visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2020-11-20 14:30 
연사  
장소 Online 

 

SRC Seminar

 

 

 

 

 

Lumpy Cooper pairs in an iron-based superconductor

 

 

 

Dr. Doohee Cho

 

Department of Physics, Yonsei University

 

 

 

Nov. 20 (Fri.), 02:30 PM

 

Online seminar

 

https://kaist.zoom.us/j/82243139535
회의 ID: 822 4313 9535
암호: 151742

 

 

 

 

 

 

 

Abstract:

 

Cooper pairs can tunnel through the vacuum barrier between two superconducting electrodes, known as a Josephson junction. One can extract the superconducting order parameter from the current-voltage curves close to zero bias. We use atomic-resolution Josephson scanning tunneling microscopy (STM) to visualize the spatial variations of the superfluid in the iron-based superconductor FeTe0.55Se0.45. To measure Cooper-pair tunneling, a Pb-coated tip was employed and its superconductivity was thoroughly verified by measuring noise enhancement induced by Andreev-reflection on Pb(111) surface. By simultaneously acquiring the topographic and electronic properties, we find that this inhomogeneity in the superfluid is not caused by structural disorder or strong inter-pocket scattering, and does not correlate with variations in the energy of the Cooper pair-breaking gap. Instead, we see a clear spatial correlation between superfluid density and the quasiparticle strength, defined as the height of the coherence peak, on a local scale. Our results shed light on the interplay between superconductivity and quasiparticle character that has been observed by photoemission experiments across the critical temperature in the unconventional superconductors.

 

 

 

 

 

Contact: SunYoung Choi, (sunyoungchoi@kaist.ac.kr)

Center for Quantum Coherence in Condensed Matter, KAIST

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)
565 2025-05-26 16:00  윤석호 박사(삼성종합기술원)  Photonics in the Age of AI: Industry Trends and Perspectives file
564 2023-03-17 11:00    (응집물리 세미나)Operando electron microscopy investigation of domain dynamics in twisted van der Waals materials file
563 2025-05-22 16:00  유현승 박사(삼성종합기술원)  Reconstructing Reality: Learning-based Methods for 3D Imaging and Graphics file
562 2022-12-07 16:00    (광학분야 세미나) Non-Hermitian physics and non-Hermitian singularity
561 2022-05-02 16:00    What can we learn from the history of science and technology?(우리말강의)
560 2022-04-28 16:00    (광학분야 특별세미나)Adiabaticity and symmetry in optical waveguide design
559 2025-04-11 11:00  옥종목 교수 (부산대학교 물리학과)  An Approach to Controlling Physical Properties:Defect-Engineered High-Quality Single Crystal Growth file
558 2025-01-23 14:00  여영기 박사  Complete Polytype switching by super lubricant van der Waals cavity arrays file
557 2024-04-19 15:00    Engineering Physics for Semiconductor Equipment Innovation file
556 2009-02-23 16:00    Physics Colloquium : 2009 Spring file
555 2014-03-10 16:00    Physics Colloquium : 2014 Spring file
554 2022-04-14 16:00    (광학분야 특별세미나)Holographic tomography of dielectric tensors at optical frequency
553 2022-11-11 11:00    [Update 세미나영상] (응집물리 세미나) Honeycomb oxide heterostructures for quantum spin liquid file
552 2022-03-07 16:00    Climate Physics and Modelling(우리말강의)
551 2022-08-01 10:00    [Update 세미나 영상] James Webb Space Telescope & OTE Commissioning
550 2022-10-27 16:00    (광학분야 세미나) Cavity optomechanical systems for quantum transduction
549 2011-05-16 16:00    Photonics with surface plasmon polaritons
548 2016-05-17 11:00    The CERN Resonant WISP Search: Development, Results and Lesson-Learned
547 2013-09-09 16:00    Physics Colloquium : 2013 Fall
546 2018-04-06 10:00    Entanglement and thermalization in many-body systems: recent progress file