Novel compound-semiconductor logic for computing applications

The PhD project will further develop a patent-pending alternative approach to digital logic that abandons the CMOS paradigm underpinning computing.

Practical implementation of digital logic requires pairs of devices that display complementary, or opposite, behaviour, i.e., the same input will turn one device on and its complementary partner off. This is currently achieved by pairs of nMOS and pMOS (MOS = metal oxide semiconductor) field-effect transistors, hence CMOS, where C stands for complementary. In our concept, logical complementarity, and hence function, is achieved by a single device where an electron reservoir is sandwiched between two normally-off channels. Application of a positive gate voltage to the top of the device will pull the electrons to the top channel, turning it on, whilst the bottom channel remains off. Similarly, application of a negative gate voltage to the top of the device will push the electrons to the bottom channel, turning it on, whilst the top channel remains off. This device has a number of intrinsic advantages over CMOS, it is twice as compact, highly symmetric and expected to have lower dissipation.

The feasibility of the concept has been demonstrated via simulations and prototype devices in an existing PhD project. The scope of the new work involves next steps such as fabrication and testing of more complex logic gates and circuits, scaling of devices, low-temperature testing and integration with ULTRARAM™.

This PhD is offered in collaboration with Quinas Technology.

The Lancaster Physics Department holds an Athena SWAN silver award and Institute of Physics JUNO Championship status and is strongly committed to fostering inclusion and diversity within its community.

Applicants are expected to have the equivalent of a first (1) or upper second (2.1) degree class in Physics or Astrophysics, supplemented by a relevant Master's-level qualification. Potential applicants are invited to apply to the physics department through this link: https://www.lancaster.ac.uk/physics/study/phd/ stating the title of the project and the name of the supervisor.