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87:, as a measure of the sensitivity of energy levels to a change in the boundary conditions of the system. Though being a classical quantity, it has been shown to play an important role in the quantum-mechanical treatment of disordered systems.
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the size of the system, and thereby inversely proportional to the diffusion time
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140:{\displaystyle E_{\rm {T}}={\frac {\hbar D}{L^{2}}}}
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202:{\displaystyle t_{D}={\frac {L^{2}}{D}}}
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