Search results for "Shubnikov–de Haas effect"

showing 3 items of 3 documents

Interaction-induced spin polarization in quantum dots.

2010

The electronic states of lateral many electron quantum dots in high magnetic fields are analyzed in terms of energy and spin. In a regime with two Landau levels in the dot, several Coulomb blockade peaks are measured. A zig-zag pattern is found as it is known from the Fock-Darwin spectrum. However, only data from Landau level 0 show the typical spin-induced bimodality, whereas features from Landau level 1 cannot be explained with the Fock-Darwin picture. Instead, by including the interaction effects within spin-density-functional theory a good agreement between experiment and theory is obtained. The absence of bimodality on Landau level 1 is found to be due to strong spin polarization.

Fock-Darwin spectrumSpin polarizationSpin-density-functional theoryQuantum DotGeneral Physics and AstronomyFOS: Physical sciencesElectronSpin dynamicsShubnikov–de Haas effectMesoscale and Nanoscale Physics (cond-mat.mes-hall)Electronic statesSemiconductor quantum dotsddc:530Landau levelsSpin-½PhysicsCondensed Matter - Mesoscale and Nanoscale PhysicsCondensed matter physicsSpin polarizationCoulomb blockadeHigh magnetic fieldsLandau quantizationCondensed Matter::Mesoscopic Systems and Quantum Hall EffectMagnetic fieldQuantum dotMagnetic fieldsDensity functional theoryDewey Decimal Classification::500 | Naturwissenschaften::530 | PhysikInteraction effectPhysical review letters
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Magnetoresistance studies of the ferromagnetic molecular metal (BEDT-TTF)3[MnCr(C2O4)3] under pressure

2003

(BEDT-TTF)3[MnCr(C2O4)3] is the first ferromagnetic molecular metal, in which organic layers of BEDT-TTF alternate with infinite layers of the bimetallic oxalate complex [MnCr(C2O4)3]-. While the bimetallic layer undergoes a magnetic phase transition into a canted ferromagnetic state at 5.5 K, the metallic character of the conductivity is not affected by the magnetic transition [Nature 408 (2000) 447]. We performed magnetoresistance measurements (B≤17 T) at low temperatures (T≥900 mK) and under hydrostatic pressures of up to 2.0 GPa. Oscillations in the magnetoresistance develop under pressure that can be interpreted as Shubnikov-de Haas oscillations, if an internal magnetic field is taken …

MagnetoresistanceCondensed matter physicsChemistryMagnetismMechanical EngineeringHydrostatic pressureMetals and AlloysConductivityCondensed Matter PhysicsThermal conductionShubnikov–de Haas effectElectronic Optical and Magnetic MaterialsMagnetic fieldFerromagnetismMechanics of MaterialsMaterials ChemistrySynthetic Metals
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Landau Fermi Liquid Theory and Beyond

2014

In this chapter we consider the Landau theory of the Fermi liquid that has a long history and remarkable results in describing a numerous properties of the electron liquid in ordinary metals and Fermi liquids of the \(^3\)He type. The theory is based on the assumption that elementary excitations determine the physics at low temperatures, resembling that of weakly interacting Fermi gas. These excitations behave as quasiparticles with a certain effective mass. The effective mass \(M^*\) exhibits a simple universal behavior, for it is independent of the temperature, pressure, and magnetic field strength and is a parameter of the theory. Microscopically deriving the equation determining the eff…

PhysicsEffective mass (solid-state physics)Condensed matter physicsElectron liquidQuantum oscillationsFermi liquid theoryLandau quantizationFermi gasShubnikov–de Haas effectLandau theory
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