Observation of Field-Free Molecular Orientation by Terahertz Few-Cycle Pulses

Abstract

We demonstrate theoretically that the long-lived and efficient field-free molecular orientation can be realized by utilizing two few-cycle terahertz pulses (FCTPs) appropriately delayed in time at a finite temperature. The calculations are performed by solving the time-dependent Schrödinger equation including the vibrational and rotational degrees of freedom, with LiH as example. By adjusting these parameters of TFCP, a high efficient and long-lived molecular orientation can be obtained.