Using dynamical decoupling to investigate magnetism of large-spin atoms
Abstract
We present a detailed investigation of itinerant magnetism in a dipolar Bose gas of chromium atoms confined in a three-dimensional optical lattice, expanding on results recently reported in [1]. In the low-entropy, near-unit filling regime, we employ advanced dynamical decoupling techniques to suppress magnetic-field noise and probe spin coherence across the superfluid-Mott insulator transition. Here, we provide a systematic comparison of different dynamical decoupling sequences, analyze their robustness to experimental imperfections, and quantify their impact on spin dynamics. We also develop perturbative and effective-model approaches that capture the role of both contact and dipolar interactions in determining spin coherence. In the superfluid regime, we discuss a hydrodynamic description that elucidates the emergence and breakdown of metastable ferromagnetism. In the insulating regime, we derive effective spin models including super-exchange terms. In this limit we introduce a tractable spin-1 toy model and a short time expansion of the full spin-3 dynamics that help to shed insight on the interplay between dipolar and contact-driven super-exchange dynamics observed experimentally for spin-3. Our comprehensive analysis bridges experiment and theory, providing new tools and perspectives for understanding itinerant dipolar magnetism in optical lattices.
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BibTeX
@article{laupretre2026using,
title = {{Using dynamical decoupling to investigate magnetism of large-spin atoms}},
author = {Thomas Lauprêtre and Jose Daniel Bernal and Youcef Baamara and Ana Maria Rey and Bruno Laburthe-Tolra and Laurent Vernac},
journal = {Physical Review A},
year = {2026},
month = nov,
doi = {10.1103/jm4k-wg56},
url = {https://hal.science/hal-05610348v1},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - JOUR
TI - Using dynamical decoupling to investigate magnetism of large-spin atoms
AU - Thomas Lauprêtre
AU - Jose Daniel Bernal
AU - Youcef Baamara
AU - Ana Maria Rey
AU - Bruno Laburthe-Tolra
AU - Laurent Vernac
PY - 2026
DA - 2026/11/03
JO - Physical Review A
DO - 10.1103/jm4k-wg56
UR - https://hal.science/hal-05610348v1
AB - We present a detailed investigation of itinerant magnetism in a dipolar Bose gas of chromium atoms confined in a three-dimensional optical lattice, expanding on results recently reported in [1]. In the low-entropy, near-unit filling regime, we employ advanced dynamical decoupling techniques to suppress magnetic-field noise and probe spin coherence across the superfluid-Mott insulator transition. Here, we provide a systematic comparison of different dynamical decoupling sequences, analyze their robustness to experimental imperfections, and quantify their impact on spin dynamics. We also develop perturbative and effective-model approaches that capture the role of both contact and dipolar interactions in determining spin coherence. In the superfluid regime, we discuss a hydrodynamic description that elucidates the emergence and breakdown of metastable ferromagnetism. In the insulating regime, we derive effective spin models including super-exchange terms. In this limit we introduce a tractable spin-1 toy model and a short time expansion of the full spin-3 dynamics that help to shed insight on the interplay between dipolar and contact-driven super-exchange dynamics observed experimentally for spin-3. Our comprehensive analysis bridges experiment and theory, providing new tools and perspectives for understanding itinerant dipolar magnetism in optical lattices.
SN - 2469-9926
SN - 2469-9934
ER -