title: Mechanism of molecular orientation by single-cycle pulses.
abstract: Significant molecular orientation can be achieved by time-symmetric single-cycle pulses of zero area, in the THz region. We show that in spite of the existence of a combined time-space symmetry operation, not only large peak instantaneous orientations, but also nonzero time-average orientations, over a rotational period, can be obtained. We show that this unexpected phenomenon is due to interferences among eigenstates of the time-evolution operator, as was described previously for transport phenomena in quantum ratchets. This mechanism also works for appropriate sequences of identical pulses, spanning a rotational period. This fact can be used to obtain a net average molecular orientation regardless of the magnitude of the rotational constant.
authors.affiliation: Instituto de Estructura de la Materia, CSIC, Serrano 121, 28006 Madrid, Spain.
authors.forename: Juan
authors.initials: J
authors.lastname: Ortigoso