Superconducting diode effect under time-reversal symmetry.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39083606.
- Also identified by DOI 10.1126/sciadv.ado1502 and PMC identifier 11290479.
- Licence recorded as CC BY-NC.
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Abstract
In noncentrosymmetric superconductors, superconducting and normal conductions can interchange on the basis of the current flow direction. This effect is termed a superconducting diode effect (SDE), which is a focal point of recent research. The broken inversion and time-reversal symmetry is believed to be the requirements of SDE, but their intrinsic role has remained elusive. Here, we report strain-controlled SDEs in a layered trigonal superconductor, PbTaSe<sub>2</sub>. The SDE was found exclusively in a strained device with its absence in an unstrained device despite that it is allowed in unstrained trigonal structure. Moreover, the zero-field or magnetic field-even (magnetic field-odd) SDE is observed when the strain and current are along armchair (zigzag) direction The results unambiguously demonstrate the intrinsic SDE under time-reversal symmetry and the critical role of strain-induced electric polarization.