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
178 2019-04-19 16:00  E6-2. 1st fl. #1323  Graphene and hBN heterostructures file
177 2019-06-17 10:30  #1323, E6-2  Chiral Spintronics file
176 2015-07-15 14:00  E6-2,1323  Electronic and optical properties of titanate-based oxide superlattices
175 2016-09-29 16:00  E6-2 #1323 (1st floor)  Large-scale Silicon Photonic MEMS Switches
174 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
173 2022-06-10 16:00  E6-2. 1st fl. #1323  Fe5GeTe2의 나선형 자성특성과 자기저항의 전류밀도 의존성 연구 file
172 2015-12-03 16:00  E6-2, #1323  Hybrid solid state spin qubits in wide bandgap semiconductors
171 2017-06-02 16:00  #1323 (E6-2. 1st fl.)  Maxwell's demon in quantum wonderland file
170 2022-11-09 16:00  E6-2. 1st fl. #1323  Radio Astronomy, Radio Interferometry, and Multi-wavelength Studies on Relativistic Jets
169 2023-05-03 16:00  E6-2, #2502  Probing microscopic origins of axions by the chiral magnetic effect
168 2020-10-15 17:00  https://bit.ly/3ndIiJn  Time crystals, quasicrystals, and time crystal dynamics in the superfluid universe file
167 2022-03-31 10:00  E6 #1501/zoom  Weiss fields for Quantum Spin Dynamics file
166 2022-03-29 10:00  E6 #1501/zoom, E6 #2502/zoom  Non-reciprocal phase transitions file
165 2018-11-09 14:30  E6-2. 1st fl. #1323  Moiré superlattices – from twisted bilayer graphene to quasicrystal file
164 2015-10-16 15:00  E6-2, 5th fl. #5318  High Magnetic Fields to Probe the sub-eV range of Particle/Astroparticle Physics - From the OSQAR experiments at CERN up to new perspectives at LNCMI-Grenoble
163 2018-07-02 15:00  Seminar Room (C303), Creation Hall (3F), KAIST Munji Campus  High Precision Magnetic Field Measurement for the Muon g-2 Experiment file
162 2016-06-01 10:30  BK21 Conference Room (#1318, E6-2)  Welcome to Nature Photonics
161 2018-05-11 16:00  E6-2. 1st fl. #1323  암페어 단위 재정의와 단전자 펌프 소자 개발 file
160 2016-04-26 16:00  #1323(1st Floor. E6-2)  Transport spectroscopy for electronic bands in carbon-based nanomaterials with weak-bond contacts
159 2022-08-12 10:00  E6-1 #1323  Twisted Bilayer Magnets file