The microscopic physics behind low lattice thermal conductivity of single crystal rocksalt lead telluride (PbTe) is investigated. Mode-dependent phonon (normal and umklapp) scattering rates and their impact on thermal conductivity were quantified by the first-principles-based anharmonic lattice dynamics calculations that accurately reproduce thermal conductivity in a wide temperature range. The low thermal conductivity of PbTe is attributed to the scattering of longitudinal acoustic phonons by transverse optical phonons with large anharmonicity, and small group velocity of the soft transverse acoustic phonons. This results in enhancing the relative contribution of optical phonons, which are usually minor heat carrier in bulk materials.
We present theoretical description of conduction electrons interacting with a
domain wall in ferromagnetic metals. The description takes into account
interaction between electrons. Within the semiclassical approximation we
calculate the spin and charge distributions, particularly their modification by
the domain wall. In the same approximation we calculate local transport
characteristics, including relaxation times and charge and spin conductivities.
It is shown that these parameters are significantly modified near the wall and
this modification depends on electron-electron interaction.Comment: 10 pages with 4 figure
A model of the Datta-Das spin field-effect transistor is presented which, in
addition to the Rashba interaction, takes into account the influence of bulk
inversion asymmetry of zinc-blende semiconductors. In the presence of bulk
inversion asymmetry, the conductance is found to depend significantly on the
crystallographic orientation of the channel. We determine the channel direction
optimal for the observation of the Datta-Das effect in GaAs and InAs-based
devices.Comment: 4 pages, Revtex4, 4 EPS figure
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