Title: Out-of-plane spin-to-charge conversion at low temperatures in graphene/MoTe$_2$ heterostructures Show Chinese title

Title: 平面外自旋到电荷的转换在石墨烯/MoTe$_2$异质结构中的低温表现

Abstract: Multi-directional spin-to-charge conversion - in which spin polarizations with different orientations can be converted into a charge current in the same direction - has been demonstrated in low-symmetry materials and interfaces. This is possible because, in these systems, spin to charge conversion can occur in unconventional configurations in which spin polarization and charge current where charge current, spin current and polarization do not need to be mutually orthogonal. Here, we explore, in the low temperature regime, the spin-to-charge conversion in heterostructures of graphene with the low-symmetry 1T' phase of MoTe$_2$. First, we observe the emergence of charge conversion for out-of-plane spins at temperatures below 100 K. This unconventional component is allowed by the symmetries of both MoTe$_2$ and graphene and likely arises from spin Hall effect in the spin-orbit proximitized graphene. Moreover, we examine the low-temperature evolution of non-local voltage signals arising from the charge conversion of the two in-plane spin polarizations, which have been previously observed at higher temperature. As a result, we report omni-directional spin-to-charge conversion - for all spin polarization orientations - in graphene/MoTe${_2}$ heterostructures at low temperatures. Show Chinese abstract

Abstract: 多方向自旋-电荷转换——其中不同取向的自旋极化可以转换为同一方向的电荷电流——已在低对称性材料和界面中得到演示。 这是可能的，因为在这些系统中，自旋到电荷的转换可以在非传统配置中发生，其中自旋极化和电荷电流、自旋电流和极化不需要相互正交。 在此，我们在低温范围内，研究了石墨烯与低对称性的1T'相MoTe$_2$异质结构中的自旋-电荷转换。 首先，我们在低于100 K的温度下观察到了面外自旋的电荷转换的出现。这种非传统的成分由MoTe$_2$和石墨烯的对称性所允许，并可能源于自旋轨道近邻石墨烯中的自旋霍尔效应。 此外，我们研究了来自两种面内自旋极化的电荷转换产生的非本地电压信号在低温下的演化，这些信号之前在较高温度下已被观察到。 因此，我们在低温下报告了石墨烯/MoTe${_2}$异质结构中的全方向自旋-电荷转换——对于所有自旋极化方向。