Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session S00: Poster Session III (4pm-6pm CDT)
4:00 PM,
Thursday, June 6, 2024
Room: Hall BC
Abstract: S00.00090 : Microwave-shielded polar molecules: from evaporation to tetratomic molecules
Presenter:
Sebastian Eppelt
(Max-Planck-Institute of Quantum Optics)
Authors:
Sebastian Eppelt
(Max-Planck-Institute of Quantum Optics)
Shrestha Biswas
(Max-Planck-Institute of Quantum Optics)
Xing-Yan Chen
(Max Planck Institute of Quantum Optics)
Andreas Schindewolf
(Max Planck Institute for Quantum Optics)
Timon A Hilker
(Max Planck Institute of Quantum Optics)
Immanuel Bloch
(Max Planck Institute for Quantum Optics)
Xin-Yu Luo
(Max-Planck-Institut für Quantenoptik)
polar molecules are a promising platform for realizing exotic quantum matter, for
implementing quantum information schemes and for performing precision
measurements.
In many of these applications, samples of interacting molecular need to be prepared
in the quantum-degenerate regime. For a long time, employing direct evaporative
cooling via elastic collisions has been prevented by intrinsically unstable two-body
collisions of molecules at short range. Protecting molecules against such detrimental processes can be
achieved by engineering a repulsive barrier using a blue-detuned, circularly polarized
microwave field which couples the two lowest rotational states.
Here, I demonstrate how microwave shielding can be employed to evaporatively cool
a fermionic, three-dimensional gas of 23Na40K well below the Fermi temperature.
Furthermore, I will show how the microwave field can be tuned to shape the
intermolecular potential, independently tuning dipolar and contact interaction,
allowing us to observe of a novel kind of scattering resonance. These universal fieldlinked
resonances arise due to the existence of stable, tetratomic bound states. I will
also present our results regarding the creation and observation of these bound
states, whose properties agree very well with parameter-free theory calculations.
Lastly, I will lay out our pathway towards achieving ever colder samples, that
will allow us to explore quantum many-body phenomena like p-wave superfluidity or
the extended Fermi-Hubbard-models. Besides the physical aspect of microwave
shielding, I will also discuss the technical challenges associated with
building and controlling the requisite high-power microwave setups.
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