korean english


Home > 게시판 > 세미나

아래와 같이 콜로퀴움을 개최하오니 많이 참석해 주시기 바랍니다.

4시 20분부터 제1과학관 31214 e+강의실에서 다과를 준비하오니 많은 참석 부탁드립니다


아 래


제목: Proximity effects and low dimensional superconductivity of Pb nano-islands

연사: 김   정   대  교수님(울산대학교)


일시: 2013년 3월 27일(수) 오후4:30


장소: 제1과학관 31214  e+첨단강의실


초록: The proximity effect is a central feature of superconducting junctions that plays a key role in many devices and can be exploited in the design of new systems with quantum functionality.  Recently, exotic proximity effects have been observed in various systems, including superconductor–metallic nanowires and graphene–superconductor structures. However, it is still not clear how superconducting order propagates spatially in a heterogeneous superconductor system. I will present intriguing junction geometry effects in a heterogeneous system consisting of electronically two-dimensional superconducting islands on a metallic substrate. Depending on the local geometry, the superconducting gap induced at the metallic surface sometimes decays within ~ 20nm of the superconductor, and sometimes survives at distances that are several coherence lengths from a superconductor. I will show in particular that the curvature of the junction plays an essential role in the proximity effect.


If time allows, I would also like to discuss about superconductivity of Pb nano-islands. Reduction of the superconducting gap (D) is observed even when the island is larger than the bulk coherence length (x) and becomes very fast below 50 nm lateral size. The suppression of D with size depends to a good approximation only on the volume of the island and is independent of its shape.



1. Jungdae Kim, Victor Chua, Gregory A. Fiete, Hyoungdo Nam, A. H. MacDonald, and Chih-Kang Shih, Nature Phys. 8, 465 (2012)

2. Jungdae Kim, Gregory A. Fiete, Hyoungdo Nam, A. H. MacDonald, and Chih-Kang Shih, Phys. Rev. B 84, 014517 (2011)

3. Shengyong Qin, Jungdae Kim, Q. Niu, and Chih-Kang Shih, Science 324, 1314 (2009)

번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1091338
358 <10/30> Nambu and the Standard Model 2009.10.27 83369
357 <9/20> Time-reversal anomaly in Josephson effect involving Majorana fermions 2012.09.20 83411
356 <11/12> 다윈의 식탁 - 현대 진화론의 맛있는 논쟁 2010.11.05 83423
355 <3/13>Toric AdS4/CFT3 duals and M-theory Crystals 2007.03.08 83456
354 <3/27> The Born series for S-wave spin-quartet neutron-deuteron scattering at small cutoff values. 2013.03.25 83548
353 2010학년도 2학기 콜로퀴엄 일정 안내 2010.08.10 83605
352 <9/12> Observation of Higgs Particle at CERN 2012.09.07 83647
351 <3/30> Abelian Decomposition of Gravitation 2007.03.29 83700
350 2013학년도 2학기 콜로퀴움 일정 2013.09.06 83736
349 <3/24> 복잡계 네트워크와 경제물리학(Complex Networks and Econo-Physics) 2006.03.20 83843
348 <4/2> 다중벽탄소나노튜브를 이용한 AFM 탐침 개발과 응용 2010.03.29 83882
347 <4/6(Wed.) 1pm> Results from DM-Ice17 2016.04.05 84104
346 <4/25(토)> 세미나 개최 안내 2015.04.23 84281
345 <9/2(Mon) 15:00 ~ >Status of the KM3NeT Deep Sea Neutrino Telescope 2019.08.26 84351
344 <11/28>Vacuum transitions and tunneling in field theory and cosmology 2006.11.28 84366
343 <Nov.4(Wed.)>Progresses in Elucidating the Optoelectronic Properties of Perovskite Semiconductor 2020.10.28 84436
342 <9/20> 초전도분야 특별초청세미나 개최 file 2011.09.16 84518
341 <4/21(화)> 특별초청세미나 개최 안내 2015.04.03 84563
340 <Dec.4(Wed.)>2D materials based metasurfaces & THz near-field spectroscopy 2019.11.27 84650
339 <10/14> Applications of holographic QCD 2008.10.13 84757