Mixing two different BE condensates

[Gonzolo]

Has anyone ever tried mixing two different BE condensates? Do they keep their superfluid states? Can they interfere with other? Which other material can be superfluid besides Helium anyway?

 

[Claude Bile]

I did a course on Optical cooling recently, and yes, two independant BE condensates, when collided exhibit interference patterns, the same as one would observe from two coherent sources of light.

Lots of materials can be BE condensates, provided they obey BE statistics of course. The most popular isotope (from the materials we were given) was Rubidium-87.

Just a note, I don't think the terms BE condensate and superfluid can be used interchangably, someone may be able to confirm this, but I am fairly sure this is the case.

Claude.