Liquid Helium-3 as a Quantum Acoustic Metamaterial

Acoustic metamaterials exhibit interesting properties through manipulation of the density and bulk modulus. We propose liquid Helium-3 as a candidate for an acoustic metamaterial. We show this by exploiting properties of the collective sound modes, which with a specified forcing function can allow us to control the density response function. Furthermore, we will utilize the viscoelastic nature of liquid Helium-3, which introduces an anisotropy that is unique in liquids(Bedell, K., Pethick, C.J. J. Low Temp. Phys. 49, 213 (1982).). This provides us with an additional way to explore enhanced absorption and negative-index regions in Helium-3. We will explore this behavior at various temperature and density ranges.