Nanotube-based switching elements with multiple controls and circuits made
from such. A switching element includes an input node, an output node,
and a nanotube channel element having at least one electrically
conductive nanotube. A control structure is disposed in relation to the
nanotube channel element to controllably form and unform an electrically
conductive channel between said input node and said output node. The
output node is constructed and arranged so that channel formation is
substantially unaffected by the electrical state of the output node. The
control structure includes a control electrode and a release electrode,
disposed on opposite sides of the nanotube channel element. The control
and release may be used to form a differential input, or if the device is
constructed appropriately to operate the circuit in a non-volatile
manner. The switching elements may be arranged into logic circuits and
latches having differential inputs and/or non-volatile behavior depending
on the construction.