Atomic, Molecular, Optical Science

AMOS encompasses the research in
atomic, molecular, and optical science
at the Weizmann Institute of Science.

AMOS Research Areas

AMOS is a center for quantum physics with atomic, molecular, and optical systems, at the Weizmann Institute of Science. The center includes 15 research groups and activities ranging across most contemporary topics in AMO physics - from atto-second pulses and intense lasers, through precision spectroscopy of ultracold atoms, molecules or ions, to quantum information and quantum optics. AMOS members hold faculty appointments in both the Physics and Chemistry Faculties at the Weizmann Institute of Science.

A wide range of interests and scientific excellence contribute to making AMOS one of Israel's leading research centers. AMOS scientists publish annually numerous scientific manuscripts in leading journals.

News

  • Date: December 2, 2025

    Optica

  • Date: January 15, 2025

    2024 Tenne Family Prize

  • Date: June 16, 2024

    Morris L. Levinson Prize in Physics

All News

Seminars

Publications

  • Unraveling Size Dependent Bi- and Tri-Exciton Characteristics in CdSe/CdS Core/Shell Quantum Dots via Ensemble Time Gated Heralded Spectroscopy

    Scharf E., Liran R., Levi A., Alon O., Chefetz N., Oron D. & Banin U. (2025) Small.
    Multiexcitons in quantum dots (QDs) manifest many-body interactions under quantum confinement and are significant in numerous optoelectronic and quantum applications. Yet, the strong interactions between multiexcitons leading to rapid non-radiative Auger decay introduce challenges for their characterization. While so far, the measurement techniques rely either on indirect methods or on single particle studies, herein a new method is introduced to study multiexcitons in QD ensembles utilizing spectrally resolved time-gated heralded spectroscopy. With this approach, the biexciton binding energies is extracted in CdSe/CdS QD ensembles of several core/shell sizes, manifesting a transition between attractive to repulsive exciton-exciton interactions. Additionally, for triexcitons, involving occupation of two excitons in the 1s energy levels and one exciton in the 1p energy levels, the open issues of extracting the lifetime, the spectra of the two triexciton pathways and their branching ratio are resolved. The ensemble measurements provide high photon counts and low noise levels, and alongside the time-gated heralded approach, thus enable the observation of multiexciton characteristics that are often obscured in single particle studies. The approach can be further implemented in the characterization of the energies and lifetimes of multiexcitons in other QD systems to enable rapid characterization and understanding.
  • Exploring the role of chaos in model recollision processes

    Berkheim J. & Tannor D. J. (2025) Journal of Chemical Physics.
    The physics of particle recollisions offers a window into the complex dynamics of interactions between charged particles and external fields. While simple classical models often describe these recollisions by focusing on the motion driven by an external field alone, e.g., the three-step model in high harmonic generation, this assumption excludes the possibility of chaotic behavior. In this work, we explore how chaotic motion emerges in recollision processes by including the strength of the Coulomb potential as a parameter. Through a continuous scan of system parameters, we uncover the transition from regularity to chaos. Interestingly, we find a transition from regular to chaotic to regular motion as a function of the 2D scan of Coulomb strength and field strength. In addition, scanning over the initial phase of the driving field allows us to identify the sensitive dependence on initial conditions characteristic of chaotic motion. Our findings reveal that the system can exhibit chaotic dynamics on timescales much longer than the initial recollision.