Author/Authors :
Garc??a-Mart??n، نويسنده , , A. and L?pez-Ciudad، نويسنده , , T. and Torres، نويسنده , , J.A. and Caama?o، نويسنده , , A.J. and Pascual، نويسنده , , J.I. and S?enz، نويسنده , , J.J.، نويسنده ,
Abstract :
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.
