Negative resistance state in superconducting NbSe<sub>2</sub> induced by surface acoustic waves.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 32937360.
- Also identified by DOI 10.1126/sciadv.aba1377 and PMC identifier 7442479.
- Licence recorded as CC BY-NC.
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Abstract
We report a negative resistance, namely, a voltage drop along the opposite direction of a current flow, in the superconducting gap of NbSe<sub>2</sub> thin films under the irradiation of surface acoustic waves (SAWs). The amplitude of the negative resistance becomes larger by increasing the SAW power and decreasing temperature. As one possible scenario, we propose that soliton-antisoliton pairs in the charge density wave of NbSe<sub>2</sub> modulated by the SAW serve as a time-dependent capacitance in the superconducting state, leading to the dc negative resistance. The present experimental result would provide a previously unexplored way to examine nonequilibrium manipulation of the superconductivity.