Electrons Fermi velocity

In figure 3 we compare the time evolution of various electronic observables the dipole signal along the axis joining the projectile to the cluster s center of mass, the number of escaping elect.vons Nesc(t), and ionization probabilities. Results are shown for a typical test case of a Ar8+ projectile on a Nay cluster. The projectile velocity is v = 50 ao/fs, about, twice the electronic Fermi velocity vf and impact parameter is b = 22. The... 

Abstract. We compute the velocity correlation function of electronic states close to the Fermi energy, in approximants of quasicrystals. As we show the long time value of this correlation function is small. This means a small Fermi velocity, in agreement with previous band structure studies. Furthermore the correlation function is negative on a large time interval which means a phenomenon of backscattering. As shown in previous studies the backscattering can explain unusual conduction properties, observed in these alloys, such as for example the increase of conductivity with disorder. 

Another way to P takes into account the Fermi velocities of the up spin and down spin electrons as well. Since we use P as a phenomenogical fitting parameter, the detailed definition of P is not of concern here. 

Fig. 1. Schematic energy spectrum of ID electrons with dispersion asymmetry. The particles with energies close to the Fermi energy f have an almost linear dependence on momentum and are classified by their Fermi velocities (vif - subband 1, V2F -subband 2).

The multiband superconductivity shows up only in the clean limit , where the single electron mean free path for the interband impurity scattering satisfies the condition / > hvF/Aav where vF is the Fermi velocity and Aav is the average superconducting gap [24,28,30,35],... 

Another effect of the electron-phonon interaction is a shift in the velocity of the electrons at the Fermi surface, in some ways analogous to the polaron effect in ionic crystals. Because of the wake of lattice distortion that accompanies the electron, its velocity is reduced, as it turns out, by a factor (I -t A) E (I- or a discussion of this effect, and references, sec Quinn, 1960, p. 58, oi Harrison, 1970, p. 418ff.) The reduction in velocity corresponds to a decrease in dE/dk at the Fermi surface and, therefore, to an increase in the density of stales by the same factor. We noted in Chapter 15 that the electronic specific heal is proportional to the density of states, so we may expect an enhancement of the experimental... 

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