visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

Optical Response in the multilayer thin films

2023.05.09 15:55

admin 조회 수:663

날짜 2023-05-17 14:00 
일시 May (Wed) 17th, 2pm 
장소 E6 #1323 
연사 YOSHII MAO (Applied physics department, University of Tokyo) 
물리학과 이성빈 교수 연구실에서 세미나를 아래와 같이 안내 드리오니
관심있는 분의 많은 참석 바랍니다.
 
Date: 2pm, 17th May (Wed)
 
Place: E6 #1323
 
Speaker: YOSHII MAO ( Ph.D. student, Applied physics department, University of Tokyo)
 
Title: Optical Response in the multilayer thin films
 
Abstract: 

After the fabrication of the graphene sheet at the beginning of this century, multilayer thin films are attracting huge attention. Since we can control the property by stacking and deforming the layers, these systems are regarded as a new platform for material design. 

In contrast to the interest, these systems lack periodicity in general. As solid state physics today relies heavily on translational symmetry, this hinders us from using the conventional picture in the wave number space and makes the theoretical analysis difficult. However, in the multilayer system, we can also use the wave number space as an approximation. When we stack layers, the layers are coupled through the Van der Waals interaction. As this interaction is very weak and we can treat it as a perturbation for the periodic systems. Through this approximation, we can construct a moiré Hamiltonian and use the wave number space.
 In this talk, I begin with a review of the moiré Hamiltonian approach, and after that, explain the analysis of the second-order optical response[1-2].

 

[1] T. Akamatsu, T. Ideue, S. Kitamura, M. Yoshii, T. Morimoto, Y. Iwasa, et al., Science372, 6537, pp. 68-72 (2021)

[2] Y. Dong, M. M. Yang, M. Yoshii, Y. Iwasa, et al., Nature Nanotechnology (2022)
 
번호 날짜 장소 제목
484 2020-01-17 16:00  #1323, E6-2  Symmetry Breaking and Topology in Superfluid 3He file
483 2019-06-28 13:30  #1323, E6-2  Magnetic domains and domain wall conduction in pyrochlore iridate thin films and heterostructures file
482 2019-05-02 16:00  #1323, E6-2  Anomalous optical properties of halide perovskites file
481 2019-09-18 16:00  Seminar Room #1323  Fall 2019: Physics Seminar Serises file
480 2016-10-17 11:00  #1323,(E6-2, 1st fl.)  IMS and examples of the studies on optoelectronic materials
479 2019-09-02 16:00  Seminar Room 1501  Fall 2019: Physics Colloquium file
478 2016-04-28 15:00  #2501(E6-2. 2nd fl.)  Lattice/Spin/Charge Coupling in 5d Pyrochlore Cd2Os2O7
477 2019-12-13 13:00  #2501, E6-2  Computational Material Designs: Current Status and Future Directions file
476 2018-04-06 10:00  #2502, E6  Entanglement and thermalization in many-body systems: recent progress file
475 2019-06-27 14:00  #2502, E6-2  Gapless Kitaev Spin Liquid to Loop and String Gases file
474 2019-09-10 15:00  #2502, E6-2  (2+1) D Duality Web from 3D Euclidean Lattice file
473 2019-11-20 16:00  #5302, E6-2  Correlation between superconducting transition temperature and critical current density in irradiated iron-based superconductors file
472 2019-02-21 16:00  #5313, E6-2  B-meson charged current anomalies - Theoretical status file
471 2017-11-08 13:00  #5318 (E6-2. 5th fl.)  “Emergent exotic quasiparticles in quantum spin liquids” file
470 2016-11-18 10:30  #5318(5th fl.)  Non-equilibrium many-body spin dynamics in diamond
469 2017-08-31 14:00  #5318(E6-2. 5th fl.)  “Berry phase and nonlinear response: photocurrent in noncentrosymmetric insulators and Weyl semimetals” file
468 2019-12-27 15:00  #5318, E6-2  The superconducting order parameter puzzle of Sr2RuO4 file
467 2019-05-21 16:00  #5318, E6-2  Classification of flat bands according to the band-crossing singularity of Bloch wave functions file
466 2018-02-12 15:00  #C303, (Creation Hall 3F, KAIST Munji Campus)  The recent result of XMASS Experiment
465 2020-10-15 16:00  (https://kaist.zoom.us/j/93997220310)  Towards resource-efficient and fault-tolerant quantum computation with nonclassical light