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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
430 2017-03-21 16:00  Seminar Room 1323  Spring 2017: Physics Seminar Serises file
429 2017-03-24 14:30  #1323 (1st fl. E6-2).  Topological Dynamics
428 2017-03-24 16:00  #1323 (1st fl. E6-2)  Graphene based nano electronics and nano electromechanics; focusing on precise control of nano structures for studying accurate physical properties
427 2017-04-05 12:00  Room 101, Creative Learning Bldg.(E11)  2017년 4월 첫수 융합포럼 개최 안내(물리학과 & 원자력 및 양자공학과 공동 개최)/The First Wednesday Multidisciplinary Forum in April 2017 organized by Dept. of Physics & Dept. of Nuclear & Quantum Engineering file
426 2017-04-06 16:00  IBS CAPP seminar room, Creation Hall (3F), KAIST Munji Campus  For whom the Belle tolls
425 2017-04-27 16:00  Seminar Room(#1323, E6-2)  반도체 양자점을 이용한 단광자 광원
424 2017-04-28 14:30  E6-2. 1st fl. #1323  Hot electron generation at surfaces and its impact to catalysis and renewable energy conversion
423 2017-04-28 16:00  #1323 (E6-2. 1st fl.)  Carbon nanotubes coupled to superconducting impedance matching circuits
422 2017-05-12 13:30  E6-2. 1st fl. #1323  Topological Dirac insulator
421 2017-06-02 14:30  E6-2. 1st fl. #1323  Quasiparticle Interference and Fourier transform scanning tunneling spectroscopy in WTe2 (Weyl semimetal) file
420 2017-06-02 16:00  #1323 (E6-2. 1st fl.)  Maxwell's demon in quantum wonderland file
419 2017-07-10 16:00  Jul. 10th (Mon), 4pm  “Intertwined Orders in a Heavy-fermion metal” file
418 2017-07-14 15:00  #1323 (E6-2. 1st fl.)  Chiral anomaly in disordered Weyl semimetals file
417 2017-08-16 16:00  #1322 (E6-2. 1st fl.)  Phonon-driven spin-Floquet valleytro-magnetism file
416 2017-08-31 14:00  #5318(E6-2. 5th fl.)  “Berry phase and nonlinear response: photocurrent in noncentrosymmetric insulators and Weyl semimetals” file
415 2017-09-12 16:00  #1323 (E6-2. 1st fl.)  Exact Solution for the Interacting Kitaev Chain at Symmetric Point file
414 2017-09-13 16:00  #1323 (E6-2. 1st fl.)  An Introduction to Quantum Spin Liquids file
413 2017-09-22 13:00  E6-2. 1st fl. #1323  Superconductor-metal-insulator transition in thin Tantalum films file
412 2017-09-22 14:30  E6-2. 1st fl. #1323  Quantum Electronic Transport in Graphene Hybrid Nanostructures file
411 2017-09-22 16:00  E6-2. 1st fl. #1323  Unexpected Electron-Pairing in Integer Quantum Hall Effect file