19 research outputs found
Spectral properties of quasi-one-dimensional conductors with a finite transverse band dispersion
We determine the one-particle spectral function and the corresponding derived
quantities for the conducting chain lattice with the finite inter-chain hopping
and the three-dimensional long-range Coulomb electron-electron
interaction. The standard approximation is used. It is shown that,
due to the optical character of the anisotropic plasmon dispersion caused by
the finite , the low energy quasi-particle -peak appears in
the spectral function in addition to the hump present at the energies of the
order of plasmon energy. The particular attention is devoted to the continuous
cross-over from the non-Fermi liquid to the Fermi liquid regime by increasing
. It is shown that the spectral weight of the hump transfers to the
quasi-particle as the optical gap in the plasmon dispersion increases together
with , with the quasi-particle residuum behaving like in the limit . Our approach is appropriate for
the wide range of energy scales given by the plasmon energy and the width of
the conduction band, and is complementary to the Luttinger liquid techniques
that are limited to the low energy regime close to the Fermi surface
Kirchhoff's Loop Law and the maximum entropy production principle
In contrast to the standard derivation of Kirchhoff's loop law, which invokes
electric potential, we show, for the linear planar electric network in a
stationary state at the fixed temperature,that loop law can be derived from the
maximum entropy production principle. This means that the currents in network
branches are distributed in such a way as to achieve the state of maximum
entropy production.Comment: revtex4, 5 pages, 2 figure
On the validity of entropy production principles for linear electrical circuits
We discuss the validity of close-to-equilibrium entropy production principles
in the context of linear electrical circuits. Both the minimum and the maximum
entropy production principle are understood within dynamical fluctuation
theory. The starting point are Langevin equations obtained by combining
Kirchoff's laws with a Johnson-Nyquist noise at each dissipative element in the
circuit. The main observation is that the fluctuation functional for time
averages, that can be read off from the path-space action, is in first order
around equilibrium given by an entropy production rate. That allows to
understand beyond the schemes of irreversible thermodynamics (1) the validity
of the least dissipation, the minimum entropy production, and the maximum
entropy production principles close to equilibrium; (2) the role of the
observables' parity under time-reversal and, in particular, the origin of
Landauer's counterexample (1975) from the fact that the fluctuating observable
there is odd under time-reversal; (3) the critical remark of Jaynes (1980)
concerning the apparent inappropriateness of entropy production principles in
temperature-inhomogeneous circuits.Comment: 19 pages, 1 fi
Bacterial chemotaxis and entropy production
Entropy production is calculated for bacterial chemotaxis in the case of a migrating band of bacteria in a capillary tube. It is found that the speed of the migrating band is a decreasing function of the starting concentration of the metabolizable attractant. The experimentally found dependence of speed on the starting concentration of galactose, glucose and oxygen is fitted with power-law functions. It is found that the corresponding exponents lie within the theoretically predicted interval. The effect of the reproduction of bacteria on band speed is considered, too. The acceleration of the band is predicted due to the reproduction rate of bacteria. The relationship between chemotaxis, the maximum entropy production principle and the formation of self-organizing structure is discussed
Crystal stability and optical properties of organic chain compounds
The solution to the long-standing problem of the cohesion of
organic chain compounds is proposed. We consider the tight-binding
dielectric matrix with two electronic bands per chain, determine the
corresponding hybridized collective modes, and show that three
among them are considerably softened due to strong dipole-dipole and
monopole-dipole interactions. By this we explain the unusual low-frequency
optical activity of TTF-TCNQ, including the observed 10 meV anomaly.
The softening of the modes also explains the cohesion of the mixed-stack
lattice, the fractional charge transfer almost independent of the material,
and the formation of the charged sheets in some compounds