Phonon-driven spin-Floquet valleytro-magnetism
2017.08.15 22:52
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)
댓글 0
번호 | 날짜 | 장소 | 제목 |
---|---|---|---|
445 | 2015-03-04 12:00 | 1323호, E6-2 |
Bioimaging and Biosensing Using Near-Infrared Fluorescence
![]() |
444 | 2016-12-12 13:30 | 1:30p.m. #1323(E6-2. 1st fl.) | “Possible symmetry in the phase diagrams of electron- & hole-doped cuprate high-Tc superconductors” |
443 | 2016-10-18 13:30 | 1st fl. #1323(E6-2) | "Visualization of oxygen vacancy in motion and the interplay with electronic conduction" |
442 | 2019-07-10 16:00 | Academic Cltural Complex (E9) 5층 스카이라운지 |
Public Lectures
![]() |
441 | 2015-08-04 11:00 | B501, Room Red, KI bldg. 5nd fl. | Propagation of ultrasound through two- and three-dimensional strongly scattering media |
440 | 2016-06-01 10:30 | BK21 Conference Room (#1318, E6-2) | Welcome to Nature Photonics |
439 | 2020-10-15 16:00 | CAPP Seminar Room #C303, Creation Hall (3F), KAIST Munji Campus |
Graphene-based Josephson junction microwave bolometer
![]() |
438 | 2023-09-14 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus |
[CAPP seminar] Dark matter searches in Water Cherenkov Detectors
![]() |
437 | 2023-09-18 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus |
[CAPP Seminar] Searching for axions in quantum vacuum birefringence
![]() |
436 | 2023-10-11 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus |
[CAPP seminar] Particle Physics with Neutrinos
![]() |
435 | 2023-06-14 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus |
[CAPP seminar] EMC at CERN
![]() |
434 | 2023-05-15 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus |
Role of dark Higgs boson in DM physics and cosmology
![]() |
433 | 2023-09-21 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus |
[CAPP seminar] Axion Magnetic Resonance
![]() |
432 | 2024-01-25 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus | [CAPP seminars] Detecting Gravitational Waves by Elecromagnetic Cavity |
431 | 2023-03-30 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus |
Detecting axions with chiral magnetic effects
![]() |
430 | 2023-03-27 15:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus |
A coherent mechanical oscillator pumped by a suspended quantum dot
![]() |
429 | 2023-06-22 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus |
[CAPP Seminar] The muon g-2 puzzle
![]() |
428 | 2023-07-26 10:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus | [CAPP Seminar] Am Expansive Search for Dark Matter with ADMX and DM Radio |
427 | 2023-06-15 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus |
[CAPP Seminar] Cryogenic electronics for ion traps
![]() |
426 | 2023-12-14 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus |
Superconducting qubits for large-scale quantum computers
![]() |