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
282 2022-06-03 11:00  E6-2 #1323  (응집물리 세미나) Theoretical Investigation of Exotic Quantum States in Low-dimensional Materials
281 2022-11-03 16:00  E6-2 #1323  (광학분야 세미나) Single-photon emission from low-dimensional materials
280 2023-06-01 16:00  E6-2 #1323  (광학분야 세미나)Quantum sensing using a squeezed light from hot Rb vapor
279 2022-10-28 11:00  E6-2 #1323  [Update 세미나영상] (응집물리 세미나) Machine-Learning-Guided Prediction models and Materials discovery for high Tc cuprates file
278 2022-12-09 11:00  E6-2 #1323  [Update 세미나영상](응집물리 세미나) Single-shot measurements of strongly-correlated artificial molecular levels in semiconductor quantum dots file
277 2023-03-16 16:00  E6-2 #1323  2023 봄학기 광학분야 및 응집물리 특별세미나 전체 일정 file
276 2022-11-25 11:00  E6-2 #1323  [Update 세미나영상](응집물리 세미나) DMFT+ NRG: From models to real materials, from local to nonlocal correlations file
275 2017-10-10 16:00  E6-2 #1323  Discovery of New 2D Materials with Diverse Physical Properties
274 2020-10-23 14:00  E6-2 #1323  Plasmon spectroscopy of low-dimensional superconductors in fluctuating regime file
273 2022-11-24 16:00  E6-2 #1323 & Zoom  Probing fundamental physics by mapping the mm and sub-mm sky
272 2016-09-29 16:00  E6-2 #1323 (1st floor)  Large-scale Silicon Photonic MEMS Switches
271 2023-07-14 11:00  E6-2 #1501  Interfaces engineering of thin film oxides
270 2024-03-20 16:00  E6-2 #2502  [High-Energy Theory Seminar] Black hole states at finite N
269 2024-03-13 16:00  E6-2 #2502  [High-Energy Theory Seminar] The Schwarzschild Black Hole from Perturbation Theory to all Orders
268 2022-10-26 10:00  E6-2 #2502  Replica Higher-Order Topology of Hofstadter Butterflies in Twisted Bilayer Graphene
267 2022-08-08 14:00  E6-2 #2502  Classical Shadow Tomography for Analog Quantum Simulators
266 2020-11-12 16:00  E6-2 1323  2020 가을학기 광학분야 특별세미나
265 2022-01-17 14:00  E6-2 Room 2502  Five Lectures on Observational Probes of Dark Energy file
264 2016-09-02 16:00  E6-2(1st fl) #1323  Quantum Electrical Transport in Topological Insulator Nanowires
263 2016-09-02 14:30  E6-2(1st fl.), #1323  Nanoscale Thermal Physics: Seebeck Effect and Nanoscale Friction