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• W2030969366 abstract "The asymptotic staying probability $P$ in the Landau-Zener effect with interaction is analytically investigated at fast sweep $ensuremath{epsilon}=ensuremath{pi}{ensuremath{Delta}}^{2}∕(2ensuremath{hbar}v)⪡1$. We have rigorously calculated the value of ${I}_{0}$ in the expansion $Pensuremath{cong}1ensuremath{-}ensuremath{epsilon}+{ensuremath{epsilon}}^{2}∕2+{ensuremath{epsilon}}^{2}{I}_{0}$ for arbitrary couplings and relative resonance shifts of individual tunneling particles. The results essentially differ from those of the mean-field approximation. It is shown that strong long-range interactions such as dipole-dipole interaction generate huge values of ${I}_{0}$ because a flip of one particle strongly influences many others. However, in the presence of strong static disorder, making the resonances for individual particles shifted with respect to each other, the influence of interactions is strongly reduced. In molecular magnets the main source of static disorder is the coupling to nuclear spins. Our calculations using the actual shape of the ${mathrm{Fe}}_{8}$ crystal studied in the Landau-Zener experiments [Wernsdorfer et al., Europhys. Lett. 50, 552 (2000)] yield a value of ${I}_{0}$ that is in good agreement with the value extracted from the experimental data." @default.
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• W2030969366 date "2005-05-26" @default.
• W2030969366 modified "2023-09-30" @default.
• W2030969366 title "Many-body Landau-Zener effect at fast sweep" @default.
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• W2030969366 doi "https://doi.org/10.1103/physrevb.71.184414" @default.
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