= M. Kohmoto
{c}
A theoretical researcher whose joint work connected the <quantum Hall effect> with a <topological invariant>. For electrons in a two-dimensional periodic potential and <magnetic field>, the Hall response can be expressed using the structure of occupied quantum states. Its integer character explains how a transport coefficient can remain quantized despite changes in microscopic details.<Quantized Hall Conductance in a Two-Dimensional Periodic Potential by D. J. Thouless and others>[pp. 405–407: Hall-conductance formula and integer invariant]{ref}
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