Roton instabilities and correlated Wigner crystals of rotating dipolar fermions in the fractional quantum Hall regime

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Title:	Roton instabilities and correlated Wigner crystals of rotating dipolar fermions in the fractional quantum Hall regime
Authors:	Jheng, SD (Jheng, Shih-Da) Jiang, TF (Jiang, T.F.) Cheng, SC (Cheng, Szu-Cheng)
Contributors:	Dept Phys
Keywords:	GASES
Date:	2013-11-04
Issue Date:	2014-02-24 10:28:51 (UTC+8)
Abstract:	We point out that the Wigner crystal (WC) state of rotating dipolar fermions in the lowest Landau level is strongly correlated. From intra-Landau-level excitations of the fractional quantum Hall effect (FQHE) liquid, we find that the roton minimum of the excitation spectrum at. nu = 1/7 becomes negative, indicating an absence of the FQHE state, which is supposed to be the ground state of the system. Therefore, we show that the Hartree-Fock theory of the WC does not predict the correct ground-state energy in the lowest Landau level. There exists a strong correlation effect on the Wigner crystallization of rotating dipolar gases.
Relation:	PHYSICAL REVIEW A Volume: 88 Issue: 5 Article Number: 051601
Appears in Collections:	[Department of Physics ] journal articles

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