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NUMERICAL INVESTIGATION OF AN EXTERNALLY DRIVEN SPIN DYNAMICS IN SEARCH OF A CLASSICAL CONDENSATION OF WAVES

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dc.contributor.author Yegovtsev, Nikolay
dc.date.accessioned 2017-06-21T08:48:26Z
dc.date.available 2017-06-21T08:48:26Z
dc.date.issued 2017
dc.identifier.citation Yegovtsev, Nikolay (2017) NUMERICAL INVESTIGATION OF AN EXTERNALLY DRIVEN SPIN DYNAMICS IN SEARCH OF A CLASSICAL CONDENSATION OF WAVES. Nazarbayev University, School of Science and Technology ru_RU
dc.identifier.uri http://nur.nu.edu.kz/handle/123456789/2398
dc.description.abstract The following work is a numerical study of a recently discovered Bose-Einstein condensation of magnons at room temperature by purely classical means. The classical Hamiltonian of the system includes exchange and dipolar interaction as well as interaction with external magnetic field. The system under consideration is a 2-dimentional lattice of classical spins with fixed positions. Classical equations of motions are derived from this Hamiltonian by applying the Poisson-bracket formalism. Equations of motions were solved numerically by the 4th order Runge-Kutta algorithm and obtained spin dynamics is transformed to the frequency space by the means of Fourier transform. This spectral decomposition of the dynamics allows monitoring the occupation of the energy states and observing condensation into the lowest energy state. In this work, we were able to reproduce the dispersion curve with characteristic minimum at non-zero value of the wave-vector by varying parameters of the system. We discuss models for pumping and dissipation, and hope to implement them in the future work. ru_RU
dc.language.iso en ru_RU
dc.publisher Nazarbayev University School of Science and Technology ru_RU
dc.rights Attribution-NonCommercial-ShareAlike 3.0 United States *
dc.rights.uri http://creativecommons.org/licenses/by-nc-sa/3.0/us/ *
dc.subject numerical study ru_RU
dc.subject Hamiltonian ru_RU
dc.subject classical equations ru_RU
dc.subject Research Subject Categories::NATURAL SCIENCES::Physics ru_RU
dc.title NUMERICAL INVESTIGATION OF AN EXTERNALLY DRIVEN SPIN DYNAMICS IN SEARCH OF A CLASSICAL CONDENSATION OF WAVES ru_RU
dc.type Bachelor's thesis ru_RU


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