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Effective mass (solid-state physics)
About: Effective mass (solid-state physics) is a research topic. Over the lifetime, 12539 publications have been published within this topic receiving 295485 citations.
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TL;DR: In this article, the effects of the Coulomb and electron-phonon interaction in metals are treated by completely parallel techniques, and explicit expressions are given for the electronic correlation functions in the limits ω 2> ωD and ω ⪡ ω D.
73 citations
TL;DR: In this paper, it was shown that off-mass-shell meson-nucleon scattering amplitudes obtained using the PCAC choice of pion field must not be viewed as fundamental constraints on the dynamics, the determination of the effective meson mass in nuclear matter or the possible existence of meson condensates in the ground state of nuclear matter.
73 citations
TL;DR: In this paper, the conduction and valence bands of porous silicon are shifted relative to the bands for bulk silicon, as expected in the quantum confinement model for the optical properties of the porous silicon.
Abstract: Photoemission and x‐ray absorption spectroscopy show that both the conduction and valence bands of porous silicon are shifted relative to the bands for bulk silicon, as expected in the quantum confinement model for the optical properties of porous silicon. The shift in the valence band is larger than the shift in the conduction band and proportional to it, with a proportionality constant that is consistent with effective mass theory. No oxygen is detected in the as‐prepared porous silicon.
73 citations
TL;DR: In this paper, the authors reported the enhanced p-type conduction properties in BiCuOSe by doping of monovalent ions (K+), which achieved simultaneous increase in both the carrier concentration and the Hall mobility.
Abstract: We report the enhanced p-type conduction properties in BiCuOSe by doping of monovalent ions (K+). As compared with undoped BiCuOSe, simultaneous increase in both the carrier concentration and the Hall mobility was achieved in the K-doped BiCuOSe. The origin of the enhancement was discussed in terms of the two-band structure in the valence band of the BiCuOSe, and the density of state effective masses of the heavy (∼1.1 me) and light hole (∼0.18 me) were estimated by using Pisarenko relation.
73 citations
TL;DR: Observations of quantum oscillations in single crystals of the high temperature superconductor MgB2 are reported, and it is found that the electron-phonon coupling strength lambda is a factor of approximately 3 larger for the c-axis tube orbits than for the in-plane network orbit, in accord with recent microscopic calculations.
Abstract: We report observations of quantum oscillations in single crystals of the high temperature superconductor ${\mathrm{MgB}}_{2}$. Three de Haas\char21{}van Alphen frequencies are clearly resolved. Comparison with band structure calculations strongly suggests that two of these come from a single warped Fermi surface tube along the $c$ direction, and that the third arises from cylindrical sections of an in-plane honeycomb network. The measured values of the effective mass range from $(0.44\char21{}0.68){m}_{e}$. By comparing these to calculated band masses, we find that the electron-phonon coupling strength $\ensuremath{\lambda}$ is a factor of $\ensuremath{\sim}3$ larger for the $c$-axis tube orbits than for the in-plane network orbit, in accord with recent microscopic calculations.
73 citations