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 1091600
379 <9/5> Dark Matter and Dark Energy in Cosmology 2008.09.01 86600
378 <3/30> Supersolidity in Helium 2011.03.25 86470
377 <11/7> Two- and three- body problems in classic and quantum mechanics 2012.10.29 86316
376 2012학년도 1학기 콜로퀴움 일정 안내 [5] 2012.02.29 86198
375 <3/23> 동서양의 세계관과 풍경화 2011.03.17 85911
374 <5/2> Electrical Instability in Nanoscale Channel Devices: Top-down & Bottom-up Approaches 2012.04.19 85699
373 <5/25> 나노켈빈 원자 기체의 보즈-아인슈타인 응집 2011.05.18 85564
372 <10/18(Thu.) 1:30pm>Machine Learning Approaches for Solving Physics Problems: Usability of Experimental Data 2018.10.15 85527
371 <Dec. 7(Wed.) 4:30 PM>Mechanotransduction of cells in vitro(세포기능의 역학적 조절) 2016.11.30 85321
370 <2/14> Basics of Gravitational Perturbatiosn 2011.02.11 85305
369 <4/14> Neutron Star 2006.04.10 85260
368 <April. 5 (Wed.) 4:30 PM>Majorana quasiparticles emergent in Kitaev quantum magnets 2017.03.31 85222
367 <4/6> Introduction to Superconducting Quantum Electronics 2007.04.03 85200
366 <5/4> Kondo effect in nanoscopic devices 2011.04.28 85188
365 <May.2(Wed.) 4:30 PM> Machine learning and statistical physics 2018.04.23 85101
364 <5/1> Schwinger Pair Production in dS_2 and AdS_2 2008.04.29 85005
363 <5/15>Do we live in 5D? 2007.05.15 84969
362 <9/21> Electronic phase transition in low dimensional SrTiO3/(Sr1-x,Lax)TiO3 oxide superlattices 2011.09.09 84948
361 <10/14> Applications of holographic QCD 2008.10.13 84771
360 <Dec.4(Wed.)>2D materials based metasurfaces & THz near-field spectroscopy 2019.11.27 84725