What new state of matter, a 'Dirac fluid,' where electrons flow like a nearly frictionless liquid, was identified in graphene in April 2026?

Scientists recently observed a remarkable new state of matter in graphene, where electrons flow not as individual particles, but as a collective, nearly frictionless liquid. This exotic phenomenon, identified in April 2026 by researchers at the Indian Institute of Science (IISc) and the National Institute for Materials Science in Japan, has been dubbed a "Dirac fluid." This discovery marks a significant breakthrough in condensed matter physics, offering new insights into the fundamental behavior of electrons in materials.

The identification of a Dirac fluid in graphene is particularly noteworthy because it challenges long-held principles of electron behavior. Typically, in metals, electron flow is governed by the Wiedemann-Franz law, which dictates a proportional relationship between electrical and thermal conductivity. However, in this newly observed state, electrons in ultraclean graphene samples exhibited a dramatic deviation from this law, with electrical and thermal conductivities moving in opposite directions. This fluid-like motion, characterized by extremely low viscosity, occurs at a unique electronic state in graphene known as the "Dirac point," where the material acts as neither a metal nor an insulator.

The collective, frictionless flow of electrons in a Dirac fluid mimics the behavior of quark-gluon plasma, an exotic "soup" of subatomic particles found in high-energy physics experiments. This breakthrough transforms graphene into a powerful platform for exploring quantum phenomena previously confined to extreme environments, including those related to black hole thermodynamics. Beyond its fundamental scientific implications, the discovery of Dirac fluid could pave the way for advanced quantum technologies, such as highly sensitive quantum sensors capable of detecting incredibly faint electrical signals and magnetic fields.