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 |