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Columbia researchers have provided likely first experimental evidence for a fractional topological insulator, confirming a theoretical quantum phase predicted 15 years ago within moiré superlattices. This discovery is significant because the material's robust edge currents and time-reversal symmetry could enable more stable qubits resistant to external disturbances in future quantum computing architectures.

Sources coveringQuantum Zeitgeist, Quantum Computing Report

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Columbia Researchers Find Candidate Fractional Topological Insulator

Quantum ZeitgeistJuly 19, 20264 min read

Columbia researchers have discovered a candidate for a fractional topological insulator, expanding the quantum zoo with new quantum states in two-dimensional materials. Led by Xiaoyang Zhu, the research suggests this is likely the first experimental evidence for the quantum phase, a theoretical prediction for the past 15 years.

Columbia researchers have potentially confirmed the existence of a fractional topological insulator, a quantum state predicted theoretically fifteen years ago. The team, led by Xiaoyang Zhu, Howard Family Professor of Nanoscience at Columbia, discovered the candidate material within a specially constructed moiré superlattice, achieving this formation by doping with four-thirds holes per moiré unit cell. This doping process appears to create two copies of…

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