Sahu, SK and Mandal, S and Ghosh, S and Deshmukh, MM and Singh, V (2022) Superconducting Vortex-Charge Measurement Using Cavity Electromechanics. In: Nano Letters, 22 (4). 1665 -1671.
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Abstract
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-Tc superconductors (HTS). Here, we integrate a mechanical resonator made of a thin flake of HTS Bi2Sr2CaCu2O8+δ 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|aB, equivalent to a vortex charge per CuO2 layer of 3.7 × 10-2|e|, where aB is the Bohr radius and e is the electronic charge.
| Item Type: | Journal Article |
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| Publication: | Nano Letters |
| Publisher: | American Chemical Society |
| Additional Information: | The copyright for this article belongs to Authors. |
| Keywords: | Calcium compounds; Copper oxides; Electric fields; High temperature superconductors; Microwave oscillators; Microwave resonators; Oscillistors; Quantum optics; Strontium compounds, Cavity optomechanics; Charge measurements; Electro-mechanics; High T c; High- Tcsuperconductor; Magnetic-field; Mechanical resonators; Superconducting vortices; Vortex charge; Vortex cores, Bismuth compounds |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 10 Mar 2022 07:32 |
| Last Modified: | 15 Jun 2022 05:36 |
| URI: | https://eprints.iisc.ac.in/id/eprint/71533 |
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