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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.

 

[Reference]

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)

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