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
519 2016-07-08 11:00  #1323(E6-2. 1st fl.)  Isostatic magnetism
518 2016-11-11 13:30  #1323(E6-2. 1st fl.)  Bandgap Engineering of Black Phosphorus
517 2016-07-07 14:00  #1323(E6-2. 1st fl.)  Let there be topological superconductors
516 2017-02-01 14:00  #1323(E6-2. 1st fl.)  Quantum electron optics using flying electrons
515 2016-11-16 16:00  #1323(E6-2. 1st fl.)  Realizing Haldane Model in Fe-based Honeycomb Ferromagnetic Insulators
514 2018-10-19 10:00  #1323, E6-2  Energy conversion processes during magnetic reconnection in a laboratory plasma file
513 2018-05-31 16:00  #1323, E6-2  Dynamic control of optical properties with gated-graphene metamaterials file
512 2018-10-04 16:00  #1323, E6-2  Engineering light absorption in an ultrathin semiconductor metafilm file
511 2019-12-05 16:00  #1323, E6-2  Subwavelenth Photonic Devices: From Single Photon Sources to Solar Cell file
510 2019-10-15 16:00  #1323, E6-2  Moiré superlattices and graphene quasicrystal file
509 2018-10-16 10:00  #1323, E6-2  Capturing protein cluster dynamics and gene expression output in live cells file
508 2019-11-05 16:00  #1323, E6-2  Study on nanomaterials by the development of ultrahigh resolution laser-photoelectron microscopy (PEEM) file
507 2018-11-01 16:00  #1323, E6-2  Direct holography from a single snapshot file
506 2018-11-21 15:00  #1323, E6-2  Engineering topological quantum physics at the atomic scale file
505 2019-12-18 16:00  #1323, E6-2  Road to Higher Tc Superconductivity file
504 2018-05-09 16:00  #1323, E6-2  Recent advances in thermoelectric bulk composites file
503 2018-10-11 16:00  #1323, E6-2  Dirac electrons in a graphene quasicrystal file
502 2019-09-18 16:00  #1323, E6-2  Exploring Synthetic Quantum Matter in Superconducting Circuits file
501 2019-10-25 15:00  #1323, E6-2  Physics Seminar file
500 2018-10-15 16:00  #1323, E6-2  Universal properties of macroscopic current-carrying systems file