visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2023-04-27 11:00 
일시 April 27 (Thu) 11 AM 
장소 E6-2 #1322 
연사 Dr. Kyung Ho Kim (Royal Holloway University of London) 
Royal Holloway University of London 에서 초천도 나노와이어 양자현상을 연구하고 계신 김경호 박사를 모시고 세미나를 진행할 예정입니다.
관심있는 분들의 많은 참여 부탁드립니다.
 
We are delighted to announce the upcoming seminar by Dr. Kyung Ho Kim  (Royal Holloway University of London).
 
Date: April 27 (Thu) 11 AM
Place: 1322 Natural Science (No Zoom broadcasting)
Speaker: Dr. Kyung Ho Kim  (Royal Holloway University of London)  
 
Title: Inverse Shapiro steps and coherent quantum phase slip in superconducting nanowires  
 
Abstract:
We observe clearly visible steps at constant currents I=2efn on the current voltage characteristic of a superconducting nanowire with integer n, exposed to microwave of frequency f [1]. These current steps are dual steps to the well-known Shapiro steps in Josephson junctions which are currently used for commercial Josephson voltage standard in quantum metrology. The dual Shapiro step, or inverse Shapiro step, was theoretically predicted more than 30 years ago in Josephson junctions [2], but it was elusive for the experimentalists due to challenges of circuit engineering. Superconducting nanowires are another system that is predicted to show the dual Shapiro steps due to the coherent quantum phase slip [3]. We embed a superconducting nanowire in an appropriate electromagnetic environment. The inverse Shapiro step is exceedingly promising for closing the so-called quantum metrology triangle as the voltage standard is based on the usual Shapiro steps. I will discuss physics of QPS in superconducting nanowires and condition for the observation of the current quantization.  
 
[1] Shaikhaidarov, R.S., Kim, K.H., Dunstan, J.W. et al. Nature 608, 45–49 (2022) 
[2] Averin, D.V., Zorin, A.B., Likharev, K.K.: Bloch oscillations in small Josephson junctions. Soviet Physics - JETP 61(2), 407 (1985) 
[3] Mooij, J.E., Nazarov, Y.V.: Superconducting nanowires as quantum phase-slip junctions. Nature Physics 2(3), 169 (2006)
 
번호 날짜 장소 제목
416 2022-04-01 16:00  Zoom webinar  High-field Electron Transport and Interaction Induced Phenomena in 2D Materials file
415 2018-11-29 16:00  #1323, E6-2  양자 칸델라 실현을 위한 단일 광자 발생장치 개발 file
414 2024-03-07 16:00  Zoom  [CAPP seminars] Development of Superconducting Transition Edge Sensors at SRON file
413 2021-06-11 16:00  Online seminar  Pseudogap in surface-doped black phosphorus file
412 2016-11-11 13:30  #1323(E6-2. 1st fl.)  Bandgap Engineering of Black Phosphorus
411 2016-04-01 14:30  E6-2. 1st fl. #1501  Interference of single charged particles without a loop and dynamic nonlocality
410 2016-05-31 16:00  #1323(E6-2, 1st fl.)  Understanding 3D tokamak physics towards advanced control of toroidal plasma
409 2023-07-18 11:00  E6-2, #1323  Non-Hermitian Casimir Effect of Magnons
408 2024-06-13 16:00  E6-2, #1323  Magnonic $\varphi$ Josephson junction and its non-Hermitian Josephson diode effect
407 2023-09-14 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  [CAPP seminar] Dark matter searches in Water Cherenkov Detectors file
406 2018-05-11 14:30  E6-2. 1st fl. #1323  Disordered Floquet topological insulators file
405 2016-12-09 16:00  #1323(E6-2. 1st fl.  Shift Charge and Spin Photocurrents in Dirac Surface States of Topological Insulator
404 2022-05-13 14:30  Zoom webinar  Topological Superconducting Spintronics Towards Zero-Power Computing Technologies file
403 2021-07-29 14:00  Online seminar  Gravitationally Induced Dark Sector and Inflationary Dynamics file
402 2015-12-11 13:30  E6-2, #1323  Quantum spin liquid in the 1/3 depleted triangular lattice Ba3(Ru1-xIrx)Ti2O9
401 2016-03-11 13:30  E6-2. 1st fl. #1501  Topological phases of matter in nonequilibrium: Topology of the Wannier-Stark ladder
400 2018-11-01 16:00  #1323, E6-2  Direct holography from a single snapshot file
399 2022-08-18 10:00  E6-1 #1323  Disorder-driven phase transition in the second-order non-Hermitian skin effect
» 2023-04-27 11:00  E6-2 #1322  Inverse Shapiro steps and coherent quantum phase slip in superconducting nanowires
397 2015-07-16 16:00  E6-2, 1318  Next-generation ultrafast laser technology for nonlinear optics and strong-field physics