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Establishing a nearly closed cycling transition in a polyatomic molecule

https://doi.org/10.1103/PhysRevA.103.043111

Baum, Louis; Vilas, Nathaniel B.; Hallas, Christian; Augenbraun, Benjamin L.; Raval, Shivam; Mitra, Debayan; Doyle, John M. (April 2021, Physical Review A)

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1D Magneto-Optical Trap of Polyatomic Molecules

https://doi.org/10.1103/PhysRevLett.124.133201

Baum, Louis; Vilas, Nathaniel B.; Hallas, Christian; Augenbraun, Benjamin L.; Raval, Shivam; Mitra, Debayan; Doyle, John M. (March 2020, Physical Review Letters)

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Coherent Bichromatic Force Deflection of Molecules

https://doi.org/10.1103/PhysRevLett.120.063205

Kozyryev, Ivan; Baum, Louis; Aldridge, Leland; Yu, Phelan; Eyler, Edward E.; Doyle, John M. (February 2018, Physical Review Letters)
Direct laser cooling of a symmetric top molecule

https://doi.org/10.1126/science.abc5357

Mitra, Debayan; Vilas, Nathaniel B.; Hallas, Christian; Anderegg, Loïc; Augenbraun, Benjamin L.; Baum, Louis; Miller, Calder; Raval, Shivam; Doyle, John M. (September 2020, Science)

Ultracold polyatomic molecules have potentially wide-ranging applications in quantum simulation and computation, particle physics, and quantum chemistry. For atoms and small molecules, direct laser cooling has proven to be a powerful tool for quantum science in the ultracold regime. However, the feasibility of laser-cooling larger, nonlinear polyatomic molecules has remained unknown because of their complex structure. We laser-cooled the symmetric top molecule calcium monomethoxide (CaOCH₃), reducing the temperature of ~10⁴molecules from 22 ± 1 millikelvin to 1.8 ± 0.7 millikelvin in one dimension and state-selectively cooling two nuclear spin isomers. These results demonstrate that the use of proper ro-vibronic transitions enables laser cooling of nonlinear molecules, thereby opening a path to efficient cooling of chiral molecules and, eventually, optical tweezer arrays of complex polyatomic species.
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