Electron spin as a spectrometer of nuclear spin noise and other fluctuations

This chapter describes the relationship between low frequency noise and coherence decay of localized spins in semiconductors. Section 2 establishes a direct relationship between an arbitrary noise spectral function and spin coherence as measured by a number of pulse spin resonance sequences. Section 3 describes the electron-nuclear spin Hamiltonian, including isotropic and anisotropic hyperfine interactions, inter-nuclear dipolar interactions, and the effective Hamiltonian for nuclear-nuclear coupling mediated by the electron spin hyperfine interaction. Section 4 describes a microscopic calculation of the nuclear spin noise spectrum arising due to nuclear spin dipolar flip-flops with quasiparticle broadening included. Section 5 compares our explicit numerical results to electron spin echo decay experiments for phosphorus doped silicon in natural and nuclear spin enriched samples.Comment: Book chapter in "Electron spin resonance and related phenomena in low dimensional structures", edited by Marco Fanciulli. To be published by Springer-Verlag in the TAP series. 35 pages, 9 figure

Innovative methods of managing the company’s financial results

The article investigates the experience of using innovative methods of managing financial results in a joint venture and the possibility of using these methods at a Russian enterprise. The importance of managing financial results for an individual enterprise and for the country’s economy as a whole is indicated. The research includes CVP analysis of the enterprise, DuPont model, and profitability analysis of the enterprise. The authors make conclusions about the applicability of classical and innovative methods at each of the considered enterprises. Recommendations for managing financial results within the research object are proposed, their effectiveness is calculated, and the repeated CVP analysis was performed based on the expected results. It is concluded that these measures will be effective for the company in various ways. They can be implemented together or separately. However, their combined effect may differ from the sum of the effects