visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2022-09-23 11:00 
일시 Sep. 23 (Fri.), 11:00AM 
장소 E6-2 #1323 
연사 이길호(포스텍 물리학과 교수) 
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 장소 제목
506 2013-03-11 16:00  E6, 1501  Physics Colloquium : 2013 Spring
505 2013-09-09 16:00  E6, 1501  Physics Colloquium : 2013 Fall
504 2014-03-10 16:00  E6, 1501  Physics Colloquium : 2014 Spring file
503 2014-05-28 17:00  KI Building, Matrix Hall  부품소재산업이 미래다
502 2014-12-22 14:00  E6, Rm1319  Dynamics of molecular motors: Power stroke vs Brownian ratchet file
501 2015-03-04 12:00  1323호, E6-2  Bioimaging and Biosensing Using Near-Infrared Fluorescence file
500 2015-03-09 16:00  E6, 1501  Physics Colloquium : 2015 Spring file
499 2015-03-13 14:00  Connect Room, KI Bldg.  The 15th Innovative Workshop on Soft/Bio Materials file
498 2015-06-03 12:00  Room 101, E11  The First Wednesday Multidisciplinary Forum file
497 2015-07-15 14:00  E6-2,1323  Electronic and optical properties of titanate-based oxide superlattices
496 2015-07-16 16:00  E6-2, 1318  Next-generation ultrafast laser technology for nonlinear optics and strong-field physics
495 2015-07-16 16:00  E6-2, 1501  KAIST Physics Distinguished Lecture
494 2015-07-23 13:30  E4, B401  Enhanced ZnO based UV photonics and related applications file
493 2015-08-03 10:30  E6-2, #1323 (Seminar Room)  Axion Search
492 2015-08-04 11:00  B501, Room Red, KI bldg. 5nd fl.  Propagation of ultrasound through two- and three-dimensional strongly scattering media
491 2015-09-07 15:00  E6-2. 1st fl. #1318  Advanced Optical Materials and Devices at NRL
490 2015-09-07 16:00  E6, 1501  Physics Colloquium : 2015 Fall file
489 2015-09-14 14:00  E6-2. 2nd fl. #2501  Ultrafast X-ray Studies on Dynamics Matter in Extreme Conditions
488 2015-09-15 16:00  E6, 1501  Physics Colloquium : 2014 Fall file
487 2015-10-14 18:00  KAIST Munji Campus Supex Hall  인터스텔라 영화 속의 물리 file