Asymmetric top M-NH2 molecules are shown to offer long-lived ground-state parity doublets and engineered clock transitions that project electron EDM sensitivity beyond current limits.
Photon Cycling and Laser Cooling of an Asymmetric Top Molecule
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abstract
We realize two-dimensional magnetically-assisted Sisyphus laser cooling of an asymmetric top molecule (ATM), calcium monoamide (CaNH$_2$). Vibrational state closure is achieved with $41.1 \pm 6.3$ photons scatters using optical pumping of the $X[3_1]$ state. Photon-cycling measurements show good agreement with branching ratios determined by dispersed fluorescence spectroscopy. Rotational closure is maintained by driving the $X[1_{11}] \to A [0_{00}]$ transition. The observed absence of additional state leakage channels broadens the scope of molecular laser cooling to include ATMs, which are the most general geometric class of molecules and possess the richest internal structure. Future applications of quantum controlled ATMs include new quantum information platforms and searches for physics beyond the Standard Model.
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physics.atom-ph 1years
2026 1verdicts
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Probing $P,T$-Symmetry Violation with Optically Trapped Asymmetric Top Molecules
Asymmetric top M-NH2 molecules are shown to offer long-lived ground-state parity doublets and engineered clock transitions that project electron EDM sensitivity beyond current limits.