Van der Waals heterostructures with photo-oxidised high-k dielectrics

自旋电子效应利用的是电子的自旋，而不是电子的电荷，这可能构成量子计算机的基础。我们的技术与自旋霍尔效应密切相关。在我们的例子中，由于电荷载流子自旋的光学极化，在没有磁场的情况下，当电流通过样品时，可以测量霍尔电压。这提供了有趣的设备潜力的可能性。与石墨烯类似的二维纳米材料也具有多个能带结构谷，从而可能产生低谷霍尔效应和自旋霍尔效应。这些纳米材料还具有独特的物理性质，因为它们具有原子的二维蜂窝结构。应变工程是石墨烯研究中的一个新兴领域，它利用的是只有一个原子厚度的石墨烯。这使得这种二维纳米材料容易受到外部影响，包括机械变形。我们将利用负载纳米材料相对于衬底的差热收缩和悬浮纳米材料相对于接触的差热收缩来研究应变对支撑和悬浮器件中拉曼光谱和光致发光光谱的影响。

Spintronic effects exploit the spin of electrons rather than their charge and could form the basis of a quantum computer. Our technique is closely related to the spin Hall effect. In our case, due to the optically-created polarisation of the charge-carrier spins, a Hall voltage can be measured, in the absence of a magnetic field, on passing a current through the sample. This offers the intriguing possibility of device potential. Two-dimensional nanomaterials, similar to graphene, also possess a number of bandstructure valleys, opening up the possibility of a valley Hall effect as well as the spin Hall effect.These nanomaterials also have unique physical properties due to their two-dimensional honeycomb structure of atoms. Strain-engineering is an emerging field in graphene research that exploits that it is only a single atom thick. This makes such two-dimensional nanomaterials amenable to external influences, including mechanical deformation. We will investigate the effect of strain on the Raman and photoluminescence spectra in both supported and suspended devices by exploiting the differential thermal contraction of supported nanomaterials with respect to their substrate and suspended nanomaterials with respect to their contacts.