Probing Coherences and Itinerant Magnetism in a Dipolar Lattice Gas

Abstract

We report on the study of itinerant magnetism of lattice-trapped magnetic atoms, driven by magnetic dipole-dipole interactions, in the low-entropy and close-to-unit filling regime. We have used advanced dynamical decoupling techniques to efficiently suppress the sensitivity to magnetic field fluctuations. We have thus measured the spin coherence of an itinerant spin 3 Bose dipolar gas throughout a quantum phase transition from a superfluid phase to a Mott insulating phase. In the superfluid phase, a metastable ferromagnetic behavior is observed below a dynamical instability which occurs at lattice depths below the phase transition. In the insulating phase, the thermalization towards a paramagnetic state is driven by an interplay between intersite and superexchange interactions.

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BibTeX RIS

BibTeX

@article{laupretre2026probing,
  title = {{Probing Coherences and Itinerant Magnetism in a Dipolar Lattice Gas}},
  author = {Thomas Lauprêtre and Jose Daniel Bernal and Youcef Baamara and Ana Maria Rey and Laurent Vernac and Bruno Laburthe-Tolra},
  journal = {Physical Review Letters},
  year = {2026},
  month = nov,
  doi = {10.1103/h3fr-chgk},
  eprint = {2501.11402},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05610341v1},
  note = {CC BY-NC-ND 4.0},
}

RIS

TY  - JOUR
TI  - Probing Coherences and Itinerant Magnetism in a Dipolar Lattice Gas
AU  - Thomas Lauprêtre
AU  - Jose Daniel Bernal
AU  - Youcef Baamara
AU  - Ana Maria Rey
AU  - Laurent Vernac
AU  - Bruno Laburthe-Tolra
PY  - 2026
DA  - 2026/11/03
JO  - Physical Review Letters
DO  - 10.1103/h3fr-chgk
UR  - https://hal.science/hal-05610341v1
AB  - We report on the study of itinerant magnetism of lattice-trapped magnetic atoms, driven by magnetic dipole-dipole interactions, in the low-entropy and close-to-unit filling regime. We have used advanced dynamical decoupling techniques to efficiently suppress the sensitivity to magnetic field fluctuations. We have thus measured the spin coherence of an itinerant spin 3 Bose dipolar gas throughout a quantum phase transition from a superfluid phase to a Mott insulating phase. In the superfluid phase, a metastable ferromagnetic behavior is observed below a dynamical instability which occurs at lattice depths below the phase transition. In the insulating phase, the thermalization towards a paramagnetic state is driven by an interplay between intersite and superexchange interactions.
SN  - 0031-9007
SN  - 1079-7114
ER  -

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