论文摘要
Casimir效应与Bose-Einstein凝聚都是现代物理学研究的重点领域。Casimir效应是一种宏观可观测到的量子涨落效应。Bose-Einstein凝聚是一种低温的物质形态,它被评选为物理学20世纪最伟大的发现之一。Casimir效应与Bose-Einstein凝聚二者之间也有着密切的联系:Bose-Einstein凝聚中存在Casimir效应,同时它对Casimir效应的测量也有很大帮助。在制备Bose-Einstein凝聚体时,会不可避免地掺入杂质。所以杂质在凝聚体中所产生的效应也逐渐被人们关注。A.Oshmyansky提出,在Bose-Einstein凝聚体中的杂质间存在与Casimir力类似的相互作用。在一维理想Bose-Einstein凝聚中,若把杂质看作是凝聚体的边界,则凝聚体的能量与杂质间距离有关。此时,杂质间的相互作用与Casimir力的性质相似,可以称之为类Casimir力。本文研究了五种不同边界下Bose-Einstein凝聚体杂质间的类Casimir力。文章改变以往不同边界条件单独研究的惯例,通过引入参数的方法统一了五种不同边界下波函数的频率形式。利用A.Oshmyansky的理论模型,分别给出了绝对零度和有限温度下,五种边界对应的类Casimir力的通式。结果显示,力与距离和玻色子质量两个因素有关。改变边界条件,类Casimir力的性质也会改变。虽然力随杂质间距离增大而减小的趋势不受边界条件的影响,但是不同边界会影响力随距离衰减的快慢程度。而且,类Casimir力随质量变化的趋势和快慢程度也受边界条件的影响。同时,类Casimir力的大小与温度有关。
论文目录
文章来源
类型: 硕士论文
作者: 邵琼仪
导师: 郑泰玉
关键词: 凝聚,类力,边界条件
来源: 东北师范大学
年度: 2019
分类: 基础科学
专业: 物理学
单位: 东北师范大学
分类号: O469
总页数: 46
文件大小: 1426K
下载量: 15
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