Ultrafast carrier generation in Bi _{1- x} Sb _x thin films induced by intense monocycle terahertz pulses

摘要

Using terahertz-pump and terahertz-probe spectroscopy, we investigated terahertz-induced carrier generation processes in Bi_(1- x )Sb_( x )thin films. The field dependence of the terahertz-induced transmittance change indicates distinct nonlinearity related to the Zener tunneling in narrow band-gap materials.