García-Martín, A.López-Ciudad, T.Torres, J.A.Caamaño, Antonio J.Pascual, J.ISáenz, Juan J.2009-01-302009-01-301998Ultramicroscopy 73 (1998) 199-203http://hdl.handle.net/10115/1870We 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.enAtribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/Físicainfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess3325 Tecnología de las Telecomunicaciones22 Física