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The "second sound" is seen in 2D superfluid.


"For the first time, MIT physicists have captured direct images of “second sound,” the movement of heat sloshing back and forth within a superfluid. The results will expand scientists’ understanding of heat flow in superconductors and neutron stars. Credit: Jose-Luis Olivares, MIT"  (ScitechDaily, Superfluid Surprise: MIT Physicists Capture Images of “Second Sound” for the First Time)

That second sound is also one of the reasons why electricity cannot travel in the system forever. Crossing waves decrease each other's energy level. And the second reason is that in waving material. Atoms are not in line. When waves travel in that material some part of the waves or energy travels over another atom or particle. That means there is a power loss in that system because energy travels for magpies. For traveling forever the system requires the ability to transport 100 % of wave movement from transmitting to receiving particles. 


In electric wires some part of heat forms in the cases that atoms or some electrons move backwards. This was the theory until researchers found the "second sound". When atoms or electrons move backward, that thing forms electromagnetic fields or potential barriers in the wire. Those potential barriers transport energy into the internal structures in wires. The electric signal travels at the shell of the wire. The thing that forms those electric fields that create the hall effect is wire can form a second sound. 

Then electrons or other particles turn in opposite directions when radio or electric wave travels through them. That effect forms the standing wave in the electric field that travels on the wire. Then that electric flow will start to pump energy into that Hall field. 

The term "second sound" means that when a soundwave travels in a certain type of material that soundwave rotates those molecules or atoms around. That means that thing forms two ways of traveling soundwave, which is one of the most interesting things in history. This is one thing that can used for energy storage and new types of nanoacoustics. In nanoacoustic systems or nano-tweezers, the system can use the second sound for rising objects. 


In that system the superfluids are put in a shaped structure there are two or four atoms in rows. Those nanotapes are in fullerene nanotubes.  Then system sends sound waves through those nanotapes. And they can used to create new complex nanostructures. 

The things in the nano-world can used to model things in the quantum world.  This effect can used to model things like radar echoes. It's possible to create the material where is walls of one-atom nanolattices. That means the material looks like an extremely small box, which can make things like radar impulses travel out from the shell. 

One of the reasons for the echo is those backward traveling soundwaves. Lots of that echo forms when atoms and particles wobble back and forth. In a superfluid, sound can form, and the lattice can store sound waves as a whirling structure. 

Then that system can release that energy slowly from the particles. And this is one way to store energy. Acoustic waves store energy in the atoms in superfluids in the form of sound waves. That stored energy can released. 

There is a possibility that the single-layer atoms can form box-shaped structures. And that means that the soundwaves can travel in routes that make it impossible to get an echo. Returning soundwaves can used to create a structure that will pull all echoes in it. 

But the 2D atom layers that create the second sound can also used to make pure, high-accurate sound that is targeted in one position. The 2D or single-layer quantum lattice makes it possible to create many things that felt impossible a short time before this. 

Waving 2D atom lattices can be put between graphene layers. And that thing can used to create material where that cannot get radar echo. The waving material is like a mattress. There is an idea. This material can rise to make touch with graphene when radar impulse hits it. Then that waving ion, atom, or anion structure transports energy into itself. Then inside that material, the electronegative particles pull extra energy out from it. 


https://scitechdaily.com/superfluid-surprise-mit-physicists-capture-images-of-second-sound-for-the-first-time/

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