I have basic understanding of BEC - if you can call it understanding -, and I did a lot of reading to get it, but I never came across any examples other than liquid helium. Is it theoretically possible to achieve BEC state with any other material? If not, what am I missing?
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Yes. Bose-Einstein condensation was experimentally achieved in systems of:
- Rubidium atoms (first experimental realization, 2001 Nobel prize)
- Potassium atoms
- Cesium atoms
- Lithium atoms
- Sodium atoms
- Exciton polaritons
- Photons
- Phonons (?)
If you are using atoms, they must behave like bosons (see also here).
