Resonance regime

Mesoscopic physics has defined many of the issues (Landauer limit transport [10, 11], Coulomb blockade regime [12], Kondo resonance regime [13-15]...) that will occur later in this chapter describing molecular transport junctions. These concepts are relevant, but must be reinterpreted to understand the molecular case. 

Fig. 8 The current asymmetry factor A2 as a function of the bridge site energy EB for the DBA system in the off-resonance regime, E% > 0.03. The parameters used in this calculation are Ed=Ea= 0, ft, = ft, = / A = 0.1, 1/DB = Tea = 0.01, E = -0.17, iVDB = 3, iVB = 2, Aba = 2. Coarse grained averaging was used to reduce numerical errors that results from computing small differences between relatively large numbers...

Figure 8 shows the current-transfer process in the DBA system for the off-resonance regime, EB > 0.03. In Fig. 8 the current transfer property decays quickly as we go into the off-resonance transfer regime. We find a strong exponential damping of the current transfer property expressed by the asymmetry factor A2. 

In the present contribution the discussion of the NLO response is restricted to off-resonant case. The only exception is the purely resonant quantity, namely imaginary part of second-order hyperpolarizability in the resonant regime (Im-y(-tt> tu, —w, w)). This quantity describes the process of simultaneous absorption of two quanta. The two-photon absorption (TPA) process is much better understood than the three-photon absorption. The basic quantity associated with the two-photon absorption process is the two-photon absorption tensor (S ). In the most general case referring to two different photons (different polarizations and different energies is given by [75, 81] ... 

Comparing results from different techniques is difficult. First, the tensorial character of x has to be taken into account, x is a fourth-rank tensor, which means that it has 81 components. In isotropic media there are only three independent components, Axyxy and Tixw in the case of purely electronic contributions in the off-resonance regime the components are further related xJv v =... 

The wave effects concerning the organization of a controlled tubulization in a resonance regime in multiphase systems, three-dimensional current and deagglomeration of associates, lead to obtaining dispersions with narrower particle size distribution and, consequently, more homogeneous films with an increased level of physicomechanical properties. 

The explanation of observed effects of modifying influence of vibrowave treatment on multiphase systems which is carried out by the direct excitation of nonlinear vibrations in a resonant regime and is observed further at the formation of properties of films and other compositions based on the dispersions, undergone by the vibrowave treatment, it is possible to explain by the occurance of the factor of "memory" as an element of hereditary mechanics [16-18], The carrier of such a "memory" is the structural-morphological organization of the examined multiphase systems, and the influence of wave action in a sound range of frequencies is observed at different levels of the structural organization. 

Due to these interactions, and ff J, the phonon frequencies are renormalized by virtual-electron excitations. As indicated before this is done separately in the quasiparticle and resonance regimes. In the former (T T ) the phonons will be renormalized by the coupling to quasiparticle hole excitations. This leads to a longitudinal phonon self-energy ... 

The Griineisen parameter has been introduced via eqs. (118) and (119). Similar formulae hold in the resonance regime T T ) and an interpolation may be used for intermediate temperatures (Thalmeier 1987). 

In the quasi-resonant regime, the frequency of the laser field is close to the transition frequency between the (0) ) and (2 ) ) states, as featured by the... 

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