Charge Carrier Transport in Disordered Polymers

General properties of charge carrier transport in disordered organic materials are discussed. Spatial correlation between energies of transport sites determines the form of the drift mobility field dependence. Particular kind of spatial correlation in a disordered material depends on its nature. Mobility field dependences have to be different in polar and nonpolar materials. Different methods of mobility calculation from the shape of photocurrent transient are analyzed. A widely used method is very sensitive to the variation of the shape of the transient and sometimes produces results that effectively masquerade the true dependence of the mobility on electric field or trap concentration. Arguments in favor of the better, more reliable method are suggested. Charge transport in materials containing charged traps is considered without using the isolated trap approximation and this leads to qualitatively different results. They indicate that the effect of charged traps can hardly be responsible for experimentally observed transport properties of disordered organic materials.Comment: 17 pages, 7 figure

Diffusion of a particle in the spatially correlated exponential random energy landscape: transition from normal to anomalous diffusion

Diffusive transport of a particle in spatially correlated random energy landscape having exponential density of states has been considered. We exactly calculate the diffusivity in the nondispersive quasi-equilibrium transport regime and found that for slow decaying correlation functions the diffusivity becomes singular at some particular temperature higher than the temperature of the transition to the true non-equilibrium dispersive transport regime. It means that the diffusion becomes anomalous and does not follow the usual $\propto t^{1/2}$ law. In such situation the fully developed non-equilibrium regime emerges in two stages: first, at some temperature there is the transition from the normal to anomalous diffusion, and then at lower temperature the average velocity for the infinite medium goes to zero, thus indicating the development of the true dispersive regime. Validity of the Einstein relation is discussed for the situation where the diffusivity does exist.Comment: 24 pages, 8 figure

Binary systems in QM and in QFT: CPT

Quasi-degenerate neutral systems like a (K, \bar{K}) type are investigated in Quantum Field Theory (QFT). A constant mass matrix as the one used in Quantum Mechanics (QM) can only be introduced as a linear approximation to QFT. We study the phenomenological consequences of the differences between the QFT and QM treatments. The role of ``spurious'' states with zero norm at the poles is emphasized. The K_L-K_S mass splitting triggers a tiny difference between the CP violating parameters \epsilon_L and \epsilon_S, without any violation of TCP. Non-vanishing semi-leptonic asymmetry delta_S - \delta_L does not signal TCP violation (usual claims not withstanding), while A_{TCP} keeps vanishing when TCP is good symmetry.Comment: 13 pages, LaTe

Extra Generations, Discrepancies of Electroweak Precision Data and Mass of the Higgs

The latest electroweak precision data are analyzed assuming the existence of the fourth generation of leptons ($N, E$) and quarks ($U, D$), which are not mixed with the known three generations. If all four new particles are heavier than $Z$ boson, quality of the fit for the one new generation is as good as for the Standard Model. In the case of neutral leptons with masses around 50 GeV (``partially heavy extra generations'') the minimum of $\chi^2$ is between one and two extra generations. The predicted value of the higgs mass $m_H$ in the presence of the fourth generation can be made rather large. The quality of fits drastically improves when the data on b- and c-quark asymmetries and new NuTeV data on deep inelastic scattering are ignored.Comment: 12 paghes, 6 figures, Talk at Les Rencontres de Physique de la Valle d'Aoste 200

Bounds on the New Generations

We consider the bounds for the values of higgs mass $m_H$ and the mass of the extra quarks and leptons $m_{extra}$ derived from the stability of electroweak vacuum and from the absence of Landau pole in Higgs potential. We find that in the case of the absence of new physics up to the GUT scale the bounds on masses of 4th generation are so strong that one can hope to discover it at LEP2.Comment: 6 pages, LaTeX with epsf, 2 figures; To be published in proceedings of 31st Recontres de Moriond, Les Arcs, Franc

Hopping charge transport in amorphous semiconductors with the spatially correlated exponential density of states

Hopping charge transport in amorphous semiconductors having spatially correlated exponential density of states has been considered. Average carrier velocity is exactly calculated for the quasi-equilibrium (nondispersive) transport regime. We suggest also a heuristic approach for the consideration of the carrier velocity for the non-equilibrium dispersive regime.Comment: 21 pages, 3 figure

Quadrupolar glass as a model for charge carrier transport in nonpolar organic materials

Monte Carlo simulation of the charge carrier transport in disordered nonpolar organic materials has been carried out. As a suitable model we considered the model of quadrupolar glass. A general formula for the temperature and field dependence of the mobility was suggested. A comparison with experimental data has been carried out.Comment: 4 pages, 2 figure

On decomposition of commutative Moufang groupoids

We prove that every commutative Moufang groupoid is a semilattice of Archimedean subgroupoids.Comment: 5 pages, Late

Optical activity of a neutrino sea in the Standard Model

We present the Standard Model calculation of the optical activity of a neutrino seaComment: 7 pages, 3 figure

Relativistic and Quantum Properties of Spatial Rotations

The principles of the physical description of non-inertial frames of reference are analyzed. The systems of physical reality description (PhRD) are introduced on base of generalization of the relativistic principle in special and general theories of relativity. Physical objects and their interactions from different systems of PhRD are examined. A lot of conformities between considered objects and their interactions with known physical objects and fundamental interactions both in micro- and macro-scales are found.Comment: Presented talk at sc.conf."Physics of fundamental interactions", ITEP, Moscow, on December 5-9, 200