期刊
NATURE PHYSICS
卷 17, 期 10, 页码 1144-+出版社
NATURE PORTFOLIO
DOI: 10.1038/s41567-021-01329-6
关键词
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资金
- ARO-MURI
- AFOSR-MURI
- DARPA DRINQS
- NSF QLCI [OMA-2016244]
- NIST
- NSF [1806971]
- FEW2MANY-SHIELD project from Agence Nationale de la Recherche [ANR-17-CE30-0015]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1806971] Funding Source: National Science Foundation
- Agence Nationale de la Recherche (ANR) [ANR-17-CE30-0015] Funding Source: Agence Nationale de la Recherche (ANR)
This study demonstrates tunable elastic dipolar interactions among ultracold polar molecules in three dimensions, facilitated by an electric field-induced shielding resonance that suppresses reactive loss. The thermalization rate is controlled by an external electric field, showing the anisotropic dipolar interaction. Evaporative cooling mediated by dipolar interactions in three dimensions is achieved, paving the way for the study of collective quantum many-body physics.
Ultracold polar molecules possess long-range, anisotropic and tunable dipolar interactions, providing opportunities to probe quantum phenomena that are inaccessible with existing cold gas platforms. However, experimental progress has been hindered by the dominance of two-body loss over elastic interactions, which prevents efficient evaporative cooling. Although recent work has demonstrated controlled interactions by confining molecules to a two-dimensional geometry, a general approach for tuning molecular interactions in a three-dimensional stable system has been lacking. Here we demonstrate tunable elastic dipolar interactions in a bulk gas of ultracold (KRb)-K-40-Rb-87 molecules in three dimensions, facilitated by an electric field-induced shielding resonance that suppresses the reactive loss by a factor of 30. This improvement in the ratio of elastic to inelastic collisions enables direct thermalization. The thermalization rate depends on the angle between the collisional axis and the dipole orientation controlled by an external electric field, a direct manifestation of the anisotropic dipolar interaction. We achieve evaporative cooling mediated by the dipolar interactions in three dimensions. This work demonstrates full control of a long-lived bulk quantum gas system with tunable long-range interactions, paving the way for the study of collective quantum many-body physics.
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