Shulou(Shulou.com)12/24 Report--

CTOnews.com, November 25 (Xinhua) in a recent quantum noise experiment conducted by the scientific team of Rice University in the United States, a "strange metal" quantum material was found to be unusually quiet, which was published in the journal Science this week.

After the team measured the quantum charge fluctuations (also known as shot noise) of the "exotic metal", there was direct evidence that the current appeared to flow through the "exotic metal" in an unusual liquid form that could not be explained by the concept of Quasiparticle.

Image source: Rice University CTOnews.com Note: quasiparticles, also known as collective excitation, in physics, is an emergent phenomenon that occurs in microscopic complex systems, such as solid-state systems that seem to have another virtual particle.

Douglas Natterson (Douglas Natelson), the study's newsletter author, said:

Compared with ordinary wires, the noise of this strange metal is greatly suppressed. This challenges the existing quasiparticle concept, indicating that charge can move in a more complex way, and later we need to find more appropriate words to describe the collective movement of charge.

These experiments are carried out on nanoscale wires of quantum critical materials, and the ratio of ytterbium to rhodium to silicon (YbRh2Si2) is exactly 1-2-2.

The material contains a high degree of quantum entanglement, resulting in a very unusual ("strange") temperature-dependent behavior, which is very different from that of ordinary metals such as silver or gold.

In this common metal, each quasiparticle or discrete unit of an electric charge is the product of inestimable tiny interactions between countless electrons. Quasiparticles were first proposed 67 years ago as a concept used by physicists to express the comprehensive effects of these interactions and are used in quantum mechanics calculations.

Shot noise measurement is basically a way to observe the size of particles when an electric charge passes through something, but this experiment cannot be carried out on a single macrocrystal, but requires nano-sized samples, such as extremely thin but perfectly crystallized films.

The researchers made wires out of a film with a thickness of 1, 000 pieces of human hair, and found that the noise was greatly suppressed compared with ordinary wires.

CTOnews.com attached the reference address of the paper: Liyang Chen etal., Shot noise in a strange metal.Science382907-911 (2023). DOI:10.1126/science.abq6100

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