A The most striking example of vacuum fluctuations affecting experiments

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The discussion centers on the impact of vacuum fluctuations in quantum field theory (QFT) on experimental results in condensed matter physics. Participants recall studies related to quantum criticality in cuprate superconductors, where experimental outcomes deviated from classical predictions due to electron interactions with the vacuum state. There is a request for specific examples and publications that illustrate these phenomena, as the original poster has lost their references. The conversation highlights the importance of understanding vacuum fluctuations in explaining complex quantum behaviors. Overall, the thread seeks to gather insights and resources on this intriguing aspect of quantum physics.
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What do you think is the most striking example of vacuum fluctuations affecting the results of an experiment?
This is a question for experimentalists working in Condensed Matter Physics. What do you think is the most striking example of QFT vacuum state fluctuations affecting the results of an experiment?

I have vague memory of reviewing some abstracts about quantum criticality in cuprate superconductors. The results were differing from classical predictions in ways explained by electron interactions with the vacuum. But I have since lost all my links to them. Would be happy to see what you have.
 
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Yeah that's fine and all. I'm looking for some examples of how the vacuum state plays a role in quantum criticality. I remember reading publications about cuprate superconductors from peer-reviewed journals. I just have lost all of my notes and bookmarks in the hustle-bustle of life over the years. I was just wondering if anyone on the forum has any of those kinds of experiments "at their fingertips".
 

Thread 'Stability of persistent currents in superconductors regardless of temperature'

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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