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Topological quantization in units of the fine structure constant · Around

2010

Topological quantization in units of the fine structure constant

Maciejko, Joseph, Qi, Xiao-Liang, Drew, H. Dennis et al.

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Fundamental topological phenomena in condensed matter physics are associated with a quantized electromagnetic response in units of fundamental constants.

Recently, it has been predicted theoretically that the time-reversal invariant topological insulator in three dimensions exhibits a topological magnetoelectric effect quantized in units of the fine structure constant $\alpha=e^2/\hbar c$.
In this work, we propose an optical experiment to directly measure this topological quantization phenomenon, independent of material details.
Our proposal also provides a way to measure the half-quantized Hall conductances on the two surfaces of the topological insulator independently of each other.

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