1,030 research outputs found

    The Spin Mass of an Electron Liquid

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    We show that in order to calculate correctly the {\it spin current} carried by a quasiparticle in an electron liquid one must use an effective "spin mass" msm_s, that is larger than both the band mass, mbm_b, which determines the charge current, and the quasiparticle effective mass m‚ąóm^*, which determines the heat capacity. We present microscopic calculations of msm_s in a paramagnetic electron liquid in three and two dimensions, showing that the mass enhancement ms/mbm_s/m_b can be a very significant effect.Comment: 10 pages, 1 figur

    Why is the bandwidth of sodium observed to be narrower in photoemission experiments?

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    The experimentally predicted narrowing in the bandwidth of sodium is interpreted in terms of the non-local self-energy effect on quasi-particle energies of the electron liquid. The calculated self-energy correction is a monotonically increasing function of the wavenumber variable. The usual analysis of photo-emission experiments assumes the final state energies on the nearly-free-electron-like model and hence it incorrectly ascribes the non-local self-energy correction to the final state energies to the occupied state energies, thus leading to a seeming narrowing in the bandwidth.Comment: 9 page

    Extension of the measurable temperature range of the LHD Thomson scattering system

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    The large helical device Thomson scattering system was designed for the target electron temperature (Te) range, Te = 50 eV?10 keV. Above 10 keV, the experimental error becomes rapidly worse. In order to obtain reliable Te data in the temperature range above 10 keV, we are planning to extend the measurable Te range by following two methods. First we have installed one more wavelength channel that observes shorter wavelength region in polychromators. Next applying forward scattering configuration is another candidate. We estimate the data quality when the two methods are used. Both of the two methods are expected to improve Te data quality at Te ? 10 keV
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