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Excitation Spectrum in Singlet-Triplet Ferromagnetic Systems
並列摘要
The dynamic properties of a single-triplet ferromagnetic system are studied by the method of double-time Green's functions. Utilizing the standard basis operator formalism to describe the singlet-triplet levels, a Dyson equation for the single-particle Green's function is obtained. This equation describes the magnetic excitations in the system for low temperatures. AS an application, the self-energy is calculated approximately to yield the damping of the excitations at zero temperature.
並列關鍵字
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