visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

Non-Hermitian Casimir Effect of Magnons

2023.07.17 16:50

admin 조회 수:345

날짜 2023-07-18 11:00 
일시 July 18(Tue), 11:00AM 
장소 E6-2, #1323 
연사 Dr. Kouki Nakata (Advanced Science Research Center, Japan Atomic Energy Agency) 
Dr. Kouki Nakata (Japan Atomic Energy Agency)을 모시고 'Non-Hermitian Casimir Effect of Magnons' 주제에 대한 세미나를 개최하고자 합니다. 
물리학과 구성원 여러분들의 많은 참여 부탁드립니다.
-------------------------------------------------------------------------------------------------------------------------------------
1) Time
    - at 11:00 on July 18, 2023 
2) Venue
    - E6, Rm#1323
3) Speaker
    - Dr. Kouki Nakata (Advanced Science Research Center, Japan Atomic Energy Agency)
4) Talk Title
    - Non-Hermitian Casimir Effect of Magnons
5) Abstract
   - Recently, there has been a growing interest in non-Hermitian quantum mechanics [1]. The key concepts of quantum mechanics are quantum fluctuations. Quantum fluctuations of quantum fields confined in a finite-size system induce the zero-point energy shift. This quantum phenomenon, the Casimir effect [2], is one of the most striking phenomena of quantum mechanics in the sense that there are no classical analogs and has been drawing much attention from various research areas, including high energy physics, beyond the hierarchy of energy scales. However, the non-Hermitian extension of the Casimir effect and the application to spintronics [3] remain missing ingredients. Here we fill this gap. By developing a magnonic analog [4] of the Casimir effect into non-Hermitian systems [5], we show that this non-Hermitian Casimir effect of magnons [6] is enhanced as the Gilbert damping constant (i.e., the energy dissipation rate) increases. When the damping constant exceeds a critical value, the non-Hermitian Casimir effect of magnons exhibits an oscillating behavior, including a beating one, as a function of the film thickness and is characterized by the exceptional point. Our result suggests that energy dissipation serves as a key ingredient of Casimir engineering [7].
 
References:
[1] Y. Ashida et al., Adv. Phys. 69, 249 (2020).
[2] H. B. G. Casimir, Proc. Kon. Ned. Akad. Wetensch. 51, 793 (1948).
[3] H. Yuan et al., Phys. Rep. 965, 1 (2022).
[4] KN and K. Suzuki, Phys. Rev. Lett. 130, 096702 (2023).
[5] K. Lee et al., Nat. Nanotechnol. 16, 1337 (2021); Y. Tserkovnyak, Phys. Rev. Res. 2, 013031 (2020).
[6] KN and K. Suzuki, arXiv:2305.09231 (2023).
[7] T. Gong et al., Nanophotonics 10, 523 (2021).
번호 날짜 장소 제목
259 2023-12-19 16:00  E6-2, #1323  [High Energy Theory Seminar] Non-invertible symmetries, leptons, quarks, and why multiple generations
» 2023-07-18 11:00  E6-2, #1323  Non-Hermitian Casimir Effect of Magnons
257 2023-07-19 16:00  E6-2, #1323  [High-Energy Theory Seminar]Deriving the Simplest Gauge-String Duality
256 2023-07-12 11:00  E6-2, #1323  Study of spin-1/2 antiferromagnetic kagome Heisenberg model by symmetric projected entangled simplex states
255 2023-07-11 11:00  E6-2, #1323  Ordered phases, non-Fermi liquid, and quantum criticality driven by entanglement between multipoles and conduction electrons
254 2023-06-08 16:00  E6-2, #1323  Thermal decoupling in high-Tc cuprate superconductors
253 2022-09-15 13:00  E6-2, #1323  AdS black holes: a review
252 2019-07-31 16:00  E6-2, #1323  Features of ballistic superconducting graphene file
251 2019-07-25 16:00  E6-2, #1323  Band topology of twisted bilayer graphene file
250 2019-06-24 11:00  E6-2, #1323  Topological photonic anomalies file
249 2016-09-29 16:00  E6-2, #1323  2016 Fall, Physics Seminar Serises file
248 2016-01-26 14:00  E6-2, #1323  Electrochemistry on Nano- and Atomic Levels: Scanning Probe Microscopy Meets Deep Data
247 2016-01-11 16:00  E6-2, #1323  Mott Physics in the Strong Spin-Orbit Coupling Regime
246 2015-12-11 15:45  E6-2, #1323  Dynamical mean field theory studies on heavy fermion system
245 2015-12-11 13:30  E6-2, #1323  Quantum spin liquid in the 1/3 depleted triangular lattice Ba3(Ru1-xIrx)Ti2O9
244 2015-12-09 14:00  E6-2, #1323  SWELLABLE COLLOIDAL PARTICLES ARE SWELL
243 2015-12-03 16:00  E6-2, #1323  Hybrid solid state spin qubits in wide bandgap semiconductors
242 2015-12-02 16:00  E6-2, #1323  Samarium Hexaboride: Is it a Topological insulator?
241 2015-12-01 16:00  E6-2, #1323  Introducing extra dimensions to spectroscopic studies of advanced quantum materials
240 2015-11-28 10:00  E6-2, #1323  Electron Tunneling Spectroscopy of Single and Bilayer Graphene with Hexagonal Boron Nitride as Tunneling Barrier