Post-doctoral position in "Multiscale modelling of moiré materials"
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The goal of the project is to build theoretical models to describe the rich phenomenology observed in moiré-patterned Van der Waals materials, including (but not restricted to) twisted bilayer graphene.
Our approach will be holistic albeit based on two fundamental aspects of these systems:
1) Their dual character (of soft-hard matter) associated with the lack of translational invariance and the existence of soft phonons (or phasons), which may be responsible for anomalous transport and thermodynamic properties observed at low temperatures as well as for playing a role in the onset of superconductivity.
2) The sensitivity of the single-electron spectrum as well as of the electron correlated phases to various ambiental conditions (substrate, tensions, twist-angle disorder, etc). In that regard, non-linear responses are instrumental to discriminate against different forms of symmetry breaking. We will focus on photogalvanic effects, second-harmonic generation and different forms of optical activity, and how they are affected by often neglected couplings such as the ones induced by lattice commensuration or by the spin-orbit interaction. We aim to develop new calculation schemes to evaluate these effects and establish a connection between these observables and the electronic phases of moiré materials, discriminating between theoretical models in the process.
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