Correlation effect on the roton minimum of the rotating dipolar Fermi gas

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题名:	Correlation effect on the roton minimum of the rotating dipolar Fermi gas
作者:	Wu, Jing-Nuo Chiang, Yu-Ling Huang, Hsin-Chien Cheng, Szu-Cheng
贡献者:	物理系
关键词:	EQUATIONS;MOTION 2-DIMENSIONAL ELECTRON-GAS RANDOM-PHASE-APPROXIMATION COLLECTIVE EXCITATIONS CYCLOTRON-RESONANCE
日期:	2011-12-28
上传时间:	2012-08-30 15:16:35 (UTC+8)
摘要:	The collective-excitation spectrum from a filled Landau level in a rotating dipolar Fermi gas is investigated through the equation of motion method. The predicted excitation spectrum exhibits a roton structure which is affected by the strength of dipolar interactions and trapping potential. The correlation effect on the roton minimum is observed by varying the dipolar interaction strength. An increase of the dipolar interaction strength leads to a deeper roton minimum. The roton minimum can even become zero, where the system exhibits instability, as the dipolar strength approaches a critical value. As the dynamical stability of the system is studied through the roton structure, we find that this zero-value roton minimum is a precursor of the occurrence of a bubble crystal.
關聯:	JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS Volume: 44 Issue: 24 Article Number: 245301
显示于类别:	[光電物理系] 期刊論文

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