Behaviour of the localization length

We now give evidence to show that, when EF lies AE above Ec and AE is small we can define a length , called the coherence length, which is the localization length for an energy AE below Ec. We show again that at T=0, i.e. when Ls is infinite, 

All of these results neglect electron-electron interaction, which may profoundly affect them, though we do not believe that it affects (60). 

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