Nonreciprocal charge transport in the titanium sesquioxide heterointerface superconductor
Abstract
Nonreciprocal charge transport in heterostructural superconductors exhibits appealing quantum physical phenomena and holds the promising potential for superconducting circuits applications. Realizing a nonreciprocity is, however, fundamentally and technologically challenging, as it requires a material structure without a centre of inversion, which is scarce among superconducting materials. Here, we report an evidence of helical superconductivity, in which the Rashba spin-orbit coupling induces momentum-dependent superconducting gap in the inversion symmetry breaking heterointerface superconductor consisting of Mott insulating TiO and polar semiconducting GaN. Remarkably, the nonlinear responses emerge in the superconducting transition regime, when the magnetic field is precisely aligned in-plane orientations perpendicular to the applied current. In particular, the observed nonreciprocal supercurrent is extremely sensitive to the direction of the magnetic field for 0.5 degree, suggestive of a crossover from a symmetry breaking state to a symmetric one. Our finding not only unveils the underlying rich physical properties in heterointerface superconductors, but also provides an exciting opportunity for the development of novel mesoscopic superconducting devices.
Keywords
Cite
@article{arxiv.2401.13072,
title = {Nonreciprocal charge transport in the titanium sesquioxide heterointerface superconductor},
author = {Peng Dong and Lijie Wang and Guanqun Zhang and Jiadian He and Yiwen Zhang and Yifan Ding and Xiaohui Zeng and Jinghui Wang and Xiang Zhou and Yueshen Wu and Wei Li and Jun Li},
journal= {arXiv preprint arXiv:2401.13072},
year = {2024}
}