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Séminaire MCBT

Mardi 10 février 2015 à 11h00,
Salle Louis Weil, E424

Long distance spin-spin entanglement and coexistence of multiple entanglements
Orateur : Emilio Lorenzo (MagSup)

Abstract

Entanglement is a concept that has defied common sense since the discovery of quantum mechanics. Two particles are said to be entangled when the quantum state of each particle cannot be described independently, no matter how far apart in space and time these two particles are. We demonstrate experimentally that unpaired spins separated by several hundred Å entangle through a collection of spin singlets made up of antiferromagnetic spin-1/2 chains in a bulk material. Low-temperature magnetization and specific heat studies as a function of magnetic field reveal the occurrence of very dilute spin dimers and at least two quantum phase transitions related to the breaking of excited local triplets. The mechanism at the origin of the unpaired spins inside the quantum chains is the inter-modulation potential between two sublattices, and may be replicated using well-designed synthetic multilayers. Finally I will show that many different kind of entangled species (more than 6 here !!!) can coexist in the same compound without interfering.

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