New States of Hydrogen in a Circularly Polarized Electromagnetic Field

Abstract
We predict the existence in hydrogen of stable nonspreading Rydberg wave packet states that have no classical counterparts. We show their time-dependent creation from circular Rydberg states in numerical simulations. These states are both angularly and radially localized exactly in antiphase from the corresponding nonspreading (so-called Trojan) packet position and are stabilized by quantum interference.