visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2022-09-23 11:00 
연사  
장소 E6-2 #1323 
세미나 영상은 아래 링크로 확인하시기 바랍니다. (공개기한: 2023.09.22.까지)
 
o Date / Time : Sep. 23.  2022, 11:00 AM
o Place : Room 1323, KAIST Natural Sciences Lecture Hall(E6) (자연과학동 1323호)
o Zoom Link : https://kaist.zoom.us/j/86450686082   회의 ID: 864 5068 6082
 
Speaker : Prof. Gil-Ho Lee (Department of Physics, Pohang University)
Talk Title :  Steady Floquet–Andreev states in graphene Josephson junctions
Abstract
Engineering quantum states through light-matter interaction has created a new paradigm in condensed matter physics. A representative example is the Floquet-Bloch state, which is generated by time-periodically driving the Bloch wavefunctions in crystals. Previous attempts to realise such states in condensed matter systems have been limited by the transient nature of the Floquet states produced by optical pulses, which masks the universal properties of non-equilibrium physics. Here, we report the generation of steady Floquet Andreev (F-A) states in graphene Josephson junctions by continuous microwave application and direct measurement of their spectra by superconducting tunnelling spectroscopy [1]. We present quantitative analysis of the spectral characteristics of the F-A states while varying the phase difference of superconductors, temperature, microwave frequency and power. The oscillations of the F-A state spectrum with phase difference agreed with our theoretical calculations. Moreover, we confirmed the steady nature of the F-A states by establishing a sum rule of tunnelling conductance, and analysed the spectral density of Floquet states depending on Floquet interaction strength. This study provides a basis for understanding and engineering non-equilibrium quantum states in nano-devices.
Attached: C.V
 
Inquiry: Prof. Se Kwon Kim(sekwonkim@kaist.ac.kr) / Prof. Hee Jun Yang (h.yang@kaist.ac.kr)
번호 날짜 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
385 2023-09-18 16:00    [CAPP Seminar] Searching for axions in quantum vacuum birefringence file
384 2022-11-24 16:00    Probing fundamental physics by mapping the mm and sub-mm sky
383 2016-10-07 13:30    “Symmetry and topology in transition metal dichalcogenide?”
382 2022-10-26 10:00    Replica Higher-Order Topology of Hofstadter Butterflies in Twisted Bilayer Graphene
381 2016-11-29 16:00    Symmetry Protected Kondo Metals and Their Phase Transitions
380 2017-11-03 16:00    Expedition to the Kitaev Quantum Spin Liquid: Hunting for Majorana fermions file
379 2022-07-14 15:00    Pure two-dimensional quantum electron liquid and its phase transition
378 2022-09-30 14:30    Putting a spin on the Josephson effect file
377 2018-04-13 10:00    Quantum meets Mechanics: from Quantum Information to Fundamental Research file
376 2019-05-01 16:00    Raman and x-ray scattering study on correlated electron systems: two case examples file
375 2022-05-25 16:00    Uncovering New Lampposts for Dark Matter: Continuum or Conformal
374 2022-05-11 16:00    Gravity as a phenomenon in quantum dynamics
373 2015-11-28 10:00    Electron Tunneling Spectroscopy of Single and Bilayer Graphene with Hexagonal Boron Nitride as Tunneling Barrier
372 2021-05-14 14:30    Electrically tunable spin valve effect in vertical van-der-Waals magnetic tunnel junctions file
371 2021-04-02 14:30    Quantum computing and entanglement generation using trapped ions and photons
370 2016-03-11 16:00    Jan. Switching handedness of of chiral solitons in Z4 topological insulators
369 2023-09-26 16:00    [High Energy Theory Seminar]A new step in interacting dark sector cosmologies
368 2019-03-29 16:00    Coherent Quantum Control and Magnetism on atoms – Trapped ion and ESR STM file
367 2025-05-28 16:00  Dr. Thiago L. M. Guedes (Forschungszentrum Jülich)  Computing the graph-changing dynamics of loop quantum gravity file
366 2018-06-18 10:00    Rydberg electromagnetically induced transparency and microwave-to-optical conversion using Rydberg atoms file