visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2017-08-16 16:00 
일시 Aug. 16 (Wed.), 4 PM 
장소 #1322 (E6-2. 1st fl.) 
연사 Prof. Noejung Park (UNIST) 

“Phonon-driven spin-Floquet valleytro-magnetism”

 

Prof. Noejung Park (UNIST)

Aug. 16 (Wed.), 4 PM 

#1322 (E6-2. 1st fl.)

 

 

The family of two-dimensional (2D) materials equipped with strong spin-orbit coupling (SOC) display novel properties originating from the broken time- or inversion symmetry, and their spin-valley structures can be adopted as an encoding mechanism for binary information. Here, by performing ab initio real-time time dependent density functional simulation on MoS2, the prototypical 2D material, we show that the spin is not only locked to the valley-momenta but strongly coupled to the optical phonon that lifts the mirror symmetry. This dynamical spin state can be resolved into discrete Floquet-phononic spectra, featured by pairs of Larmor precessions. Once the phonon is pumped so as to break time-reversal symmetry, the resulting spin-Floquet structures induce net out-of-plane magnetizations in the otherwise non-magnetic 2D material. This phonon-dressed spin state is an intrinsic excitation of SOC systems that can be controlled by infrared coherent laser excitation, which opens a new avenue toward dynamical spin manipulation.

 

 

Contact: MyungJoon Han, Physics Dept., (mj.han@kaist.ac.kr)

 

번호 날짜 장소 제목
211 2021-03-25 16:00  Online Seminar (Zoom)  Search for dark matter axion with Rydberg atoms file
210 2021-04-02 14:30  Online(Zoom)  Quantum computing and entanglement generation using trapped ions and photons
209 2021-04-02 16:00  Online(Zoom)  Van der Waals heterostructures for orbital gating-based phototransistors and electronic spectroscopy
208 2021-04-09 10:00  Zoom webinar  Integrated Lithium Niobate Photonics file
207 2021-04-19 19:00  Zoom webinar  Evidence of Electrical Switching in Antiferromagnets and Coherent Spin Pumping file
206 2021-05-14 14:30  Online seminar  Electrically tunable spin valve effect in vertical van-der-Waals magnetic tunnel junctions file
205 2021-05-14 16:00  Online seminar  Spatial and temporal separation of environmental dephasing sources from solid-state quantum emitters file
204 2021-05-17 17:00  Zoom webinar  Spin current generation and detection in uniaxial antiferromagnets file
203 2021-05-27 16:00  온라인  찾아가는 물리연구 현장(유럽 입자물리학연구소 소개) file
202 2021-06-08 10:00  Zoom webinar  Photonic crystal devices for sensing file
201 2021-06-11 14:30  Online seminar  Engineering sound waves and vibrations in multi-mode nanomechanical systems file
200 2021-06-11 16:00  Online seminar  Pseudogap in surface-doped black phosphorus file
199 2021-06-22 17:00  Zoom webinar  Spintronics meets Quantum Materials file
198 2021-07-29 14:00  Online seminar  Gravitationally Induced Dark Sector and Inflationary Dynamics file
197 2021-11-02 16:00  자연과학동(E6-2) #1323  Metrology of Band Topology via Resonant Inelastic X-ray Scattering file
196 2021-12-03 14:30  Zoom webinar  Topological Spin Textures: Skyrmions and Beyond file
195 2021-12-03 16:00  Zoom webinar  Nonequilibrium Heat Transport in Elemental Metals Probed by an Ultrathin Magnetic Thermometer file
194 2022-01-11 15:00  E6 #1501  Ultrafast optical studies on CDW collective modes of the Weyl-CDW (TaSe4)2I file
193 2022-01-12 11:00  Zoom and E6 #1323  Spectroscopic study of trapped ions towards probing dark matter and new physics file
192 2022-01-17 14:00  E6-2 Room 2502  Five Lectures on Observational Probes of Dark Energy file