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

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

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.

Keywords: phase transition point ion crystal structure molecular-dynamics simulation

Received: 25 June 2014
Revised: 10 September 2014
Accepted manuscript online:

PACS:	37.10.Ty	(Ion trapping)
	37.10.Rs	(Ion cooling)
	64.70.kp	(Ionic crystals)

Fund: 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.

Corresponding Authors: Guan Hua
E-mail: guanhua@wipm.ac.cn

Cite this article:

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 2014 Chin. Phys. B 23 123702


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

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