Designing a symmetry protected molecular device
22.07.2011 at 10:15
ambitious challenges in nanotechnology.
Even though remarkable progress has been made, being able to gate and control nanometer
scale objects, as well to interconnect them to achieve scalability remains extremely difficult.
Most experiments concern a single quantum dot or molecule, and they are made at ultra low
temperature to avoid decoherence and tunnelling. We propose to use canonical transformations
to design quantum devices that are protected by symmetry, and therefore, may be operational at
high temperatures. We illustrate the idea with an example of a quantum transistor controlled by
a gate electrode in a three terminal setup. We consider the effects of interactions, and we find
that the same principles can be applied to design a device that could operate as an electrically
controlled spin qubit.