visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2016-03-11 16:00 
연사  
장소 E6-2. 1st fl. #1501 

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)

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)
534 2016-06-16 16:00    Quantum information processing using quantum dots and photonic crystal cavities
533 2016-07-07 14:00    Let there be topological superconductors
532 2016-07-08 11:00    Isostatic magnetism
531 2016-07-08 14:00    Electronic quasiparticles in the quantum dimer model
530 2016-07-28 16:00    Low Dimensional Electrons: On the Road to Hybrid Quantum Systems
529 2016-08-04 14:30    Relational Logic (with applications to Quantum Mechanics, String Theory, Cosmology, Neutrino Oscillations, Statistical Mechanics)
528 2016-09-02 14:30    Nanoscale Thermal Physics: Seebeck Effect and Nanoscale Friction
527 2016-09-02 16:00    Quantum Electrical Transport in Topological Insulator Nanowires
526 2016-09-05 16:00    Physics Colloquium : 2016 Fall file
525 2016-09-21 16:00    Entanglement probe of two-impurity Kondo physics
524 2016-09-22 15:30    Polarized 3He, Polarized Neutrons and New Interactions beyond the Standard Model
523 2016-09-22 15:30    Polarized 3He, Polarized Neutrons and New Interactions beyond the Standard Model
522 2016-09-29 16:00    2016 Fall, Physics Seminar Serises file
521 2016-09-29 16:00    Exploring the phase diagram of BaBiO3: epic voyage of just another bad trip?
520 2016-09-29 16:00    Large-scale Silicon Photonic MEMS Switches
519 2016-10-07 13:30    “Symmetry and topology in transition metal dichalcogenide?”
518 2016-10-07 16:00    “Tilt engineering of 4d and 5d transition metal oxides?”
517 2016-10-17 11:00    IMS and examples of the studies on optoelectronic materials
516 2016-10-18 13:30    "Visualization of oxygen vacancy in motion and the interplay with electronic conduction"
515 2016-10-18 15:00    “Hybrid quantum systems with mechanical oscillators”