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
248 2020-10-16 14:30  https://kaist.zoom.us/j/89198078609  Nanoscale magnetic resonance detection towards nano MRI file
247 2020-10-16 16:00  https://kaist.zoom.us/j/89198078609  Hidden room-temperature ferroelectricity in CaTiO3 revealed by a metastable octahedral rotation pattern file
246 2020-10-23 14:00  E6-2 #1323  Plasmon spectroscopy of low-dimensional superconductors in fluctuating regime file
245 2020-11-12 16:00  E6-2 1323  2020 가을학기 광학분야 특별세미나
244 2020-11-17 12:00  Online(Zoom)  Quantum- & Nano-Photonics" 세미나 시리즈 file
243 2020-11-20 14:30  Online  Lumpy Cooper pairs in an iron-based superconductor
242 2020-11-20 16:00  Online  Coherent control of field gradient induced quantum dot spin qubits
241 2020-11-26 16:00  Online(Zoom)  2020 가을학기 광학분야 특별세미나(Light Engineering Beyond the Diffraction Limit)
240 2020-12-02 10:00  Zoom  Recent progress in Axion Dark Matter eXperiment (ADMX) technology file
239 2020-12-09 10:00  Zoom  Searching for the QCD axion with the ARIADNE experiment file
238 2020-12-10 13:55  Zoom  Consistency of Boltzmann equation and light dark matter from inflaton decay
237 2020-12-11 14:30  online  Antisymmetric interlayer exchange coupling in magnetic multilayers
236 2020-12-11 16:00  online  Atomic and electronic reconstruction at van der Waals interface in twisted 2D materials
235 2020-12-23 10:00  Online  Online workshop for Quantitative Phase Imaging file
234 2021-01-28 15:00  Zoom  Topological Transport of Deconfined Hedgehogs in Magnets file
233 2021-01-28 18:00  Online Seminar  Quantum metamaterials: concept, theory, prototypes and possible applications file
232 2021-02-02 14:30  Zoom  Quantum- & Nano-Photonics 세미나(Integrated Nanophotonics with Metamaterials, Microcomb, and Atomic Systems) file
231 2021-02-15 17:00  Zoom  Magnetic Cluster Octupole Domain evolutation in chiral antiferromagnets file
230 2021-02-17 09:00  Online  석학 대중 강연 및 강의 시리즈 file
229 2021-03-02 16:00  Online  Sensitive terahertz detection with graphene-based transistors file