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

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.

Keywords: controllable high-efficiency surface trap cold polar molecules

Received: 18 April 2014
Revised: 23 June 2014
Accepted manuscript online:

PACS:	37.10.Pq	(Trapping of molecules)
	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)

Fund: 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).

Corresponding Authors: Yin Jian-Ping
E-mail: jpyin@phy.ecnu.edu.cn

Cite this article:

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 2014 Chin. Phys. B 23 123701


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

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