Coherent spin relaxation in molecular magnets

Abstract

Numerical modelling of coherent spin relaxation in nanomagnets, formed by magnetic molecules of high spins, is accomplished. Such a coherent spin dynamics can be realized in the presence of a resonant electric circuit coupled to the magnet. Computer simulations for a system of a large number of interacting spins is an efficient tool for studying the microscopic properties of such systems. Coherent spin relaxation is an ultrafast process, with the relaxation time that can be an order shorter than the transverse spin dephasing time. The influence of different system parameters on the relaxation process is analysed. The role of the sample geometry on the spin relaxation is investigated.Comment: Latex file, 22 pages, 7 figure

Quantum decision theory as quantum theory of measurement

“…The probability operator for the conjunction action π n e α ∈ B is the self-adjoint operator P (π n e α ) ≡P (e α )P (π n )P (e α ), (24) defined on M and satisfying the normalization condition n,αP (π n e α ) =1, (25) in which1 is the identity operator on M and the summation is over all π n ∈ L and e α ∈ A.…”

Dynamics of quantum dot superradiance

“…Optical superradiance from Bose-Einstein condensed atoms has also been investigated [4]. There also exists spin superradiance produced by spin systems, such as nuclei [5][6][7][8] or magnetic molecules [9][10][11][12]. It has been suggested [13] that the assemblies of quantum dots or wells could also be arranged so that to produce superradiance.…”

Influence of quadratic Zeeman effect on spin waves in dipolar lattices

“…There exist many materials, whose constituents interact through magnetic dipolar forces. Such lattices can be formed by magnetic nanomolecules [3][4][5][6][7][8], magnetic nanoclusters [9][10][11], magnetic particles inserted into a nonmagnetic matrix [12,13]. Different dipolar atoms and molecules can be arranged in self-assembled lattices or can form lattice structures with the help of superimposed external fields [14][15][16][17][18].…”