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)
394 2022-08-09 14:00    Quantum biology in fluorescent protein: a new model system to study quantum effects in biology file
393 2022-08-08 14:00    Classical Shadow Tomography for Analog Quantum Simulators
392 2022-08-01 10:00    [Update 세미나 영상] James Webb Space Telescope & OTE Commissioning
391 2022-07-21 16:00    Quintessential axions file
390 2022-07-14 15:00    Pure two-dimensional quantum electron liquid and its phase transition
389 2022-07-14 14:15    Hund and electronic correlations in ruthenium-based systems
388 2022-07-14 13:30    Electronic structure and anomalous transport properties of topological materials by first principle calculation
387 2022-06-23 11:00    JILA’s search for the electron’s Electric Dipole Moment (eEDM) to probe physics beyond the standard model file
386 2022-06-10 16:00    Fe5GeTe2의 나선형 자성특성과 자기저항의 전류밀도 의존성 연구 file
385 2022-06-10 14:30    Combinatorial strategy for condensed matter physics: study on rare earth hexaborides thin films file
384 2022-06-10 11:00    Record-quality two-dimensional electron systems file
383 2022-06-03 11:00    (응집물리 세미나) Theoretical Investigation of Exotic Quantum States in Low-dimensional Materials
382 2022-06-03 09:30    (Quantum-&Nano-Photonics Webinar) Seeing glass in a new light: reimagine chalcogenide photonics file
381 2022-05-30 16:00    Light manipulation using 2D layered semiconductors
380 2022-05-27 11:00    Current Status and Future Plans of ADMX file
379 2022-05-26 16:00    (광학분야 특별세미나)Topological photonic devices
378 2022-05-25 16:00    Uncovering New Lampposts for Dark Matter: Continuum or Conformal
377 2022-05-25 14:00    Atomic-level insights into ferroelectric switching and preferred orientation of ultrathin hafnia file
376 2022-05-23 16:00    Novel electronic transport in topological van der Waals magnets
375 2022-05-20 11:00    (응집물리 세미나) Exploration of new polymorphs in van der Waals crystals