Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-08-09
Phys. Rev. Lett. 107, 077401 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Accepted to Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.107.077401
Topological insulators possess completely different spin-orbit coupled bulk and surface electronic spectra that are each predicted to exhibit exotic responses to light. Here we report time-resolved fundamental and second harmonic optical pump-probe measurements on the topological insulator Bi2Se3 to independently measure its photo-induced charge and spin dynamics with bulk and surface selectivity. Our results show that a transient net spin density can be optically induced in both the bulk and surface, which may drive spin transport in topological insulators. By utilizing a novel rotational anisotropy analysis we are able to separately resolve the spin de-polarization, intraband cooling and interband recombination processes following photo-excitation, which reveal that spin and charge degrees of freedom relax on very different time scales owing to strong spin-orbit coupling.
Gardner Dillon R.
Gedik Nuh
Hsieh David
Lee Young Sam
Mahmood Fathy
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