Examinando por Autor "Torres, J.A."

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    Differential conductance in atomic-scale metallic contacts
    (Elsevier, 1998) García-Martín, A.; López-Ciudad, T.; Torres, J.A.; Caamaño, Antonio J.; Pascual, J.I; Sáenz, Juan J.
    We present exact free-electron calculations of the differential conductance of narrow necks connecting two three-dimensional electron gases. As the voltage increases, the initial quantized values of the conductance evolve into higher or lower noninteger multiples of 2e2/h. The contribution of electron tunneling through a region around the constriction is analyzed in terms of a simple model. We show that tunneling can change significatively the shape of the conductance-voltage characteristics.