Model non-linear nano-electronic device

CHRISTIAN F. A. NEGRE; PABLO A. GALLAY; CRISTIÁN G. SÁNCHEZ

CHEMICAL PHYSICS LETTERS

Elsevier

Año: 2008 vol. 460 p. 220 - 224

0009-2614

We show a simple model for a non-linear nano-electronic device displaying a range of current-voltage characteristics including negative differential resistance, multistability and rectification. The tight-binding model for the device consists of a pair of coupled quantum dots attached to two semi-infinite linear monoatomic chains. Non linearity is introduced via electron-electron coulomb repulsion through an onsite Hubbard U. We study the mean-field electronic structure of the device as a function of applied potential difference for a range of values of the intra-device coupling and coupling to the leads.