Determining the structural phase transition point from the temperature of 40Ca+ Coulomb crystal

doi:10.1088/1674-1056/23/12/123702

›› 2014, Vol. 23 ›› Issue (12): 123702-123702.doi: 10.1088/1674-1056/23/12/123702

• ATOMIC AND MOLECULAR PHYSICS • 上一篇下一篇

Determining the structural phase transition point from the temperature of ⁴⁰Ca⁺ Coulomb crystal

陈婷^{a b c}, 杜丽军^{a b c}, 宋红芳^{a b c}, 刘培亮^{a b c}, 黄垚^{a b}, 童昕^{a b}, 管桦^{a b}, 高克林^{a b}

a State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;
b Key Laboratory of Atomic Frequency Standards, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;
c University of Chinese Academy of Sciences, Beijing 100049, China

收稿日期:2014-06-25 修回日期:2014-09-10 出版日期:2014-12-15 发布日期:2014-12-15
基金资助:
Project supported by the National Basic Research Program of China (Grant Nos. 2010CB832803 and 2012CB821301), the National Natural Science Foundation of China (Grant Nos. 11004222 and 91121016), and the Chinese Academy of Sciences.

Determining the structural phase transition point from the temperature of ⁴⁰Ca⁺ Coulomb crystal

Chen Ting (陈婷)^{a b c}, Du Li-Jun (杜丽军)^{a b c}, Song Hong-Fang (宋红芳)^{a b c}, Liu Pei-Liang (刘培亮)^{a b c}, Huang Yao (黄垚)^{a b}, Tong Xin (童昕)^{a b}, Guan Hua (管桦)^{a b}, Gao Ke-Lin (高克林)^{a b}

a State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;
b Key Laboratory of Atomic Frequency Standards, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;
c University of Chinese Academy of Sciences, Beijing 100049, China

Received:2014-06-25 Revised:2014-09-10 Online:2014-12-15 Published:2014-12-15
Contact: Guan Hua E-mail:guanhua@wipm.ac.cn
Supported by:
Project supported by the National Basic Research Program of China (Grant Nos. 2010CB832803 and 2012CB821301), the National Natural Science Foundation of China (Grant Nos. 11004222 and 91121016), and the Chinese Academy of Sciences.

摘要/Abstract

摘要： We observed the linear-to-zigzag structural phase transition of a ⁴⁰Ca⁺ crystal in a homemade linear Paul trap. The values of the total temperature of the ion crystals during the phase transition are derived using the molecular-dynamics (MD) simulation method. A series of simulations revealed that the ratio of the radial to axial secular frequencies has a dependence on the total temperature that obeys different functional forms for linear and zigzag structures, and the transition point occurs where these functions intersect; thus, the critical value of the ratio of secular frequencies that drives the structure phase transition can be derived.

关键词: phase transition point, ion crystal structure, molecular-dynamics simulation

Abstract: We observed the linear-to-zigzag structural phase transition of a ⁴⁰Ca⁺ crystal in a homemade linear Paul trap. The values of the total temperature of the ion crystals during the phase transition are derived using the molecular-dynamics (MD) simulation method. A series of simulations revealed that the ratio of the radial to axial secular frequencies has a dependence on the total temperature that obeys different functional forms for linear and zigzag structures, and the transition point occurs where these functions intersect; thus, the critical value of the ratio of secular frequencies that drives the structure phase transition can be derived.

Key words: phase transition point, ion crystal structure, molecular-dynamics simulation

中图分类号: (Ion trapping)

37.10.Ty

37.10.Rs (Ion cooling) 64.70.kp (Ionic crystals)

陈婷, 杜丽军, 宋红芳, 刘培亮, 黄垚, 童昕, 管桦, 高克林. Determining the structural phase transition point from the temperature of ⁴⁰Ca⁺ Coulomb crystal[J]. , 2014, 23(12): 123702-123702.

Chen Ting (陈婷), Du Li-Jun (杜丽军), Song Hong-Fang (宋红芳), Liu Pei-Liang (刘培亮), Huang Yao (黄垚), Tong Xin (童昕), Guan Hua (管桦), Gao Ke-Lin (高克林). Determining the structural phase transition point from the temperature of ⁴⁰Ca⁺ Coulomb crystal[J]. Chin. Phys. B, 2014, 23(12): 123702-123702.

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Determining the structural phase transition point from the temperature of ⁴⁰Ca⁺ Coulomb crystal

Determining the structural phase transition point from the temperature of ⁴⁰Ca⁺ Coulomb crystal

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