- #1
nonequilibrium
- 1,439
- 2
Hello, I have to do a basic presentation about BEC (for a course on "Scientific Communication") and I had a question or two:
How come there are many youtube clips of superfluidity and none of BECs? Is it wrong to consider superfluid 4He as a weakly-interacting BEC? (as I understand, a BEC is actually only applicable for an ideal (quantum) gas? But the theory was broadened to weakly interacting systems?) This is what I read anyway, but I see the cooling temperatures are also much lower for BECs, or is that just for the ideal gas-type BECs?
Also, is it possible to create superfluid H20? (as its spin adds up to an integer?)
And is the thought process of creating a BEC (for 4HE) the following: we cool the atoms down, the wave function for each 4HE gets bigger (due to momentum -> 0), and due to the sum of the spin of an atom being an integer, each atom is beginning to look like the wave function of a boson, and then all the atoms can fall into each other due to properties of bosons?
(if so, why doesn't it work for atoms with spin-sum of half an integer on the condition that the number of atoms is even, so that the total spin-sum is again an integer?)
Thank you!
How come there are many youtube clips of superfluidity and none of BECs? Is it wrong to consider superfluid 4He as a weakly-interacting BEC? (as I understand, a BEC is actually only applicable for an ideal (quantum) gas? But the theory was broadened to weakly interacting systems?) This is what I read anyway, but I see the cooling temperatures are also much lower for BECs, or is that just for the ideal gas-type BECs?
Also, is it possible to create superfluid H20? (as its spin adds up to an integer?)
And is the thought process of creating a BEC (for 4HE) the following: we cool the atoms down, the wave function for each 4HE gets bigger (due to momentum -> 0), and due to the sum of the spin of an atom being an integer, each atom is beginning to look like the wave function of a boson, and then all the atoms can fall into each other due to properties of bosons?
(if so, why doesn't it work for atoms with spin-sum of half an integer on the condition that the number of atoms is even, so that the total spin-sum is again an integer?)
Thank you!