Abstract
In one electron picture, the electronic states in a crystalline solid are extended Bloch states. This is a direct consequence of the Bloch-Floquet’s theorem. These quantum states are labelled by the wave-vector, к, and the band index, n. For Bloch states these are good quantum numbers. In a disordered solid, on the other hand, with the breakdown of long-ranged order, the wave-vector, к, is no longer a good quantum number. Of course, the states may still be extended, but cannot be characterized by к. The seminal paper by Anderson [1] stated that if the disorder is strong enough, all the electronic states become localized and at T = 0°o leads to a metal-insulator transition.He considered a tight-binding Hamiltonian with only on-site disorder characterized by a probability density of width W and a crystalline band-width of, B. Anderson showed that when the dimensionless parameter W/B is greater than a critical value (W/B) c all states in the band of the electron in the disordered lattice are localized.
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Mookerjee, A., Saha-Dasgupta, T., Dasgupta, I. (2009). Quantum Transmittance Through Random Media. In: Chakrabarti, B., Bardhan, K., Sen, A. (eds) Quantum and Semi-classical Percolation and Breakdown in Disordered Solids. Lecture Notes in Physics, vol 762. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-85428-9_3
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