Electron-phonon interaction in the three-band model
نویسندگان
چکیده
منابع مشابه
Temperature dependence of band gaps in semiconductors: Electron-phonon interaction
We have theoretically investigated, by ab initio techniques, the phonon properties of several semiconductors with chalcopyrite structure. Comparison with experiments has led us to distinguish between materials with d electrons in the valence band (e.g., CuGaS2, AgGaS2) and those without d electrons (e.g., ZnSnAs2). The former exhibit a rather peculiar nonmonotonic temperature dependence of the ...
متن کاملTemperature dependence of band gaps in semiconductors: electron-phonon interaction
Most of the experimental results for the temperature dependence of gaps have been obtained for elemental or binary semiconductors.[1] Lately, however, ternary materials such as those with chalcopyrite structure have begun to be investigated. Among the chalcopyrites under examination are II-IV-V2 compounds (e.g. ZnGeAs2) and those in which the divalent cation is replaced by either monovalent cop...
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A finite chain calculation in terms of Hubbard X-operators is explored by setting up a vibronic Harniltonian. The model conveniently transformed into a form so that in the case of strong coupling a numerical renormalization group approach is applicable. To test the technique, a one particle Green function is calculated for the model Harniltonian
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We derive a t-J model with electron-phonon coupling from the three-band model, considering modulation of both hopping and Coulomb integrals by phonons. While the modulation of the hopping integrals dominates, the modulation of the Coulomb integrals cannot be neglected. The model explains the experimentally observed anomalous softening of the half-breathing mode upon doping and a weaker softenin...
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We calculate the tunneling density of states (DOS) of MgB2 for different tunneling directions, by directly solving the real-axis, two-band Eliashberg equations (EE). Then we show that the numeric inversion of the standard singleband EE, if applied to the DOS of the two-band superconductor MgB2, may lead to wrong estimates of the strength of certain phonon branches (e.g. the E2g) in the extracte...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 2004
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.70.224518