![]() While exotic superfluids may not fill up our lives (yet), understanding the properties of second wave movement could help questions regarding high-temperature superconductors (again, still at very low temperatures) or the messy physics that lie at the heart of neutron stars.Like any wave, a sound wave doesn't just stop when it reaches the end of the medium or when it encounters an obstacle in its path. This might feel like a big “so what?” After all, when’s the last time you had a close encounter with a superfluid quantum gas? But ask a materials scientist or astronomer, and you’ll get an entirely different answer. This novel technique allowed the researchers to essentially zero in on the “hotter” frequencies (which were still very much cold) and track the resulting second wave over time. warmer temperatures mean higher frequencies, and vice versa). So, MIT scientists designed a way to leverage radio frequencies to track certain subatomic particles known as “lithium-6 fermions,” which can be captured via different frequencies in relation to their temperature (i.e. To finally capture this second sound in action, Zweierlein and his team had to think outside the usual thermal box, as there’s a big problem trying to track heat of an ultracold object-it doesn’t emit the usual infrared radiation.
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