Séminaire du LPTMS: Mario Collura *** séminaire exceptionnel ***


11:00 - 11:30

LPTMS, salle 201, 2ème étage, Bât 100, Campus d'Orsay
15 Rue Georges Clemenceau, Orsay, 91405
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Full counting statistics out of equilibrium: melting of antiferromagnetic order

Mario Collura (Oxford University, UK)

One of the basic principles of quantum mechanics is the statistical nature of measurements of observables. The result of measurements is indeed described by a probability distribution, and measuring the same observable  in identical systems will give different outcomes in accordance with this distribution.  The full probability distribution carries very detailed information about the system and, on top of expectation value, encodes all fluctuations of the system.  I will focus on the non-equilibrium dynamics of a fully polarised antiferromagnetic state under the unitary evolution induced by the XXZ Hamiltonian. It turns out that, depending on the value of the interactions, the full probability distribution of the subsystem staggered magnetisation may retain informations about the original antiferromagnetic order, thus acquiring a shape much different from a simple Gaussian distribution.

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