In the first part I will talk about the Nernst effect [1] and fluctuation diamagnetism and their correlation in high-Tc superconductors. I will describe a calculation employing a phenomenological Ginzgurg-Landau-like model to evaluate the transport coefficient α_xy and the magnetization M. The dimensionless ratio M/ (Tα_xy ) can be used to quantify the correlation between the Nernst effect and magnetization over the entire range of experimentally accessible values of field, temperature and doping. I will also demonstrate how the model employed explains the occurrence of diamagnetism and the Nernst effect in the pseudogap phase of cuprates.
In the second part I will talk about our recent study on the thermoelectric transport properties across twisted bilayer graphene [2]. We develop a phenomenological model based on the Landauer-Büttiker transport formalism to understand the thermoelectric transport measurement performed between two individual graphene layers placed within van der Waals separation with a relative twist angle between them. By performing a detailed analysis of the Seebeck coefficient we conclude that the measured thermopower is determined by the cross-plane layer-breathing mode rather than the properties of the tunnel junction.