Overview of spectroscopies I (MC) - TDDFT.org

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Why is the electron-phonon interaction so muchstronger in diamond than in germanium or silicon?The large e-p interaction with the top of the valence bandseems to be a property of the elements of the second row ofthe periodic table ( carbon, nitrogen, oxygen…). We shall seenext that that the e-p interaction, as obtained from thedependence of the gap on T and on M, is also large in GaN ain ZnO and, as will be seen later, in SiC.Handwaving argument:C, N, O.. have no p-electrons in the core and the p valence electrons, as the atomsvibrate, can get much closer to the core than in cases where p-electronsare present in the core: germanium, silicon, GaAs….22
Another possible heuristic explanation is that for materialswith atoms of the second row the gaps are large. In pert.theory intraband and interband terms contribute to theself-energy. Usually (Ge, Si) they compensate each other.For large gaps intraband terms increase, interband onesdecrease and the sum can become larger.IntrabandInterbandThe two heuristic explanations may beequivalent in some way !interband23
Page 1 and 2: Manuel Cardona, Max-Planck- Institu
Page 3 and 4: Benedict, Shirley, Bohn, PRB 57, R9
Page 5 and 6: Albrecht et al. PRL 80.4510(1998)Ca
Page 7 and 8: Comparison of calculated with measu
Page 9 and 10: Three electron-phonon interaction t
Page 11: A single crystal of 29 Si (5% natur
Page 14 and 15: 2.9meVParks et al. PRB49,14244(1994
Page 16 and 17: 7.37.27.4ΔE = 0.7 eVClassical mole
Page 18 and 19: Although no isotope effect measurem
Page 20 and 21: Fermi Surface of diamond and electr
Page 24 and 25: 2.9meVParks et al. PRB49,14244(1994
Page 26 and 27: Superconductivity in boron-doped si
Page 28 and 29: Specific heat of diamond vs.T: Eins
Page 30 and 31: Luis Viňa (Stuttgart, 1981)Patrici
Page 32 and 33: Contribution of zinc and oxygen to
Page 34 and 35: Periodic Table ( Section)Mg Al Si P
Page 36 and 37: Sharp indirect edge luminescence in
Page 38 and 39: DIAMONDT. Sato et al. PRB 65, 09210
Page 40 and 41: 90 meV, confirmed by isotope measur

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