Field Effects in Extremely Thin Crystals of Bi8Te7S5

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Abstract
Field effect conductivity measurements have been performed on extremely thin crystals of Bi8Te7S5. Only the thinnest (5 atoms thick) crystals show an unusual behavior, which can be readily explained in terms of the Fermi sphere, which does not intersect quantized Fermi momentum levels at zero bias. It is shown that both the volume density of carriers and the spacing of quantized kF levels increase at the same rate with decreasing sample thickness; thus the limitation in the observability of quantized kF levels is in the areal carrier density σ that the dielectric material between the film and the gate will allow.

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