High-Frequency Properties of Mesoscopic Junctions
The statistics of electron levels in an open disordered quantum system is one of the general problems solved in the theory of mesoscopics. As the random potential of elastic scatterers in disordered conductors leads to repulsion of electron levels, the latter are strongly correlated near the Fermi energy. In an open system, such as a mesoscopic junction of the characteristic size L joining bulky electrodes, this correlation exists only within intervals of the width ∆ϵ ≈ h/ τf , where τf ≈ L 2 /D is the time of diffusion through the junction. The electron spectrum can be conveniently divided into un correlated intervals with almost independent fluctuations of the number of transport levels. The temperature dependence of the mesoscopic resistance , and the non-linear conductance fluctuations of small metallic particles  were shown to be sensitive to this correlation. Here it is argued that the structure of the electron spectrum predicted by Alt-shuler and Shklovskii  manifests itself in random frequency dependences of AC-kinetic coefficients of microjunctions. Thus, all of them can serve as spectral “fingerprints” of a sample in the same way as the magnetoresistance serves as its “magneto-fingerprint” .
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