layered semiconductors |
347 | 2013/03/11-06/10 | E6, 1501 | 강명수교수(KAIST) 외 | Physics Colloquium : 2013 Spring |
346 | Jan. 18(Tue), 2pm-3pm | KI bldg. 5th fl. Room B501 & Zoom | YoungJu Jo (Stanford University) |
Data-driven interrogation of biological dynamics: from subcellular interactions to neuronal networks in vivo
![]() |
345 | Jun. 14 (Tue) 4PM | Seminar Room (#2502, 2nd fl.) | Young-Sik Ra, Université Pierre et Marie Curie | Photonic quantum network based on multimode squeezed vacuums and single-photon subtraction |
344 | Feb.15(Mon), 05:00PM | Zoom | Yoshichika Otani(Tokyo Univ.) |
Magnetic Cluster Octupole Domain evolutation in chiral antiferromagnets
![]() |
343 | 2012/04/02, 4PM | E6, 1501 | Yong Hee Jeong | A new route to ferroelectricity in magnetic spinels: a case of Co2MnO4 |
342 | Dec.10(Thu), 01:55 PM | Zoom | Yin Wen (University of Tokyo) | Consistency of Boltzmann equation and light dark matter from inflaton decay |
341 | 2016/09/05-12/12 4PM | Natual Scien Bldg.(E6)m #1501 | Yeong Kwan Kim 외 |
Physics Colloquium : 2016 Fall
![]() |
340 | Jan.28(Thu), 03:00PM | Zoom | Yaroslav Tserkovnyak (UCLA) |
Topological Transport of Deconfined Hedgehogs in Magnets
![]() |
339 | DEC. 26 (Wed), 04:00 PM | E6-1. 3rd fl. #3434 | Y. Kim, A. Go, K. Hwang and E.-G. Moon |
Informal Workshop on Topology and Correlation
![]() |
338 | Jun 22(Tue) 17:00 | Zoom webinar | Wei Han (Peking University, China) |
Spintronics meets Quantum Materials
![]() |
337 | Jun 8 (Tue), 10:00 AM | Zoom webinar | Toshihiko Baba (Yokohama National University, Japan) |
Photonic crystal devices for sensing
![]() |