Experimental implications of the Entanglement Transition in clustered quantum magnets.

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• Hannah Irons (University of Kent)
• Monday 07 September 2015, 14:00-15:00
• Physics East 217.

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A factorised state in 1D Antiferromagnetic chains has been known for a long time and recently this semi classical state has been linked to the signature of an Entanglement Transition. When quantifying entanglement it is common to use local measurements such as Quantum Discord but in order for features of the system to be picked up using neutron scattering methods our theoretical quantities need to be relatable to global measurements. Measures of Entanglement stem from the correlation functions and by focusing on these we observe a flattening of the correlators at the factorisation field that would give classical Long Range Order. The factorisation field is dependent on the anisotropy of the chain and it can be shown entirely separately from the critical field. Our research has been to identify the Entanglement Transition in a system that can be realised experimentally in an environment above zero temperature. We study in great detail finite sized systems using exact methods to model the scattering function for some quantum molecular magnets. We observe a remarkable change in the neutron scattering cross section as the applied field passes through the Entanglement Transition which is also robust to low finite temperature calculations.

This talk is part of the Cold Atoms series.

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