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)
354 2019-09-27 14:30    Spin-charge conversion in topological insulators for spintronic applications file
353 2019-09-27 16:00    0D/1D/2D/3D III-V materials grown by MBE for Optelectronics file
352 2019-10-15 16:00    Moiré superlattices and graphene quasicrystal file
351 2019-10-16 16:00    Emergent black holes and monopoles from quantum fields file
350 2019-10-17 16:00    Top down manipulation of Waves : From Metamaterials, Correlated Disorder, Quantum Analogy, to Digital Processing file
349 2019-10-25 15:00    Physics Seminar file
348 2019-10-29 10:00    Unconventional Spin Transport in Quantum Materials file
347 2019-10-29 14:30    Quantum sensing file
346 2019-10-29 16:00    Particles and Gravity via String Geometry file
345 2019-10-31 10:00    Kondo meets Hubbard: Impurity physics for correlated lattices file
344 2019-11-01 14:30    Squeezing the best out of 2D materials file
343 2019-11-01 16:00    Electron transport through weak-bonded contact metal with low dimensional nano-material file
342 2019-11-05 16:00    Study on nanomaterials by the development of ultrahigh resolution laser-photoelectron microscopy (PEEM) file
341 2019-11-07 16:00    Integrated quantum photonics with solid-state quantum emitters file
340 2019-11-14 16:00    Semi-classical model of polariton propagation file
339 2019-11-20 16:00    Correlation between superconducting transition temperature and critical current density in irradiated iron-based superconductors file
338 2019-11-28 16:00    Generation of coherent EUV emissions using ultrashort laser pulses file
337 2019-12-03 16:00    Toward Quantum Materials with Correlated Oxides file
336 2019-12-05 16:00    Subwavelenth Photonic Devices: From Single Photon Sources to Solar Cell file
335 2019-12-13 13:00    Computational Material Designs: Current Status and Future Directions file