PMID: 11909437Mar 23, 2002Paper

Excitation spectrum of a Bose-Einstein condensate

Physical Review Letters
J SteinhauerN Davidson

Abstract

We report a measurement of the excitation spectrum omega(k) and the static structure factor S(k) of a Bose-Einstein condensate. The excitation spectrum displays a linear phonon regime, as well as a parabolic single-particle regime. The linear regime provides an upper limit for the superfluid critical velocity, by the Landau criterion. The excitation spectrum agrees well with the Bogoliubov spectrum in the local density approximation, even close to the long-wavelength limit of the region of applicability. Feynman's relation between omega(k) and S(k) is verified, within an overall constant.

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Citations

Dec 12, 2013·Scientific Reports·Yu Yi-XiangWu-Ming Liu
Jan 6, 2018·Physical Review Letters·D BaillieP B Blakie
Dec 5, 2017·Nature Materials·Davide CaputoDaniele Sanvitto
May 10, 2016·Scientific Reports·Y LiL Deng
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Mar 9, 2010·Nanotechnology·D SanvittoL Viña
Mar 31, 2015·Physical Review Letters·Si-Cong JiJian-Wei Pan
Jun 6, 2019·Nature Communications·Dmytro A BozhkoBurkard Hillebrands
Aug 29, 2019·Nature Communications·Petr StepanovMaxime Richard
Jul 22, 2015·Physical Review Letters·J H PixleyS Das Sarma
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May 26, 2018·Physical Review Letters·Liangchao ChenJing Zhang
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Jun 8, 2019·Physical Review Letters·C CarcyC J Vale
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Nov 18, 2018·Physical Review Letters·Rukuan Wu, Zhaoxin Liang
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