Quantum Hall Insulator Achieves Robust Transport at High Bias
Researchers have achieved dissipationless quantum adiabatic transport in a quantum anomalous Hall insulator under a bias voltage of at least 600 mV at 4.2 K. This breakthrough overcomes a critical limitation that previously caused breakdown in these materials. The team used electrochemical potential balancing to mitigate electric field effects, enabling stable measurements at higher temperatures. The study, published in Nature Communications, focused on Cr/V-doped (Bi,Sb)2Te3, a material exhibiting the quantum anomalous Hall effect without an external magnetic field. The researchers employed a multi-terminal Corbino device design to eliminate electric fields between edge modes, allowing for sustained quantum adiabatic transport. 
