Expérimental
The first measurements of superconductivity and correlated phases in twisted bilayer graphene (tBLG) brought a lot of attention to this new way to control the properties of matter: twisting layers in a van der Waals (vdW) heterostructure. The superconducting state in tBLG or twisted van der Waals structures is believed to have its origin in the interplay between the moiré superlattice and the interlayer interactions, which leads to the formation of a flat band in the electronic band structure. Controlling the twist angle between the layers allows playing with both of these parameters at the same time. As layers get more aligned, the moiré superlattice wavelength and the layer hybridization increases. However, as the two layers get more and more aligned, at angles >1.1°, the superconducting temperature decreases. The most challenging part of this research seems to lay in a reliable fabrication of homogeneous samples. In our laboratory we have developed a new technique to continiously control the angular alignment between layers [Science 361, 690]. In this experimental internship, we propose to use a new technique to control the angular alignment between layers in a vdW heterostructure combined with low temperature measurements of electron transport to reveal the phase diagram of the superconducting state and other strongly correlated effect.