Polaritonic Devices

What is the project?

Our aim is to build ultra-highspeed (50 GHz) room-temperature opto-electronic chips based on our recent demonstration of spontaneously magnetised polariton condensates [1,2]. Exciton-polaritons (polaritons) are superpositions of photons in a Fabry-Pérot microcavity and confined excitons in 2-dimensional quantum wells. They are very light (100,000 times lighter than electrons) and very fast (>100 GHz) thanks to their photonic component, but they can also strongly interact with each other due to their excitonic part. Polaritons can form macroscopic quantum states like atomic Bose-Einstein condensates, and using organic materials they can condense at room temperature. In certain conditions, polariton condensates can spontaneously acquire macroscopic spins of up or down. In this project we aim to exploit them to make ultra-highspeed optoelectronic switches and true random number generators on a chip that can be integrated into the next generation of CPUs and telecommunications.

What is my involvement?

You will fabricate electrically contacted organic-based microcavities in close collaboration with Prof. Turnbull and Prof. Samuel’s group, and study the condensation and specifically their spin properties. You are also expected to travel to the sunny island of Crete in Greece for some parts of the fabrication process.

Yes, we have an ongoing industrial partner at Hitachi, Cambridge.

Is this PhD project funded?

Yes, this is a fully funded CM-CDT studentship, which covers your tuition fees and subsistence.

How can I apply?

Send your CV and cover letter to Dr Ohadi.

Publications

A sub-femtojoule electrical spin-switch based on optically trapped polariton condensates. Nature Materials (2016)

PDF Project DOI

Spontaneous Spin Bifurcations and Ferromagnetic Phase Transitions in a Spinor Exciton-Polariton Condensate. Physical Review X (2015)

PDF Project Project DOI