Adiabatic cooling for cold polar molecules on a chip using a controllable high-efficiency electrostatic surface trap

doi:10.1088/1674-1056/23/12/123701

›› 2014, Vol. 23 ›› Issue (12): 123701-123701.doi: 10.1088/1674-1056/23/12/123701

• ATOMIC AND MOLECULAR PHYSICS • 上一篇下一篇

Adiabatic cooling for cold polar molecules on a chip using a controllable high-efficiency electrostatic surface trap

李胜强, 许亮, 夏勇, 汪海玲, 印建平

State Key Laboratory of Precision Spectroscopy, Department of Physics, East China Normal University, Shanghai 200062, China

收稿日期:2014-04-18 修回日期:2014-06-23 出版日期:2014-12-15 发布日期:2014-12-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 10674047, 10804031, 10904037, 10904060, 10974055, 11034002, and 61205198), the National Key Basic Research and Development Program of China (Grant Nos. 2006CB921604 and 2011CB921602), the Basic Key Program of Shanghai Municipality, China (Grant No. 07JC14017), the Fundamental Research Funds for the Central Universities, and the Shanghai Leading Academic Discipline Project, China (Grant No. B408).

Adiabatic cooling for cold polar molecules on a chip using a controllable high-efficiency electrostatic surface trap

Li Sheng-Qiang (李胜强), Xu Liang (许亮), Xia Yong (夏勇), Wang Hai-Ling (汪海玲), Yin Jian-Ping (印建平)

State Key Laboratory of Precision Spectroscopy, Department of Physics, East China Normal University, Shanghai 200062, China

Received:2014-04-18 Revised:2014-06-23 Online:2014-12-15 Published:2014-12-15
Contact: Yin Jian-Ping E-mail:jpyin@phy.ecnu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 10674047, 10804031, 10904037, 10904060, 10974055, 11034002, and 61205198), the National Key Basic Research and Development Program of China (Grant Nos. 2006CB921604 and 2011CB921602), the Basic Key Program of Shanghai Municipality, China (Grant No. 07JC14017), the Fundamental Research Funds for the Central Universities, and the Shanghai Leading Academic Discipline Project, China (Grant No. B408).

摘要/Abstract

摘要： We propose a controllable high-efficiency electrostatic surface trap for cold polar molecules on a chip by using two insulator-embedded charged rings and a grounded conductor plate. We calculate Stark energy structure pattern of ND₃ molecules in an external electric field using the method of matrix diagonalization. We analyze how the voltages that are applied to the ring electrodes affect the depth of the efficient well and the controllability of the distance between the trap center and the surface of the chip. To obtain a better understanding, we simulate the dynamical loading and trapping processes of ND₃ molecules in a|J, KM>=|1, -1> state by using classical Monte–Carlo method. Our study shows that the loading efficiency of our trap can reach ～ 88%. Finally, we study the adiabatic cooling of cold molecules in our surface trap by linearly lowering the potential-well depth (i.e., lowering the trapping voltage), and find that the temperature of the trapped ND₃ molecules can be adiabatically cooled from 34.5 mK to ～ 5.8 mK when the trapping voltage is reduced from -35 kV to -3 kV.

关键词: controllable, high-efficiency, surface trap, cold polar molecules

Abstract: We propose a controllable high-efficiency electrostatic surface trap for cold polar molecules on a chip by using two insulator-embedded charged rings and a grounded conductor plate. We calculate Stark energy structure pattern of ND₃ molecules in an external electric field using the method of matrix diagonalization. We analyze how the voltages that are applied to the ring electrodes affect the depth of the efficient well and the controllability of the distance between the trap center and the surface of the chip. To obtain a better understanding, we simulate the dynamical loading and trapping processes of ND₃ molecules in a|J, KM>=|1, -1> state by using classical Monte–Carlo method. Our study shows that the loading efficiency of our trap can reach ～ 88%. Finally, we study the adiabatic cooling of cold molecules in our surface trap by linearly lowering the potential-well depth (i.e., lowering the trapping voltage), and find that the temperature of the trapped ND₃ molecules can be adiabatically cooled from 34.5 mK to ～ 5.8 mK when the trapping voltage is reduced from -35 kV to -3 kV.

Key words: controllable, high-efficiency, surface trap, cold polar molecules

中图分类号: (Trapping of molecules)

37.10.Pq

37.10.Mn (Slowing and cooling of molecules) 37.10.Vz (Mechanical effects of light on atoms, molecules, and ions) 37.20.+j (Atomic and molecular beam sources and techniques)

李胜强, 许亮, 夏勇, 汪海玲, 印建平. Adiabatic cooling for cold polar molecules on a chip using a controllable high-efficiency electrostatic surface trap[J]. , 2014, 23(12): 123701-123701.

Li Sheng-Qiang (李胜强), Xu Liang (许亮), Xia Yong (夏勇), Wang Hai-Ling (汪海玲), Yin Jian-Ping (印建平). Adiabatic cooling for cold polar molecules on a chip using a controllable high-efficiency electrostatic surface trap[J]. Chin. Phys. B, 2014, 23(12): 123701-123701.

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Adiabatic cooling for cold polar molecules on a chip using a controllable high-efficiency electrostatic surface trap

Adiabatic cooling for cold polar molecules on a chip using a controllable high-efficiency electrostatic surface trap

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