visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2023-04-27 11:00 
연사  
장소 E6-2 #1322 
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 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)
555 2016-04-08 13:30    Theoretical Overview of Iron-based superconductors and its future
554 2016-04-08 16:00    Spectroscopic studies of iron-based superconductors : what have we learned?
553 2016-04-12 16:00    Confinement of Superconducting Vortices in Magnetic Force Microscopy
552 2016-04-18 15:30    First Principles Approaches for Intermolecular Interactions: From Gas-Phase Dimers to Liquid Water and Molecular Crystal Polymorphism file
551 2016-04-19 14:00    Nonlocal collisional electron transport in partially ionized plasma generation, structure, and stability
550 2016-04-26 16:00    Transport spectroscopy for electronic bands in carbon-based nanomaterials with weak-bond contacts
549 2016-04-28 15:00    Lattice/Spin/Charge Coupling in 5d Pyrochlore Cd2Os2O7
548 2016-05-11 16:00    The quest for novel high-temperature superconductors---Prospects and progress in iridates
547 2016-05-13 13:30    Aperiodic crystals in low dimensions
546 2016-05-13 16:00    Graphene analogue in (111)- BaBiO3 bilayer heterostructures for topological electronics
545 2016-05-16 16:00    Tuning microwave cavities with biased nonlinear dielectrics for axion searches
544 2016-05-17 11:00    The CERN Resonant WISP Search: Development, Results and Lesson-Learned
543 2016-05-19 15:00    The CERN Resonant WISP Search: Development, Results and Lesson-Learned
542 2016-05-19 16:00    Nonlinear/quantum optical effect in silicon nano-photonics
541 2016-05-24 16:00    Electronic and magnetic properties of 2D transition-metal thiophosphates and tunability of magnetic order with carrier density
540 2016-05-31 16:00    Understanding 3D tokamak physics towards advanced control of toroidal plasma
539 2016-06-01 10:30    Welcome to Nature Photonics
538 2016-06-01 16:00    Laboratory experiments relevant to mesospheric clouds, Saturn’s rings & astrophysical jets
537 2016-06-14 15:00    No-Insulation High Temperature Superconductor Magnet Technology for Compact, Reliable, and Low-Cost High Field DC Magnets
536 2016-06-14 16:00    Photonic quantum network based on multimode squeezed vacuums and single-photon subtraction