visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

Non-Hermitian Casimir Effect of Magnons

2023.07.17 16:50

admin 조회 수:322

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
508 2015-11-28 10:00  E6-2, #1323  Electron Tunneling Spectroscopy of Single and Bilayer Graphene with Hexagonal Boron Nitride as Tunneling Barrier
507 2015-12-01 16:00  E6-2, #1323  Introducing extra dimensions to spectroscopic studies of advanced quantum materials
506 2015-12-02 16:00  E6-2, #1323  Samarium Hexaboride: Is it a Topological insulator?
505 2015-12-03 16:00  E6-2, #1323  Hybrid solid state spin qubits in wide bandgap semiconductors
504 2015-12-09 11:00  E4(KI Building), Connect room (2nd fl.)  Functional Imaging & Monitoring of Brain & Breast with Diffuse Light
503 2015-12-09 14:00  E6-2, #1323  SWELLABLE COLLOIDAL PARTICLES ARE SWELL
502 2015-12-11 13:30  E6-2, #1323  Quantum spin liquid in the 1/3 depleted triangular lattice Ba3(Ru1-xIrx)Ti2O9
501 2015-12-11 15:45  E6-2, #1323  Dynamical mean field theory studies on heavy fermion system
500 2015-12-17 11:00  E4(KI Building), Matrix Hall (2nd fl.)  Wavefront engineering for in-vivo Deep brain imaging
499 2016-01-11 16:00  E6-2, #1323  Mott Physics in the Strong Spin-Orbit Coupling Regime
498 2016-01-26 14:00  E6-2, #1323  Electrochemistry on Nano- and Atomic Levels: Scanning Probe Microscopy Meets Deep Data
497 2016-03-07 16:00  E6, 1501  Physics Colloquium : 2016 Spring file
496 2016-03-11 13:30  E6-2, 1501 외  Physics Seminar Serises : 2016 Spring file
495 2016-03-11 13:30  E6-2. 1st fl. #1501  Topological phases of matter in nonequilibrium: Topology of the Wannier-Stark ladder
494 2016-03-11 16:00  E6-2. 1st fl. #1501  Jan. Switching handedness of of chiral solitons in Z4 topological insulators
493 2016-04-01 14:30  E6-2. 1st fl. #1501  Interference of single charged particles without a loop and dynamic nonlocality
492 2016-04-01 16:15  E6-2. 1st fl. #1501  Cotunneling drag effect in Coulomb-coupled quantum dots
491 2016-04-04 09:30  KAIST Natural Science Building (E6-2), RM #4314  Radio frequency engineering
490 2016-04-05 16:00  E6-2. 1st fl. #1322  A new impurity solver for multi-orbital systems: adaptive truncation of the Hilbert space
489 2016-04-06 15:30  E6-2, RM #1323  Superconducting Quantum Interference Devices for Precision Detection