arXiv subjects

Juhao Wu

Publications and source records attributed to Juhao Wu.

20 records · Page 2Linked to original sources

arXiv1998

Quantum Interference and the Trapped Bose Condensed System

In experiments involving Bose condensed atoms trapped in magnetic bottles, plugging the hole in the bottle potential with a LASER beam produces a new potential with two minima, and thus a condensate order parameter (i.e. wave function) with two maxima. When the trapping potential is removed and the condensate explodes away from the trap, the two wave function maxima act as two coherent sources which exhibit amplitude interference. A simplified theoretical treatment of this experimental effect is provided by considering momentum distributions.

cond-mat.stat-mech↗

arXiv1998

Physical Limits on the Notion of Very Low Temperatures

Standard statistical thermodynamic views of temperature fluctuations predict a magnitude $(\sqrt{<(ΔT)^2>}/T)\approx\sqrt{(k_B/C)}$ for a system with heat capacity $C$. The extent to which low temperatures can be well defined is discussed for those systems which obey the thermodynamic third law in the form $\lim_{(T\to 0)}C=0$. Physical limits on the notion of very low temperatures are exhibited for simple systems. Application of these concepts to bound Bose condensed systems are explored, and the notion of bound Boson superfluidity is discussed in terms of the thermodynamic moment of inertia.

cond-mat.stat-mech↗