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| 玻色超流体中的准粒子激发与稳定性 | |
| 引用本文： | 贺丽. 玻色超流体中的准粒子激发与稳定性[J]. 江苏科技大学学报(社会科学版), 2014, 0(2): 201-204 |
| 作者姓名： | 贺丽 |
| 作者单位： | 江苏科技大学张家港校区基础教学部,江苏张家港215600 |
| 基金项目： | 江苏科技大学苏州理工学院2014青年教师科研专项基金（128111404） |
| 摘 要： | 利用博戈留波夫方法计算了流动状态下玻色系统的准粒子激发谱，根据色散关系的正定性要求给出了超流的稳定性条件。当体系具有伽利略不变性时，该条件即等价于通常的朗道判据。通过具体模型的实例，分别计算了在伽利略不变性被满足与被破坏两种不同情形下的超流临界速度。 |
| 关 键 词： | 超流 临界速度 朗道判据 |
Quasi-particle excitations and stability in a Bosonic superfluid |
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| He Li. Quasi-particle excitations and stability in a Bosonic superfluid[J]. Journal of Jiangsu University of Science and Technology(Natural Science Edition), 2014, 0(2): 201-204 | |
| Authors: | He Li |
| Affiliation: | He Li (Department of Basic Course,Zhangjiagang Campus,Jiangsu University of Science and Technology,Zhangjiagang Jiangsu 215600 ,China) |
| Abstract: | Quasi-particle excitations in a bosonic superfluid are calculated via Bogoliubov approach for a general Hamiltonian.The stability condition for superfluidity is derived according to the requirement that the energy disper-sion be definite positive.Such a condition is equivalent to Landau criterion when the system is Galilean invariant. The critical velocity of the superfluid is obtained for the specific models in which Galilean invariance is either satis-fied or violated. |
| Keywords: | superfluidity critical velocity Landau criterion |
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