# What is the exact point of Anderson's localization paper?

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Today, the idea of Anderson localization (as far as i understand) is that, in a disordered system, there are some localized single-particle eigenstates. Especially, in 1d and 2d, there are exclusively only such states.

But, isn't it obvious that a defect potential in some periodic potential can induce defect modes? Actually, if you lower the potential of some site in a periodic tight-binding model, you create a defect mode, which can be solved analytically easily.

So, what was the exact idea of Anderson?

This post imported from StackExchange Physics at 2015-12-27 11:23 (UTC), posted by SE-user John
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