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Low-frequency noise properties of beryllium δ-doped GaAs/AlAs quantum wells near the Mott transition

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Figure

FIG. 1. (a) Experimental apparatus: S—investigated sample, RADC—analogue-to-digital converter (National InstrumentL—load resis-tor, Rref—reference resistor, LNA—low-noise amplifier, F—filter system,TM PCI 6115board), PC—personal computer, Osc.—oscilloscope;
FIG. 3. Resistance of the investigated samples as a function of temperature.
FIG. 4. The dependencies of normalizedspectral densities of voltage noiseon temperature at different frequencies(the sample numbers are given in thediagrams)
FIG. 6. The low–frequency noise spectraof samples No. 3 and No. 4 at differenttemperatures with expanded view givenin (b) and (d) plots.
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