Selecting resonances in molecular scattering by anti-Zeno effect

Hanwei Yang; Zunqi Li; Songbin Zhang; Lushuai Cao; Zeji Zhang; Sizhe Li; Gaoren Wang; Haitan Xu; Zheng Li

doi:10.1063/5.0144665

Selecting resonances in molecular scattering by anti-Zeno effect

J Chem Phys. 2023 Apr 21;158(15):154302. doi: 10.1063/5.0144665.

Authors

Hanwei Yang¹, Zunqi Li¹, Songbin Zhang², Lushuai Cao³, Zeji Zhang^{1

4}, Sizhe Li⁵, Gaoren Wang⁶, Haitan Xu^{7

8}, Zheng Li^{1

9

10}

Affiliations

¹ State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University, Beijing 100871, China.
² Department of Physics, Shaanxi Normal University, Xi'an, Shaanxi 710119, China.
³ Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.
⁴ Yuanpei School, Peking University, Beijing 100871, China.
⁵ College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
⁶ School of Physics, Dalian University of Technology, Dalian, Liaoning 116081, China.
⁷ School of Materials Science and Intelligent Engineering, Nanjing University, Suzhou, Jiangsu 215163, China.
⁸ School of Physical Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China.
⁹ Shishan Laboratory, Nanjing University, Suzhou, Jiangsu 215163, China.
¹⁰ Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China.

PMID: 37094015
DOI: 10.1063/5.0144665

Abstract

Utilizing the anti-Zeno effect, we demonstrate that the resonances of ultracold molecular interactions can be selectively controlled by modulating the energy levels of molecules with a dynamic magnetic field. We show numerically that the inelastic scattering cross section of the selected isotopic molecules in the mixed isotopic molecular gas can be boosted for 2-3 orders of magnitude by modulation of Zeeman splittings. The mechanism of the resonant anti-Zeno effect in the ultracold scattering is based on matching the spectral modulation function of the magnetic field with the Floquet-engineered resonance of the molecular collision. The resulting insight provides a recipe to implement resonant anti-Zeno effect in control of molecular interactions, such as the selection of reaction channels between molecules involving shape and Feshbach resonances, and external field-assisted separation of isotopes.