Quantum Hall Insulator Maintains Robust Transport at 600mV Bias

Researchers have demonstrated dissipationless quantum adiabatic transport in a quantum anomalous Hall insulator while applying a bias voltage of at least 600 mV at 4.2 K. This level of robustness, exceeding any known energy scale associated with the quantum anomalous Hall state, overcomes a critical limitation that previously caused breakdown in these materials. The team utilized electrochemical potential balancing to mitigate electric field effects, enabling stable and highly sensitive measurements at temperatures significantly above 1 K previously achievable. This advancement brings the potential for a new type of quantum resistance standard and improved quantum metrology closer to practical application. A quantum material has demonstrated remarkably robust…