標題: Microwave absorption in the cores of the Abrikosov vortices pinned by artificial insulator inclusion
作者: Rosenstein, B.
Shapiro, I.
Shapiro, B. Ya.
Deutch, E.
電子物理學系
Department of Electrophysics
關鍵字: Pinned vortex;Bogoliubov-deGennes theory;Microwave absorption
公開日期: 1-九月-2012
摘要: The spectrum of core excitations of the Abrikosov vortex pinned by a dielectric inclusion or nanoholes of the size of the coherence length is considered using the Bogoliubov-deGennes equations beyond the semiclassical approximation. While the lowest excitation, mini-gap, in the unpinned (or pinned by a metallic defect) vortex is of the order of Delta(2)/epsilon(F), it becomes of the order of the superconducting gap Delta. The reconstruction of the quasiparticle excitations' spectrum has a significant impact on optical properties and on the tunneling density of states. We calculate the absorption amplitude and point out that, while in STM the energy gap Delta(DOS) is between a quasiparticles state with angular momentum mu(e) = mu(s) > 1/2 and quasi-hole with mu(h) = mu(s) the microwave absorption gap, Delta(dir) is between states with mu(e) = mu(h) + 1. It is shown that Delta(dir) > Delta(DOS). The large mini-gap might play a role in magneto-transport phenomena broadly associated with the "superconductor-insulator" transition in quasi 2D systems in which small insulating inclusions are generally present. (C) 2012 Elsevier B. V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.physc.2011.12.012
http://hdl.handle.net/11536/16876
ISSN: 0921-4534
DOI: 10.1016/j.physc.2011.12.012
期刊: PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
Volume: 479
Issue: 
起始頁: 57
結束頁: 60
顯示於類別:期刊論文


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  1. 000308580600012.pdf