Superconducting vortex-charge measurement using cavity electromechanics
| Autor: | Sudhir Kumar Sahu, Supriya Mandal, Sanat Ghosh, Mandar M. Deshmukh, Vibhor Singh |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Superconductivity (cond-mat.supr-con)
Condensed Matter - Mesoscale and Nanoscale Physics Mechanical Engineering Condensed Matter::Superconductivity Condensed Matter - Superconductivity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) FOS: Physical sciences General Materials Science Bioengineering General Chemistry Condensed Matter Physics |
| Popis: | As the magnetic field penetrates the surface of a superconductor, it results in the formation of flux-vortices. It has been predicted that the flux-vortices will have a charged vortex core and create a dipolelike electric field. Such a charge trapping in vortices is particularly enhanced in high-T$_c$ superconductors (HTS). Here, we integrate a mechanical resonator made of a thin flake of HTS Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ into a microwave circuit to realize a cavity-electromechanical device. Due to the exquisite sensitivity of cavity-based devices to the external forces, we directly detect the charges in the flux-vortices by measuring the electromechanical response of the mechanical resonator. Our measurements reveal the strength of surface electric dipole moment due to a single vortex core to be approximately 30~$|e|a_B$, equivalent to a vortex charge per CuO$_2$ layer of $3.7\times 10^{-2}|e|$, where $a_B$ is the Bohr radius and $e$ is the electronic charge. Comment: 7 pages, 4 figures and Supporting Information |
| Databáze: | OpenAIRE |
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