Excitation spectrum of a condensed bose system

A. R. Knyazev, Yu. A. Nepomnyashchiǐ

Vladimir Sergeevich Yarunin, L. Siurakshina

Vladimir Sergeevich Yarunin

Shingo Otsuka

Jeff Steinhauer, Roee Ozeri, Nadav Y. Katz +1 more

Summary form only given. The excitation spectrum of a Bose-Einstein condensate should give much insight into this system. For wavelengths much shorter than the radius of the condensate, the excitation spectrum is an essentially continuous function, which characterizes the intrinsic bulk properties of the condensate Previously, isolated points on the excitation spectrum and their dependence on the chemical potential were measured We report the first measurement of the excitation spectrum, as well as the static structure factor.

Zhongwen Ouyang, Le‐Man Kuang

We study quantum dynamics of three dressed Bose-Einstein condensates in a high-Q cavity. The quasiparticle excitation spectrum of this system is found numerically. The stability of the quasiparticle excitation is analyzed. It is shown that there exist instabilities in the excitation spectrum.