Details
- An international team led by IBM Research, in collaboration with the University of Manchester, Oxford, ETH Zurich, EPFL, and the University of Regensburg, has created the first molecule with a half-Möbius electronic topology—a configuration that was never before synthesized, observed, or formally predicted.
- The molecule (C₁₃Cl₂) consists of 13 carbon atoms in a ring with two chlorine atoms attached. It was assembled atom-by-atom using scanning probe microscopy under ultra-high vacuum at near-absolute-zero temperatures, with atoms removed using precisely calibrated voltage pulses.
- The half-Möbius topology creates an electronic structure where electrons undergo a 90-degree twist with each circuit around the molecule, requiring four complete loops to return to the starting phase—distinct from any previously known molecular topology.
- IBM's quantum computer was essential to validating the molecule's exotic properties. Quantum simulation revealed the helical pseudo-Jahn-Teller effect mechanism stabilizing the topology and predicted helical molecular Dyson orbitals as fingerprints of the half-Möbius structure.
- The topology can be reversibly switched between clockwise-twisted, counterclockwise-twisted, and untwisted states through voltage pulses, demonstrating that electronic topology can now be deliberately engineered rather than merely discovered in nature.
Impact
This discovery validates the potential of quantum-centric supercomputing—integrating QPUs, CPUs, and GPUs—to solve problems intractable for classical computers alone. For chemistry, it opens a new route for controlling material properties through switchable topology. For quantum computing, it represents a concrete proof that quantum hardware can directly contribute to real scientific insights at the molecular scale, advancing Richard Feynman's decades-old vision of quantum simulation.
