This year the discovery of femtosecond demagnetization by laser pulses is 20 years old. For
the first time, this milestone work by Bigot and coworkers gave insight directly into the time …

Three-dimensional topological insulators are fascinating materials with insulating bulk yet
metallic surfaces that host highly mobile charge carriers with locked spin and momentum …

Using time-, spin-, and angle-resolved photoemission, we investigate the ultrafast spin
dynamics of hot electrons on the surface of the topological insulator Bi 2 Te 3 following …

Topological materials present unprecedented opportunities for the functionalization of
advanced concepts employed in the description of quantum matter. Ultrafast dynamics …

A combined dynamics for the spin and lattice degrees of freedom is proposed. For that we
couple a Heisenberg spin Hamiltonian via a distance dependent exchange integral and an …

Magnetic interactions in topological insulators cause essential modifications in the originally
mass-less surface states. They offer a mass gap at the Dirac point and/or largely deform the …

We investigate the ultrafast spin dynamics of the prototypical topological insulator Bi 2 Se 3
using time-resolved Kerr rotation (polarization-change) measurements across near-infrared …

Precise control of spatial spin structures, such as spin helices, is critical for advancing
spintronic devices, particularly in non-volatile, low-power information storage and …

Time-and angle-resolved photoemission spectroscopy (TR-ARPES) provides access to the
ultrafast evolution of electrons and many-body interactions in solid-state systems. However …

Ultrafast dynamics in three-dimensional topological insulators (TIs) opens new routes for
increasing the speed of information transport up to frequencies a thousand times faster than …