Spin Lattices

What is the project?

One of the most interesting concepts in condensed matter is the so-called “frustration”, where a few spins in the system cannot find an orientation to fully satisfy all the interactions with its neighbouring spins. Frustration is a complex and not well-understood phenomenon with interdisciplinary applications to artificial neural networks as well as material science. The classic example is 3 spins a triangular geometry with antiferromagnetic coupling between the nearest neighbours. We have recently introduced exciton-polariton (polariton) condensates as a new platform to study such spin interactions [1-3]. Polariton condensates are macroscopic quantum states with picosecond dynamics and unique spin properties arising from their nonlinearities.

What is my involvement?

You will experimentally study the spin properties of coupled polariton condensates in 2-dimensional optical lattices in various geometries, specifically the phenomenon of frustration. Your project will also involve a fair amount of programming, and numerical simulations in a collaboration with our theorists.

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

Synchronization Crossover of Polariton Condensates in Weakly Disordered Lattices. Physical Review B (2018)

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Spin Order and Phase Transitions in Chains of Polariton Condensates. Physical Review Letters (2017)

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Tunable Magnetic Alignment between Trapped Exciton-Polariton Condensates. Physical Review Letters (2016)

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

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