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Journal of Low Temperature Physics

, Volume 186, Issue 1–2, pp 148–162 | Cite as

Infrared Behavior of Dipolar Bose Systems at Low Temperatures

  • Volodymyr Pastukhov
Article

Abstract

We rigorously discuss the infrared behavior of the uniform three-dimensional dipolar Bose systems. In particular, it is shown that low-temperature physics of the system is controlled by two parameters, namely isothermal compressibility and intensity of the dipole–dipole interaction. By using a hydrodynamic approach, we calculate the spectrum and damping of low-lying excitations and analyze the infrared behavior of the one-particle Green’s function. The low-temperature corrections to the anisotropic superfluid density as well as condensate depletion are found. Additionally, we derive equations of the two-fluid hydrodynamics for dipolar Bose systems and calculate velocities of first and second sound.

Keywords

Dipolar Bose system Beliaev and Landau damping Two-fluid hydrodynamics 

Notes

Acknowledgments

We thank Prof. I. Vakarchuk and Dr. A. Rovenchak for stimulating discussions. This work was partly supported by Project FF-30F (No. 0116U001539) from the Ministry of Education and Science of Ukraine.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Department for Theoretical PhysicsIvan Franko National University of LvivLviv-5Ukraine

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