The Wigner function formalism is used for studying electron quantum transport in mesoscopic systems. In this work we show that, if the correlation of the electron wave function vanishes outside the region of interest (for example inside the contacts), then transport is affected inside the device. This property is verified analytically. Results show that, for very short devices, tunneling is actually influenced by the distance between the contacts. Modification in the electron density and conductivity have been numerically observed.
PROXIMITY EFFECT OF THE CONTACTS ON ELECTRON TRANSPORT IN MESOSCOPIC DEVICES / A., Bertoni; Bordone, Paolo; G., Ferrari; N., Giacobbi; Jacoboni, Carlo. - In: JOURNAL OF COMPUTATIONAL ELECTRONICS. - ISSN 1569-8025. - STAMPA. - 2:(2003), pp. 137-140. [10.1023/B:JCEL.0000011414.18872.fa]