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A theoretical researcher whose joint analysis of electrons in a periodic potential helped give the <quantum Hall effect> a topological description. Integrating information about the quantum states across their momentum domain yields an integer contribution to <Hall conductivity>. The calculation relates the geometry of wavefunctions to a macroscopic electrical response.<Quantized Hall Conductance in a Two-Dimensional Periodic Potential by D. J. Thouless and others>[pp. 405–407: integer expression for Hall conductance]{ref}
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