title: Coherent control of ultrafast shift currents in GaAs with chirped optical pulses.
abstract: We demonstrate the coherent control of ultrafast shift currents in GaAs with two orthogonally polarized linearly chirped laser pulses. By varying the chirp and phase delay between the pulses, we achieve the control of the shape of the shift current transients in a wide range from a monopolar shape to different bipolar shapes (alternating currents). Moreover, the terahertz emission patterns resulting from the ultrafast shift currents allow one to determine the sign of the chirp of the laser pulses.
authors.affiliation: Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany. ana.m.racu@ptb.de
authors.forename: Ana Maria
authors.initials: AM
authors.lastname: Racu
authors.forename: Shekhar
authors.initials: S
authors.lastname: Priyadarshi
authors.forename: Markus
authors.initials: M
authors.lastname: Leidinger
authors.forename: Uwe
authors.initials: U
authors.lastname: Siegner
authors.forename: Mark
authors.initials: M
authors.lastname: Bieler