Billions of quantum twisted electrons are found in foreign metals, In a new study, physicists observe the quantum attachment of billions of electrons flowing in critical-quantum matter. Electronic and magnetic behavior investigations of strange metal compounds made of ytterbium, rhodium and silicon approach and undergo a critical transition between two well-studied quantum phases.
When we think of quantum attachments, we think of little things that researchers say. We do not associate it with macroscopic objects. But in a quantum critical moment, things are so collective that we have the opportunity to see the effects of attachment, even in metal films containing billions of billions of quantum mechanical objects.
For more than two decades, physicists have been researching what happens when materials such as strange metals and high-temperature superconductors change quantum phases.
A better understanding of the material can open doors to new technologies in computer technology, communication, and more. Researchers have developed a highly sophisticated technique for the synthesis of materials for the production of ultra-pure films containing one part ytterbium for two parts rhodium and silicon (YbRh2Si2). At absolute zero, matter undergoes a transition from one quantum phase that forms one magnetic order to another that does not.
conducted a terahertz spectroscopic experiment with films at 1.4 Kelvin. The terahertz measurements show the optical conductivity of YbRh2Si2 films when they are cooled to a quantum critical point, which marks the transition from one quantum phase to another. With strange metals there is an unusual connection between electrical resistance and temperature.
Unlike simple metals such as copper or gold, this does not seem to be caused by the thermal movement of atoms, but because of quantum vibrations at absolute zero temperature.
To measure optical conductivity, Li illuminates coherent electromagnetic radiation in the terahertz frequency range above the film and analyzes the amount of terahertz rays transmitted as a function of frequency and temperature. The experiments show the temperature scaling frequency, an indication of quantum criticality.
Less than 0.1% of the total terahertz radiation is transmitted, and the signal, which represents a change in conductivity as a function of frequency, is several percent more.
Making films is even more difficult. To make it so thin that they can transmit terahertz rays, the team at the Vienna University of Technology has developed a unique epitaxial molecular beam system and a sophisticated growth process. Ytterbium, rhodium and silicon are evaporated simultaneously from separate sources in an appropriate 1-2-2 ratio.
Because of the high energy requirements for rhodium and silicon evaporation, this system requires a customer-specific ultra-high vacuum chamber with two electron beam evaporators.
Researchers more than 15 years ago tested ways to test a new class of quantum-critical points. A distinctive feature of the quantum critical point that they pursue with colleagues is that the quantum attachment between rotation and charge is very important. At a critical point in magnetic quantum, conventional wisdom determines that only the rotational sector will be critical.
Conceptually, it is a dream experiment. Test the charge sector at a magnetic quantum critical point to determine whether there is dynamic scaling or not. If you don’t see something scaling, the critical point must be part of the textbook description.
But if you look at the only thing we really do, this is very direct and new evidence about the nature of quantum entanglement from quantum criticality. At the same time, it is assumed that quantum criticality leads to high-temperature superconductivity. So our results show that the same basic physical quantum criticality can lead to platforms for quantum information and high-temperature superconductivity. When you consider this possibility, you cannot be surprised by the wonders of nature.