ULTRAFAST LATTICE AND ELECTRON DYNAMICS INDUCED IN A PbSe CRYSTAL BY AN INTENSE TERAHERTZ PULSE

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Abstract

The ultrafast optical response of a PbSe crystal to an intense picosecond terahertz pulse with a peak electric field strength of up to ∼ 500 kV/cm is studied. The reflectivity anisotropy signal contains oscillations at the fundamental frequency of the resonant infrared-active phonon mode as well as its second, third, and fourth harmonics. The effect is ascribed to coherent anharmonic phonons resonantly excited by the strong terahertz field. Pump terahertz pulses also induce an almost instantaneous Kerr effect and a long-lived optical anisotropy of the crystal with a characteristic decay time of ≳ 100 ps. We consider lattice distortion and phonon-assisted side valley population as possible origins of this metastable state.

About the authors

A. A Melnikov

Institute for Spectroscopy, Russian Academy of Sciences

Author for correspondence.
Email: melnikov@isan.troitsk.ru
Troitsk, Moscow, Russia

Yu. G Selivanov

P. N. Lebedev Physical Institute, Russian Academy of Sciences

Email: melnikov@isan.troitsk.ru
Moscow, Russia

D. G Poydashev

Institute for Spectroscopy, Russian Academy of Sciences

Email: melnikov@isan.troitsk.ru
Troitsk, Moscow, Russia

S. V Chekalin

Institute for Spectroscopy, Russian Academy of Sciences

Email: melnikov@isan.troitsk.ru
Troitsk, Moscow, Russia

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