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

作　　者：陈婷 杜丽军 宋红芳 刘培亮 黄垚 童昕 管桦 高克林 

机构地区：[1]State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics,Chinese Academy of Sciences [2]Key Laboratory of Atomic Frequency Standards, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences [3]University of Chinese Academy of Sciences

出　　处：《Chinese Physics B》2014年第12期155-158,共4页中国物理B（英文版）

基　　金：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);the Chinese Academy of Sciences

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.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 

分 类 号：O76[理学—晶体学]