论文摘要
基于装载在六角可调光晶格中的超冷原子气体,研究了无质量狄拉克准粒子的动力学行为.此系统具有与石墨烯类似的能带结构,即在简并点附近满足线性色散关系.分别运用解析求解海森堡运动方程和数值波包动力学的方法,得到了准粒子质心位置.文中可视化地展示了准粒子在不同宽度能隙处的演化行为,发现准粒子的运动并没有出现相对论Zitterbewegung现象.此外,研究了有效光速、Dirac旋量对系统动力学演化的影响.结果表明:波包的演化方式取决于初态Dirac旋子的形式,而运动速度只依赖于有效光速.由于光晶格超冷原子系统具有纯净和高可操控性等优点,文中研究成果有望在超冷原子体系实验中得到验证.
论文目录
文章来源
类型: 期刊论文
作者: 黄肖健,许文刚,廖开宇,黄巍,李志
关键词: 量子模拟,相对论动力学,超冷量子气体
来源: 华南师范大学学报(自然科学版) 2019年02期
年度: 2019
分类: 基础科学,工程科技Ⅰ辑
专业: 物理学,化学
单位: 华南师范大学物理与电信工程学院
基金: 国家自然科学基金项目(11704132),中国博士后科学基金面上项目(2018M633063)
分类号: O734
页码: 7-13
总页数: 7
文件大小: 3828K
下载量: 58
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