The thermal conductivity of a trapped Bose-condensed gas

✍ Scribed by M.A. Shahzamanian; H. Yavary

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 206 KB
• Volume: 352
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2004.06.058

✦ Synopsis

The thermal conductivity of a trapped Bose condensed gas is calculated by using the Kubo formula approach. By evaluating the appropriate self-energies of the system the thermal relaxation time is calculated. Below the Bose-Einstein condensation temperature in addition to the relaxation time due to collision between non-condensate atoms (t 22 ) we include the contribution from the interaction between condensate and non-condensate atoms (t 12 ) in the thermal relaxation time. In a trapped Bose gas the contribution of the relaxation time (t 12 ) is always important, since the condensate density at the central region of a trap is much larger than the density of the thermal cloud even at temperatures near the transition temperature. Above the Bose-Einstein condensation temperature the only term present is t 22 and the normal thermal conductivity coefficient is obtained.