NANOMAGNETS

Mesoscale Quantum Dissipation with Applications to Nanotechnolgy

 Coordinatore UNIVERSITE DE PERPIGNAN 

 Organization address address: AVENUE PAUL ALDUY 52
city: PERPIGNAN
postcode: 66860

contact info
Titolo: Ms.
Nome: Nathalie
Cognome: Pellegrin-Longuemard
Email: send email
Telefono: 00 33 4 68 66 20 67
Fax: 00 33 4 68 66 22 46

 Nazionalità Coordinatore France [FR]
 Totale costo 0 €
 EC contributo 50˙400 €
 Programma FP7-PEOPLE
Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)
 Code Call FP7-PEOPLE-IRSES-2008
 Funding Scheme MC-IRSES
 Anno di inizio 2009
 Periodo (anno-mese-giorno) 2009-02-01   -   2012-01-31

 Partecipanti

# participant  country  role  EC contrib. [€] 
1    UNIVERSITE DE PERPIGNAN

 Organization address address: AVENUE PAUL ALDUY 52
city: PERPIGNAN
postcode: 66860

contact info
Titolo: Ms.
Nome: Nathalie
Cognome: Pellegrin-Longuemard
Email: send email
Telefono: 00 33 4 68 66 20 67
Fax: 00 33 4 68 66 22 46

FR (PERPIGNAN) coordinator 50˙400.00

Mappa


 Word cloud

Esplora la "nuvola delle parole (Word Cloud) per avere un'idea di massima del progetto.

mechanics    size    particles    nanoparticles    quantum    escape    dissipation    mesoscale    spins    rate    separable    macroscopic    hamiltonians    single   

 Obiettivo del progetto (Objective)

'Quantum dissipation arising from quantum fluctuations and the quantum mechanics of macroscopic variables is important because of the ever decreasing size (mesoscale) of the nanoparticles used in technology. The most striking example occurs in information storage by magnetic nanoparticles, where the governing factor for magnetisation reversal by macroscopic quantum tunnelling is spin size S. The S dependence, with associated large quantum effects, becomes evermore marked as one proceeds from single domain particles to molecular clusters to single molecule magnets to individual spins. Here in the context of a general investigation of mesoscale quantum mechanics of particles (separable and additive Hamiltonians) and spins it is proposed to generalise Wigner’s quasi phase space formulation of quantum mechanics without dissipation (originally used to calculate quantum corrections to classical statistical mechanics i.e. the quantum/classical borderline characteristic of the mesoscale), to systems with non-separable Hamiltonians (spins) including the effects of dissipation to the surrounding heat bath. The results, obtained by (a) matrix continued fraction methods of solution of the appropriate master equations (b) computer simulation and (c) quantum Kramers escape rate theory will be compared with suitable experimental observations of the escape rate and the associated susceptibilities of nanoparticles.'

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