Search results for "Wiedemann–Franz law"

showing 3 items of 3 documents

Electron-phonon heat transport and electronic thermal conductivity in heavily doped silicon-on-insulator film

2003

Electron–phonon interaction and electronic thermal conductivity have been investigated in heavily doped silicon at subKelvin temperatures. The heat flow between electron and phonon systems is found to be proportional to T6. Utilization of a superconductor–semiconductor–superconductor thermometer enables a precise measurement of electron and substrate temperatures. The electronic thermal conductivity is consistent with the Wiedemann–Franz law. Peer reviewed

Materials scienceSiliconPhononphononsGeneral Physics and AstronomySilicon on insulatorchemistry.chemical_elementSubstrate (electronics)dopingsuperconductorsCondensed Matter::Materials ScienceThermal conductivityCondensed Matter::Superconductivitythermal conductivitySOICondensed matter physicsPhysicsDopingelectronsThermal conductionCondensed Matter::Mesoscopic Systems and Quantum Hall EffectWiedemann-Franz lawsilicon-on-insulatorchemistryelectron-phonon interactionssilicon dopingelemental semiconductorsWiedemann–Franz lawheat transportheavily doped semiconductors
researchProduct

Thermal Transport and Wiedemann-Franz Law in the Disordered Fermi Liquid

2014

We study thermal transport in the disordered Fermi liquid at low temperatures. Gravitational potentials are used as sources for finding the heat density and its correlation function. For a comprehensive study, we extend the renormalization group (RG) analysis developed for electric transport by including the gravitational potentials into the RG scheme. Our analysis reveals that the Wiedemann-Franz law remains valid even in the presence of quantum corrections caused by the interplay of diffusion modes and the electron electron interaction. In the present scheme this fundamental relation is closely connected with a fixed point in the multi-parametric RG-flow of the gravitational potentials.

PhysicsField (physics)Condensed matter physicsCondensed Matter - Mesoscale and Nanoscale PhysicsStrongly Correlated Electrons (cond-mat.str-el)SigmaFOS: Physical sciencesCondensed Matter::Mesoscopic Systems and Quantum Hall EffectCondensed Matter Physics530Electronic Optical and Magnetic MaterialsGravitationNonlinear systemCondensed Matter - Strongly Correlated ElectronsThermal transportCondensed Matter::SuperconductivityQuantum mechanicsMesoscale and Nanoscale Physics (cond-mat.mes-hall)Fermi liquid theoryWiedemann–Franz lawFermi Gamma-ray Space Telescope
researchProduct

Violation of the Wiedemann-Franz Law in HF Metals

2014

Experimental observations of the much-studied compounds CeCoIn\(_5\) and YbRh\(_2\)Si\(_2\) at vanishing temperatures carefully probe the nature of their magnetic-field-tuned QCPs. The violation of Wiedemann-Franz (WF) law, along with jumps revealed both in the residual resistivity \(\rho _0\) and the Hall resistivity \(R_H\), provide vital clues to the origin of their non-Fermi-liquid behavior. The empirical facts point unambiguously to association of the observed QCP with FC forming flat bands.

PhysicsResidual resistivityCondensed matter physicsElectrical resistivity and conductivitySeebeck coefficientLorenz numberFermi liquid theoryFlat bandWiedemann–Franz lawPhase diagram
researchProduct