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19 April 2024 |
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Article overview
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Unconventional vortex core structure in quantum-confined superconducting Ga islands | | Huimin Zhang
; Zi-Xiang Li
; Junping Peng
; Jiaqi Guan
; Zhi Li
; Lili Wang
; Can-Li Song
; Ke He
; Shuaihua Ji
; Xi Chen
; Hong Yao
; Xucun Ma
; Qi-Kun Xue
; | | Date: |
21 Jan 2015 | | Abstract: | Nanoscale superconductivity is of great importance not only in fundamental
science but also in applications of superconducting devices. Considerable
theoretical efforts have been previously conducted to explore exotic magnetic
vortices in circular disk1-3, triangle4, square5-7 and rectangle8
nanostructures. Depending on the size and shape of nanostructures, exotic
vortices such as giant vortex and antivortex-vortex molecule have been
predicted, but only indirectly evidenced in experiments9-11. Here we employed
low temperature scanning tunneling microscopy and spectroscopy to image
directly magnetic vortices in superconducting rectangular Ga nanoislands, and
found that the rectangular Ga islands exhibit extremely anisotropic vortex
cores with an aspect ratio of as large as 40. We show that this novel vortex
structure could come from quantum confinement resulted shape resonances in
superconducting order parameter, as further supported by our Bogoliubov
de-Gennues self-consistent mean-field calculations. The study provides new
physical insight into the quantum confinement effects of superconductivity and
useful information on the design of nanoscale superconducting devices. | | Source: | arXiv, 1501.5067 | | Services: | Forum | Review | PDF | Favorites | |
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