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Yang H, Li Z, Zhang S, Bohn JL, Cao L, Zhang S, Wang G, Xu H, Li Z. Channel Selection of Ultracold Atom-Molecule Scattering in Dynamic Magnetic Fields. PHYSICAL REVIEW LETTERS 2022; 129:013402. [PMID: 35841560 DOI: 10.1103/physrevlett.129.013402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 05/02/2022] [Accepted: 05/19/2022] [Indexed: 06/15/2023]
Abstract
We demonstrate that final states of ultracold molecules by scattering with atoms can be selectively produced using dynamic magnetic fields of multiple frequencies. We develop a multifrequency Floquet coupled channel method to study the channel selection by dynamic magnetic field control, which can be interpreted by a generalized quantum Zeno effect for the selected scattering channels. In particular, we use an atom-molecule spin-flip scattering to show that the transition to certain final states of the molecules in the inelastic scattering can be suppressed by engineered coupling between the Floquet states.
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Affiliation(s)
- Hanwei Yang
- State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University, Beijing 100871, China
| | - Zunqi Li
- State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University, Beijing 100871, China
| | - Songbin Zhang
- Department of Physics, Shaanxi Normal University, Xi'an 710119, China
| | - John L Bohn
- JILA, University of Colorado, Boulder, Colorado 80309, USA
| | - Lushuai Cao
- MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics, PGMF and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Shutao Zhang
- State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University, Beijing 100871, China
| | - Gaoren Wang
- School of Physics, Dalian University of Technology, Dalian 116024, China
| | - Haitan Xu
- Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
- School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China
| | - Zheng Li
- State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University, Beijing 100871, China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
- Peking University Yangtze Delta Institute of Optoelectronics, Nantong, China
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Ding Y, Pérez-Ríos J, Greene CH. Effective Atom-Molecule Conversions Using Radio Frequency Fields. Chemphyschem 2016; 17:3756-3763. [PMID: 27509888 DOI: 10.1002/cphc.201600646] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Indexed: 11/10/2022]
Abstract
The present study is inspired by the Wieman group experiment [Phys. Rev. Lett. 2005, 95, 190404], in which they use a slow modulated magnetic field to effectively transfer rubidium atoms into cold molecules near a Feshbach resonance. We develop a time-dependent collision theory based on two channel model potentials to study the atom-molecule population transfer induced by a single-color radio frequency field in an ultracold 87 Rb gas. Wave-packet dynamical simulations allow an investigation of both bound-bound transitions and free-bound transitions. The effects of temperature, detuning and the RF amplitude on the population transfer are discussed in detail. Some of our simulations suggest that oscillatory atom-molecule conversion could originate from the long coherence time of the wave packet. This coherence time is unusually long in ultracold gases because the collision energy is typically quite well-defined.
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Affiliation(s)
- Yijue Ding
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN, USA
| | - Jesús Pérez-Ríos
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN, USA
| | - Chris H Greene
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN, USA.,Purdue Quantum Center, West Lafayette, IN, USA
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Smith DH. Induced two-body scattering resonances from a square-well potential with oscillating depth. EPJ WEB OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201611302005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Smith DH. Inducing Resonant Interactions in Ultracold Atoms with a Modulated Magnetic Field. PHYSICAL REVIEW LETTERS 2015; 115:193002. [PMID: 26588376 DOI: 10.1103/physrevlett.115.193002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Indexed: 06/05/2023]
Abstract
In systems of ultracold atoms, pairwise interactions can be resonantly enhanced by a new mechanism that does not rely upon a magnetic Feshbach resonance. In this mechanism, interactions are controlled by tuning the frequency of an oscillating parallel component of the magnetic field close to the transition frequency between the scattering atoms and a two-atom bound state. The real part of the resulting s-wave scattering length a is resonantly enhanced when the oscillation frequency is close to the transition frequency. The resonance parameters can be controlled by varying the amplitude of the oscillating field. The amplitude also controls the imaginary part of a, which arises because the oscillating field converts atom pairs into molecules. The real part of a can be made much larger than the background scattering length without introducing catastrophic atom losses from the imaginary part. For the case of a shallow bound state in the scattering channel, the dimensionless resonance parameters are universal functions of the dimensionless oscillation amplitude.
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Affiliation(s)
- D Hudson Smith
- Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA
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