= Quantum Hall edge state
A <quantum Hall edge state> is confined across a boundary but can extend along it and carry <electric current>. <B. I. Halperin> related these current-carrying boundary states to quantized Hall transport in a disordered two-dimensional system.<Quantized Hall conductance, current-carrying edge states, and the existence of extended states in a two-dimensional disordered potential by B. I. Halperin>[Publisher abstract: transverse confinement, perimeter extension and current]{ref}
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