0000000000223955

AUTHOR

Elham Khosravi

showing 3 related works from this author

Correlation effects in bistability at the nanoscale: Steady state and beyond

2012

The possibility of finding multistability in the density and current of an interacting nanoscale junction coupled to semi-infinite leads is studied at various levels of approximation. The system is driven out of equilibrium by an external bias and the nonequilibrium properties are determined by real-time propagation using both time-dependent density functional theory (TDDFT) and many-body perturbation theory (MBPT). In TDDFT the exchange-correlation effects are described within a recently proposed adiabatic local density approximation (ALDA). In MBPT the electron-electron interaction is incorporated in a many-body self-energy which is then approximated at the Hartree-Fock (HF), second-Born,…

PhysicsSteady state (electronics)ta114Condensed Matter - Mesoscale and Nanoscale PhysicsBistabilityTime evolutionFOS: Physical sciences02 engineering and technologyTime-dependent density functional theory021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciencesSettore FIS/03 - Fisica della MateriaElectronic Optical and Magnetic MaterialsQuantum mechanicsMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciencesDensity functional theoryPerturbation theoryLocal-density approximation010306 general physics0210 nano-technologyMultistabilityPhysical Review B
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Real-time switching between multiple steady-states in quantum transport

2010

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PhysicsHistoryCondensed Matter - Mesoscale and Nanoscale PhysicsBistabilityBandwidth (signal processing)FOS: Physical sciencesNon-equilibrium thermodynamicsModel systemBiasing02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesSettore FIS/03 - Fisica della MateriaComputer Science ApplicationsEducationQuantum transportMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciencesTime switchingStatistical physics010306 general physics0210 nano-technologyJournal of Physics: Conference Series
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Comparative study of many-body perturbation theory and time-dependent density functional theory in the out-of-equilibrium Anderson model

2011

We study time-dependent electron transport through an Anderson model. The electronic interactions on the impurity site are included via the self-energy approximations at Hartree-Fock (HF), second Born (2B), GW, and T-matrix levels as well as within a time-dependent density functional (TDDFT) scheme based on the adiabatic Bethe-ansatz local density approximation (ABALDA) for the exchange-correlation potential. The Anderson model is driven out of equilibrium by applying a bias to the leads, and its nonequilibrium dynamics is determined by real-time propagation. The time-dependent currents and densities are compared to benchmark results obtained with the time-dependent density matrix renormali…

PhysicsCondensed Matter - Mesoscale and Nanoscale Physicsta114Non-equilibrium thermodynamicsFOS: Physical sciences02 engineering and technologyTime-dependent density functional theory021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciencesMany bodySettore FIS/03 - Fisica della MateriaElectronic Optical and Magnetic MaterialsCondensed Matter - Other Condensed MatterQuantum mechanicsQuantum electrodynamics0103 physical sciencesMesoscale and Nanoscale Physics (cond-mat.mes-hall)Local-density approximationPerturbation theory010306 general physics0210 nano-technologyAdiabatic processAnderson impurity modelOther Condensed Matter (cond-mat.other)
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