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 2025-04-29 10:00  Dr. Yeonju Go (Brookhaven National Laboratory)  Exploring the Hottest Matter in the Universe: Quark-Gluon Plasma through Hard Probes and Artificial Intelligence
공지 2025-05-01 16:00  Dr. Inwook Kim (Lawrence Livermore National Laboratory)  BSM Physics Search with Quantum Sensors
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
542 2016-04-08 13:30    Theoretical Overview of Iron-based superconductors and its future
541 2016-04-08 16:00    Spectroscopic studies of iron-based superconductors : what have we learned?
540 2016-04-12 16:00    Confinement of Superconducting Vortices in Magnetic Force Microscopy
539 2016-04-18 15:30    First Principles Approaches for Intermolecular Interactions: From Gas-Phase Dimers to Liquid Water and Molecular Crystal Polymorphism file
538 2016-04-19 14:00    Nonlocal collisional electron transport in partially ionized plasma generation, structure, and stability
537 2016-04-26 16:00    Transport spectroscopy for electronic bands in carbon-based nanomaterials with weak-bond contacts
536 2016-04-28 15:00    Lattice/Spin/Charge Coupling in 5d Pyrochlore Cd2Os2O7
535 2016-05-11 16:00    The quest for novel high-temperature superconductors---Prospects and progress in iridates
534 2016-05-13 13:30    Aperiodic crystals in low dimensions
533 2016-05-13 16:00    Graphene analogue in (111)- BaBiO3 bilayer heterostructures for topological electronics
532 2016-05-16 16:00    Tuning microwave cavities with biased nonlinear dielectrics for axion searches
531 2016-05-17 11:00    The CERN Resonant WISP Search: Development, Results and Lesson-Learned
530 2016-05-19 15:00    The CERN Resonant WISP Search: Development, Results and Lesson-Learned
529 2016-05-19 16:00    Nonlinear/quantum optical effect in silicon nano-photonics
528 2016-05-24 16:00    Electronic and magnetic properties of 2D transition-metal thiophosphates and tunability of magnetic order with carrier density
527 2016-05-31 16:00    Understanding 3D tokamak physics towards advanced control of toroidal plasma
526 2016-06-01 10:30    Welcome to Nature Photonics
525 2016-06-01 16:00    Laboratory experiments relevant to mesospheric clouds, Saturn’s rings & astrophysical jets
524 2016-06-14 15:00    No-Insulation High Temperature Superconductor Magnet Technology for Compact, Reliable, and Low-Cost High Field DC Magnets
523 2016-06-14 16:00    Photonic quantum network based on multimode squeezed vacuums and single-photon subtraction