Single-electron transistor

A single-electron transistor (SET) is a sensitive electronic device based on the Coulomb blockade effect. In this device the electrons flow through a tunnel junction between source/drain to a quantum dot (conductive island). Moreover, the electrical potential of the island can be tuned by a third electrode, known as the gate, which is capacitively coupled to the island. The conductive island is sandwiched between two tunnel junctions modeled by capacitors, ${\displaystyle C_{\rm {D}}}$ and ${\displaystyle C_{\rm {S}}}$, and resistors, ${\displaystyle R_{\rm {D}}}$ and ${\displaystyle R_{\rm {S}}}$, in parallel.