Optoelectrical cooling of polar molecules to sub-millikelvin temperatures

Abstract

We demonstrate direct cooling of gaseous formaldehyde (H2CO) to the microkelvin regime. Our approach, optoelectrical Sisyphus cooling, provides a simple dissipative cooling method applicable to electrically trapped dipolar molecules. By reducing the temperature by three orders of magnitude and increasing the phase-space density by a factor of ~$10^4$ we generate an ensemble of $3\cdot 10^5$ molecules with a temperature of about 420μK, populating a single rotational state with more than 80% purity.

References in corpus (11)

• Many-Body Physics with Ultracold Gases
• A High Phase-Space-Density Gas of Polar Molecules
• Magneto-optical trapping of a diatomic molecule
• Using Molecules to Measure Nuclear Spin-Dependent Parity Violation
• Sisyphus Cooling of Electrically Trapped Polyatomic Molecules
• Sub-millikelvin dipolar molecules in a radio-frequency magneto-optical trap
• Electrostatic extraction of cold molecules from a cryogenic reservoir
• Realizing unconventional quantum magnetism with symmetric top molecules
• Opto-Electrical Cooling of Polar Molecules
• Rotational cooling of trapped polyatomic molecules
• Preparation of an ultra-cold sample of ammonia molecules for precision measurements

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• Characterizing the Zeeman slowing force for ${}^{40}$Ca${}^{19}$F molecules
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