B Quantum Physics and Atomic Physics

Vectronix
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What’s the difference?
I think Atomic physics gets into specific examples and experiments but I think I’m probably wrong. So, I have to ask, what is atomic physics and how is it different than quantum physics?
 
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Quantum Physics (probably) governs the interaction of all things but is most evident for small objects. Atoms are small objects ubiquitous to us.
 
Quantum mechanics was originally developed to understand the structure of atoms, hence historically was also called atomic physics. QM has now evolved beyond considering only atoms, so atomic physics should be seen as a subtopic in the field of quantum mechanics.

Not that atoms play a very important role experimentally in testing many aspects of quantum mechanics.
 
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From the BCS theory of superconductivity is well known that the superfluid density smoothly decreases with increasing temperature. Annihilated superfluid carriers become normal and lose their momenta on lattice atoms. So if we induce a persistent supercurrent in a ring below Tc and after that slowly increase the temperature, we must observe a decrease in the actual supercurrent, because the density of electron pairs and total supercurrent momentum decrease. However, this supercurrent...
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