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DTSTART:20160327T010000
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DTSTART:20161030T010000
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DTSTART;TZID=Europe/Rome:20160510T110000
DTEND;TZID=Europe/Rome:20160510T123000
DTSTAMP:20260512T215324
CREATED:20160509T133040Z
LAST-MODIFIED:20171026T122714Z
UID:3017-1462878000-1462883400@w3.lnf.infn.it
SUMMARY:Precise top-quark mass determination from energy peaks
DESCRIPTION:We examine the general features of the non-commutativity of the magnetization operator and Hamiltonian for small quantum spin clusters. The source of this non-commutativity can be a difference in the Landé g-factors for different spins in the cluster\, XY-anisotropy in the exchange interaction and the presence of the Dzyaloshinskii-Moriya term in the direction different from the direction of the magnetic field. As a result\, zero-temperature magnetization curves for small spin clusters mimic those for the macroscopic systems with the band(s) of magnetic excitations\, i.e. for the given eigenstate of the spin cluster the corresponding magnetic moment can be an explicit function of the external magnetic field yielding the non-constant (non-plateau) form of the magnetization curve within the given eigenstate. In addition\, the XY-anisotropy makes the saturated magnetization (the eigenstate when all spins in cluster are aligned along the magnetic field) inaccessible for finite magnetic field magnitude (asymptotical saturation). We demonstrate all these features on three examples: spin-1/2 dimer\, mixed spin-(1/2\,1) dimer\, spin-1/2 ring trimer. We consider also the simplest Ising-Heisenberg chain\, the Ising-XYZ diamond chain with four different g-factors. In the chain model the magnetization curve has a more complicated and non-trivial structure which that for clusters.
URL:/event/precise-top-quark-mass-determination-from-energy-peaks-2/
LOCATION:Aula Seminari\, Via Enrico Fermi\, 40\, Frascati\, Roma\, 00044\, Italia
CATEGORIES:Seminari teorici
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