Podcast Episode
Scientists Discover New Quantum State That Bridges Two Fields of Physics
January 19, 2026
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An international team of physicists has discovered a new quantum state of matter that bridges two previously separate areas of physics, a finding that could reshape the development of quantum technologies for computing, sensing, and electronics. The research, published January 14 in Nature Physics, was co-led by Qimiao Si of Rice University and Silke Bühler-Paschen of Vienna University of Technology.
The team found that strong electron interactions can generate topological behavior in a material even when the traditional particle picture of electrons completely breaks down, overturning long-held assumptions in condensed matter physics. This discovery establishes a new connection between quantum criticality and electronic topology, two phenomena that were previously thought to occur under fundamentally different conditions.
Lei Chen, co-first author and a graduate student at Rice University, explained that by merging these fields, the team ventured into uncharted territory. The researchers were surprised to find that quantum criticality itself could generate topological behavior, especially in a setting with strong interactions.
The experimental breakthrough came at Vienna University of Technology, where Diana Kirschbaum, first author of the study, observed a spontaneous Hall effect in the heavy fermion compound cerium ruthenium tin at temperatures less than one degree above absolute zero. This effect, where electrons are deflected without any external magnetic field, is a hallmark of topological states.
Kirschbaum noted that the topological effect is strongest precisely where the material exhibits the largest fluctuations. When these fluctuations are suppressed by pressure or magnetic fields, the topological properties disappear, demonstrating the intimate connection between quantum criticality and topology in this new state of matter.
Bühler-Paschen described the finding as a huge surprise, noting that it shows topological states should be defined in generalized terms. The experiments suggest that topological properties can even arise because particle-like states are absent, fundamentally challenging conventional understanding.
The finding offers a new strategy for identifying topological materials by searching among quantum-critical systems, which occur across many material classes. This connection could enable the discovery of numerous new emergent topological materials, significantly expanding the toolkit available to materials scientists.
Si emphasized that the findings address a gap in condensed matter physics by demonstrating that strong electron interactions can give rise to topological states rather than destroy them. It is not just a theoretical insight but a step toward developing real technologies that harness the deepest principles of quantum physics.
The discovery opens pathways for creating materials with enhanced quantum properties that could be used in next-generation quantum computers, ultra-sensitive sensors, and novel electronic devices. Both topological protection and quantum entanglement are highly sought-after properties in quantum technology, and materials that exhibit both simultaneously could offer significant advantages.
The study received support from the Air Force Office of Scientific Research, the National Science Foundation, the Robert A. Welch Foundation, and the Vannevar Bush Faculty Fellowship. The international collaboration demonstrates the value of combining theoretical expertise with sophisticated experimental techniques to probe the fundamental nature of quantum matter.
As researchers continue to explore this newly discovered quantum state, the field of quantum materials science stands poised for further breakthroughs that could bring quantum technologies closer to practical reality.
Merging Two Quantum Worlds
Quantum criticality and electronic topology were traditionally studied as distinct phenomena. Topology describes stable geometric patterns in the wave behavior of electrons and was typically observed in materials with weak electron interactions. Quantum criticality, where electrons fluctuate between different ordered states, occurs in systems with strongly correlated electrons.Lei Chen, co-first author and a graduate student at Rice University, explained that by merging these fields, the team ventured into uncharted territory. The researchers were surprised to find that quantum criticality itself could generate topological behavior, especially in a setting with strong interactions.
The experimental breakthrough came at Vienna University of Technology, where Diana Kirschbaum, first author of the study, observed a spontaneous Hall effect in the heavy fermion compound cerium ruthenium tin at temperatures less than one degree above absolute zero. This effect, where electrons are deflected without any external magnetic field, is a hallmark of topological states.
Kirschbaum noted that the topological effect is strongest precisely where the material exhibits the largest fluctuations. When these fluctuations are suppressed by pressure or magnetic fields, the topological properties disappear, demonstrating the intimate connection between quantum criticality and topology in this new state of matter.
A New Design Principle
The discovery establishes that topological states are more general than previously believed. The team's theoretical model, developed at Rice University, shows that topological properties can emerge even when electrons lose their particle-like character, a scenario previously thought impossible.Bühler-Paschen described the finding as a huge surprise, noting that it shows topological states should be defined in generalized terms. The experiments suggest that topological properties can even arise because particle-like states are absent, fundamentally challenging conventional understanding.
The finding offers a new strategy for identifying topological materials by searching among quantum-critical systems, which occur across many material classes. This connection could enable the discovery of numerous new emergent topological materials, significantly expanding the toolkit available to materials scientists.
Implications for Technology
The relationship between quantum criticality and topology could transform quantum technology development. Topological materials resist disruption, while quantum criticality enhances entanglement, making this hybrid state potentially valuable for computing and sensing applications.Si emphasized that the findings address a gap in condensed matter physics by demonstrating that strong electron interactions can give rise to topological states rather than destroy them. It is not just a theoretical insight but a step toward developing real technologies that harness the deepest principles of quantum physics.
The discovery opens pathways for creating materials with enhanced quantum properties that could be used in next-generation quantum computers, ultra-sensitive sensors, and novel electronic devices. Both topological protection and quantum entanglement are highly sought-after properties in quantum technology, and materials that exhibit both simultaneously could offer significant advantages.
The study received support from the Air Force Office of Scientific Research, the National Science Foundation, the Robert A. Welch Foundation, and the Vannevar Bush Faculty Fellowship. The international collaboration demonstrates the value of combining theoretical expertise with sophisticated experimental techniques to probe the fundamental nature of quantum matter.
As researchers continue to explore this newly discovered quantum state, the field of quantum materials science stands poised for further breakthroughs that could bring quantum technologies closer to practical reality.
Published January 19, 2026 at 11:49am
