Quantum spin liquids have fascinated physicists for years because they could eventually support transformative technologies, including quantum computing and dissipationless energy transmission. Unlike ordinary magnets that settle into an orderly pattern, these materials avoid conventional magnetic order. Instead, their magnetic moments remain strongly quantum-entangled and in constant collective motion at temperatures close to absolute zero, producing behavior that resembles emergent quantum electrodynamics.

“We’ve answered a major open question by directly detecting these excitations,” said Dai, the Sam and Helen Worden Professor of Physics and Astronomy. “This confirms that Ce2Zr2O₇ behaves as a true quantum spin ice, a special class of quantum spin liquids in three dimensions.”

Cleaner Measurements With Polarized Neutron Scattering

To pin down these elusive signatures, the researchers relied on advanced polarized neutron scattering. This approach helped them isolate the magnetic scattering they cared about while filtering out other signals, even as the system approached the zero temperature limit.

Their measurements also revealed emergent photon signals near zero energy — a defining trait that separates quantum spin ice from more familiar phases found in conventional magnets. Additional evidence came from specific heat measurements, which supported the idea that these predicted emergent photons follow a dispersion resembling the way sound moves through a solid.

Earlier attempts to confirm this kind of behavior were often undermined by technical noise and incomplete data. The Rice-led team addressed those challenges through improved sample preparation and high-precision instruments, supported by an international effort involving major laboratories across Europe and North America.

First-of-Its-Kind Observation With Big Implications

In this three-dimensional candidate material, the researchers observed both emergent photons and spinons — key hallmarks of quantum spin ice. The result resolves a long-running debate in condensed matter physics and gives scientists a strong platform for studying next-generation quantum phenomena and potential technology pathways.

Bin Gao, a research scientist in Rice’s Department of Physics and Astronomy and the study’s first author, said the findings back up decades of theoretical expectations.

“This surprising result encourages scientists to look deeper into such unique materials, potentially changing how we understand magnets and the behavior of materials in the extreme quantum regime,” Gao said.

Research Team and Funding

Co-authors of this study include Félix Desrochers and Yong Baek Kim of the University of Toronto; Rice alumnus David Tam of the Paul Scherrer Institut; Silke Paschen, Diana Kirschbaum and Duy Ha Nguyen of Vienna University of Technology; Paul Steffens and Arno Hiess of the Institut Laue-Langevin; Yixi Su of Jülich Centre of Heinz Maier-Leibnitz Zentrum; and Sang-Wook Cheong of Rutgers University.

The U.S. Department of Energy, the Gordon and Betty Moore Foundation and the Robert A. Welch Foundation supported this study.

The case involved a 47 year old man from New Jersey who was previously healthy and died suddenly about four hours after eating beef. For months, the cause of his death remained unclear. That changed when Thomas Platts Mills, MD, PhD, a UVA Health physician and internationally recognized allergy specialist, took a closer look. Platts Mills originally identified the condition years ago and continues to lead research into how it affects patients.

How Lone Star Tick Bites Trigger Alpha Gal Allergy

The allergy develops after a bite from the Lone Star tick. These bites can cause the immune system to become sensitive to alpha gal, a sugar naturally found in meat from mammals. Once sensitized, people may experience allergic symptoms after eating foods such as beef, pork, or lamb. Common reactions include skin rashes, nausea, and vomiting.

Scientists have long suspected that severe cases could escalate into life threatening anaphylaxis. Until now, however, no fatal cases had been officially confirmed.

“The important information for the public is: First, that severe abdominal pain occurring 3 to 5 hours after eating beef, pork or lamb should be investigated as a possible episode of anaphylaxis; and, second, that tick bites that itch for more than a week or larvae of ticks often called ‘chiggers’ can induce or increase sensitization to mammalian-derived meat,” said Platts Mills, former chief of UVA Health’s Division of Asthma, Allergy and Clinical Immunology. “On the other hand, most individuals who have mild to moderate episodes of hives can control symptoms with an appropriate diet.”

What Happened Before the Man’s Death

The man, whose name was not made public, had gone camping with his wife and children during the summer of 2024. One evening, the family ate a late steak dinner at 10 p.m. Around 2 a.m., the man woke up with intense stomach pain, diarrhea, and vomiting. Although he felt better by morning, he later told his son that the episode had felt life threatening.

About two weeks later, still unaware that he had developed the meat allergy, he attended a barbeque and ate a hamburger. He began feeling unwell shortly after 7 p.m. At 7:37 p.m., his son found him collapsed in the bathroom.

Autopsy Raises More Questions Than Answers

An autopsy did not reveal a clear explanation for his death. The official cause was listed as “sudden unexplained death.”

His wife was not satisfied with that conclusion and asked another physician to review the findings. That doctor contacted Platts Mills and his team to explore whether alpha gal sensitivity could be involved.

Blood Tests Reveal Severe Allergic Reaction

Platts Mills obtained blood samples that had been collected after the man’s death. Testing showed that he had indeed been sensitized to alpha gal. The results also pointed to an extreme immune response consistent with fatal anaphylaxis.

When asked about recent tick exposure, the man’s wife said he had not noticed any tick bites in the past year. However, she recalled that he had suffered 12 or 13 itchy bites around his ankles earlier in the summer, which they believed were caused by chiggers. Platts Mills recognized that many bites thought to be from chiggers in the eastern United States are actually from Lone Star tick larvae.

Factors That May Have Worsened the Reaction

Platts Mills and his colleagues believe several conditions may have intensified the man’s allergic response. These include drinking a beer with the hamburger, exposure to ragweed pollen, and physical exercise earlier that day. Family members also noted that he rarely ate red meat, which may have influenced how his immune system reacted.

Growing Tick Populations Increase Risk

Following the case, Platts Mills is urging doctors to stay alert for patients who may have developed this allergy or who face higher exposure risk. He pointed out that deer populations are rapidly increasing in many states, creating ideal conditions for the Lone Star tick to spread.

“It is important that both doctors and patients who live in an area of the country where Lone Star ticks are common should be aware of the risk of sensitization,” Platts Mills said. “More specifically, if they have unexpected episodes of severe abdominal pain occurring several hours after eating mammalian meat, they should be investigated for possible sensitization to the oligosaccharide alpha-gal.”

Case Findings Published in Medical Journal

Details of the case have been published in the Journal of Allergy and Clinical Immunology: In Practice. The article is open access, meaning it is available to read for free. The authors include Platts Mills, Lisa J. Workman, Nathan E. Richards, Jeffrey M. Wilson, and Erin M. McFeely.

The research team obtained consent from the man’s widow before releasing the findings.