Dirac Materials

Dirac Materials


In the recent years, materials with conical band structure have attracted much attention. There the electrons behave like relativistic particles, albeit moving hundreds of times slower than light. In graphene, a monoatomic layer of carbon, the conical electronic dispersion leads to the anomalous Hall effect, frequency-independent optical conductivity, giant Faraday effect, and marginal Fermi liquid behavior. Dirac dispersion in three-dimensional materials such as bismuth or cadmium arsenide causes large thermoelectric power, giant magneto-optical effects, and other functional properties. We explore the rich fundamental physics of these compounds, and the possibility of applications using optical (terahertz and infrared) spectroscopy.


 

The dispersion of the p, p* bands of graphene, as a function of wave vector components (kx,ky), from a Tight Binding model with nearest neighbours hopping. [D. Valentinis]

 

Réalisation: Sur Mesure concept