| Issue |
EPL
Volume 90, Number 2, April 2010
|
|
|---|---|---|
| Article Number | 26004 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Structural, Mechanical and Thermal Properties | |
| DOI | https://doi.org/10.1209/0295-5075/90/26004 | |
| Published online | 14 May 2010 | |
Thermal conductivity and viscosity of a Bose gas above superfluid transition
T.C.M. Group, Cavendish Laboratory - J.J. Thomson Avenue, Cambridge, CB3 0HE, UK, EU
Corresponding author: wk219@cam.ac.uk
Received:
19
January
2010
Accepted:
12
April
2010
The thermal fluctuations of the order parameter affect the transport of Bose gas above the superfluid transition. Using the time-dependent Ginzburg-Landau theory in the classical region, we calculate the fluctuation corrections to the coefficients of thermal conductivity and shear viscosity. Above the transition temperature Tc, the fluctuation contribution to the thermal conductivity diverges as 
for dimensions d. The viscosity drops near Tc since the fluctuation contributes a correction which varies as 
. The calculations are conducted under the condition that the fluctuation corrections are small compared with the normal part of the transport coefficients.
PACS: 67.10.Jn – Transport properties and hydrodynamics / 74.40.Kb – Quantum critical phenomena / 74.40.-n – Fluctuation phenomena
© EPLA, 2010
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