Infrared behavior of dipolar Bose systems at low temperatures
arXiv:1606.03047 · doi:10.1007/s10909-016-1659-9
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 hydrodynamic approach we calculate the spectrum and damping of low-lying excitations and analyze 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.
8 pages, 3 figures, references added, misprints corrected
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- 2D dilute Bose mixture at low temperatures
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