Thermal fluctuations in the microwave conductivity of Bi2Sr2CaCu2O8

Theoretical Physic

Charged domain-wall dynamics in doped antiferromagnets and spin fluctuations in cuprate superconductors

Theoretical Physic

Fluctuation conductivity and Ginzburg-Landau parameters in high-temperature superconductors above Tc: Effect of strong inelastic scattering

Theoretical Physic

Charged Domain Wall Dynamics in Doped Antiferromagnets and the Spin Fluctuations in Cuprate Superconductors

Wetensch. publicatieFaculteit der Wiskunde en Natuurwetenschappe

Charged Domain Wall Dynamics in Doped Antiferromagnets and the Spin Fluctuations in Cuprate Superconductors

Wetensch. publicatieFaculteit der Wiskunde en Natuurwetenschappe

Comment on "Observation of the conductivity coherence peak in superconducting Bi2Sr2CaCu2O8 single crystals"

Theoretical Physic

Phenomenology of the superconducting state of a marginal Fermi liquid with BCS model interaction

Theoretical Physic

Charged domain-wall dynamics in doped antiferromagnets and spin fluctuations in cuprate superconductors

Wetensch. publicatieFaculteit der Wiskunde en Natuurwetenschappe

Quantum correction to the Kubo formula in closed mesoscopic systems

We study the energy dissipation rate in a mesoscopic system described by the parametrically-driven random-matrix Hamiltonian H[\phi(t)] for the case of linear bias \phi=vt. Evolution of the field \phi(t) causes interlevel transitions leading to energy pumping, and also smears the discrete spectrum of the Hamiltonian. For sufficiently fast perturbation this smearing exceeds the mean level spacing and the dissipation rate is given by the Kubo formula. We calculate the quantum correction to the Kubo result that reveals the original discreteness of the energy spectrum. The first correction to the system viscosity scales proportional to v^{-2/3} in the orthogonal case and vanishes in the unitary case.Comment: 4 pages, 3 eps figures, REVTeX

Current-density functional for disordered systems

The effective action for the current and density is shown to satisfy an evolution equation, the functional generalization of Callan-Symanzik equation. The solution describes the dependence of the one-particle irreducible vertex functions on the strength of the quenched disorder and the annealed Coulomb interaction. The result is non-perturbative, no small parameter is assumed. The a.c. conductivity is obtained by the numerical solution of the evolution equation on finite lattices in the absence of the Coulomb interaction. The static limit is performed and the conductivity is found to be vanishing beyond a certain threshold of the impurity strength.Comment: final version, 28 pages, 17 figures, to appear in Phys. Rev.