Project A05

 Christoph Schmid
 Fabian Sandner
Prof. Dr. Rupert Huber
Dr. Christoph Lange

Ultrafast dynamics of Dirac fermions in topological insulators


We exploit few-cycle multi-terahertz pulses to probe, image and accelerate Dirac fermions on the surface of 3D topological insulators. With latest femtosecond near-field optical microscopy, we will target the spatio-temporal dynamics of Dirac quasiparticles and collective plasmons in topological surface states of (Bi,Sb)2(Se,Te)3-based compounds. Atomically strong multi-terahertz fields will be used to accelerate Dirac fermions through the Brillouin zone on sub-cycle time scales, enabling high-order harmonic generation and all-optical bandstructure reconstruction. We will furthermore try to verify a long-standing prediction by the Dirac equation: Zitterbewegung of relativistic electrons.