Nonreciprocal charge transport in the titanium sesquioxide heterointerface superconductor
arxiv(2024)
摘要
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 Ti_2O_3 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.
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