Lu Li, a physicist at the University of Michigan, studies advanced materials. His work often uncovers strange phenomena that might not have immediate practical applications but offer fascinating insights into the universe.
Li recently collaborated with an international team on a groundbreaking discovery. In a study published in Physical Review Letters, they explored a puzzling phenomenon called quantum oscillations. These oscillations occur in metals when electrons act like tiny springs, vibrating in reaction to magnetic fields. Adjusting the magnetic field changes the speed of these “electron springs.”
What’s surprising is that scientists have also found these oscillations in insulators—materials that should not conduct electricity or heat. This raises questions about whether the oscillations happen at the surface or deep inside the material.
If the oscillations are indeed surface-based, that could lead to advancements in technology. Topological insulators, which conduct electricity only on their surfaces while remaining insulating inside, are currently being studied for their potential in electronic and quantum devices.
To investigate further, Li and his team utilized the powerful magnets at the National Magnetic Field Laboratory. Their experiments showed that these oscillations came from the bulk of the material—not just the surface.
“We have evidence of an exciting phenomenon,” Li noted. “We don’t yet know how to harness this, but the discovery is significant.”
The research included over a dozen scientists from institutions in the U.S. and Japan. Kuan-Wen Chen, a research fellow, emphasized the importance of their findings: “We’ve provided clear evidence that the oscillations originate from the bulk and are intrinsic to the material.”
Li describes this work as part of what he calls a “new duality” in physics. Historically, scientists discovered that light and matter can behave as both waves and particles. This “old” duality led to advancements like solar cells. The “new duality” suggests that some materials can act as both conductors and insulators. Li’s team investigated this using a compound called ytterbium boride (YbB12) in a powerful 35-Tesla magnetic field—remarkably stronger than typical MRI machines.
Li explained, “We thought of a surface with good conduction for electronics. It turns out the entire compound behaves like a metal, even though it’s categorized as an insulator.” This revelation has sparked new questions about material behavior on a quantum level.
Yuan Zhu, one of the graduate students involved, expressed excitement about confirming the oscillations’ intrinsic nature. However, mysteries remain: “We don’t yet know what neutral particles are involved in these observations. We hope our findings push the boundaries for future research.”
This project received backing from several organizations, including the National Science Foundation and the Japan Society for the Promotion of Science. As researchers delve deeper, they may unlock more of the universe’s mysteries, offering insights that could shape future technologies.
Source link
Physics; Consumer Electronics; Thermodynamics; Optics; Telecommunications; Energy and Resources; Electronics; Chemistry
