title: Use of the relative phase in a bichromatic field pulse to control a quasienergy gap.
abstract: We show experimentally and theoretically how the relative phase in a short, linearly polarized microwave pulse consisting of two phase-locked frequencies is effective for strong-field quantum control of He Rydberg atoms when the frequency ratio p:q is 3:1. It is also effective when p:q = 2:1 but less effective for 3:2. Parameters in our experiment are similar to those investigating quantum control of tightly bound atoms or molecules with ultrashort pulsed lasers.
authors.affiliation: Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794-3800, USA.
authors.forename: L
authors.initials: L
authors.lastname: Sirko
authors.forename: S A
authors.initials: SA
authors.lastname: Zelazny
authors.forename: P M
authors.initials: PM
authors.lastname: Koch