A Building Block of Protein Helps a Quantum Material Work at Room Temperature

Many of the strangest behaviours in physics only appear when things get extremely cold. Cool a material enough, and electrons can start moving in orderly, quantum patterns instead of jostling around randomly. The trouble is that the cold needed is often far colder than anything in everyday life — which makes the behaviour fascinating, but hard to use.

A UCLA-led team has now found a surprising way to keep one such quantum behaviour going at warm temperatures: add an amino acid. Amino acids are the building blocks of proteins, the molecules of life. The research, announced on 20 October 2026 and published in Nature Chemistry, started with a material that behaves unusually when extremely cold and showed that the unusual behaviour could be extended to well above room temperature.

A pattern that needs the cold — until now

The base material was a stack of sheets, each just three atoms thin, made from a compound called tantalum disulfide. Its special behaviour is known as the commensurate charge density wave (CCDW). Normally, electrons move more or less randomly through a metal and are easily bumped off course by the small-scale vibrations caused by heat. In the CCDW, electrons move together in a pattern that traces the internal structure of the material, following the counterintuitive rules of the quantum world.

At first, that pattern only appeared at extreme cold — 135 degrees below zero Fahrenheit, close to the most frigid temperature ever recorded in Antarctica, according to UCLA. The team showed it could be extended to up to about 135 degrees Fahrenheit, close to the highest heat ever measured in Death Valley, California — well above room temperature.

Getting there took one surprising step: adding arginine, an amino acid. The combined material was made of repeated vertical stacks, with two layers of arginine sandwiched between single layers of tantalum disulfide. When two other amino acids were combined with tantalum disulfide, neither showed CCDW behaviour at room temperature. The researchers found that the arginine molecule fits into the tantalum disulfide's crystal matrix like a puzzle piece. The perfect fit — the amino acid's size and how its electrons are distributed — seems to explain its dramatic effect.

The discovery began as a happy accident. In an earlier study, the researchers had put tantalum disulfide and arginine together while screening more than 50 different carbon-based molecules to see which ones combine with advanced materials. Extending the temperature range for the CCDW was revealed in later analysis. Computer simulations then helped establish why arginine changed the quantum material's behaviour, alongside measurements of vibrations, electrical flow, temperature changes and atomic structure.

Why it matters

The study's corresponding author is Xiangfeng Duan, distinguished professor of chemistry and biochemistry at UCLA, with co-first authors Jingyuan Zhou and Boxuan Zhou, UCLA postdoctoral researchers, and theoretical contributions led by Zhenglu Li at the University of Southern California. The work was an international collaboration, with co-authors also at Tamkang University in Taiwan, UC Irvine and the University of Chemistry and Technology, Prague.

The investigators describe the use of an amino acid as a rare example of inorganic materials chemists using molecular chemistry to modulate the electronic behaviour of inorganic crystals. The findings may open up the design space for advanced materials to include other molecules of life.

With further development, the tantalum disulfide–arginine combination could provide the basis for new technologies such as energy-efficient computer memory — an entirely new type of storage based in quantum properties, instead of the electrons that are the basis for traditional electronics. That is a possibility for the future, not a working device yet. The researchers' next steps will seek to advance understanding of both the material and the method, and the specifications that made arginine such a perfect match could one day inform rational design: starting with a desired property, such as superconductivity, and then identifying or designing molecules to achieve it.

For physics students, the lesson is about fit and scale. A tiny change in what sits between atomic sheets — one molecule that fits just right — can decide whether a quantum pattern survives the shaking of heat or falls apart. Small causes, in the quantum world, can have very large effects.

If physics sometimes feels abstract, a first lesson in physics can make ideas like quantum behaviour, electrons and temperature concrete — starting from what can be seen and measured, and building up to the questions scientists are still trying to answer, with booster and mock-exam help in physics along the way. Book your first lesson

Sources:

California NanoSystems Institute at UCLA / UCLA Newsroom, "UCLA-led study finds amino acid extends quantum properties above room temperature", 20 October 2026: https://cnsi.ucla.edu/october-20-2026-ucla-led-study-finds-amino-acid-extends-quantum-properties-above-room-temperature/