0000000000408041

AUTHOR

Eugene M. Chudnovsky

showing 6 related works from this author

Superradiance from crystals of molecular nanomagnets

2002

We show that crystals of molecular nanomagnets can exhibit giant magnetic relaxation due to the Dicke superradiance of electromagnetic waves. Rigorous treatment of the superradiance induced by a field pulse is presented.

PhysicsCondensed Matter::Quantum GasesMolecular magnetsCondensed matter physicsStatistical Mechanics (cond-mat.stat-mech)Molecular nanomagnetsCondensed Matter::OtherGeneral Physics and AstronomyPhysics::OpticsFOS: Physical sciencesSuperradiance02 engineering and technology021001 nanoscience & nanotechnologyCondensed Matter::Mesoscopic Systems and Quantum Hall Effect01 natural sciencesElectromagnetic radiation3. Good healthQuantum mechanics0103 physical sciencesMagnetic relaxation010306 general physics0210 nano-technologyCondensed Matter - Statistical Mechanics
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Phonon superradiance and phonon laser effect in nanomagnets

2004

We show that the theory of spin-phonon processes in paramagnetic solids must take into account the coherent generation of phonons by the magnetic centers. This effect should drastically enhance spin-phonon rates in nanoscale paramagnets and in crystals of molecular nanomagnets.

PhononMany-body theoryFOS: Physical sciencesGeneral Physics and Astronomy02 engineering and technology01 natural scienceslaw.inventionParamagnetismCondensed Matter::Materials ScienceComputer Science::Emerging TechnologieslawCondensed Matter::SuperconductivityMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciences010306 general physicsPhysicsCondensed Matter - Materials ScienceCondensed matter physicsCondensed Matter - Mesoscale and Nanoscale PhysicsMolecular nanomagnetsMaterials Science (cond-mat.mtrl-sci)Superradiance021001 nanoscience & nanotechnologyLaserCondensed Matter::Mesoscopic Systems and Quantum Hall EffectNanomagnetFerromagnetismCondensed Matter::Strongly Correlated Electrons0210 nano-technology
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Universal mechanism of spin relaxation in solids

2005

We consider relaxation of a rigid spin cluster in an elastic medium in the presence of the magnetic field. Universal simple expression for spin-phonon matrix elements due to local rotations of the lattice is derived. The equivalence of the lattice frame and the laboratory frame approaches is established. For spin Hamiltonians with strong uniaxial anisotropy the field dependence of the transition rates due to rotations is analytically calculated and its universality is demonstrated. The role of time reversal symmetry in spin-phonon transitions has been elucidated. The theory provides lower bound on the decoherence of any spin-based solid-state qubit.

PhysicsCondensed Matter - Materials ScienceQuantum decoherenceStatistical Mechanics (cond-mat.stat-mech)Condensed matter physicsSpin polarizationMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciencesCondensed Matter Physics01 natural sciencesUpper and lower bounds010305 fluids & plasmasElectronic Optical and Magnetic MaterialsUniversality (dynamical systems)Magnetic fieldLattice (order)QubitQuantum mechanics0103 physical sciencesCondensed Matter::Strongly Correlated Electrons010306 general physicsAnisotropyCondensed Matter - Statistical MechanicsPhysical Review B
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Pulsed-field studies of the magnetization reversal in molecular nanomagnets

2004

We report experimental studies of crystals of Mn12 molecular magnetic clusters in pulsed magnetic fields with sweep rates up to 4x10^3 T/s. The steps in the magnetization curve are observed at fields that are shifted with respect to the resonant field values. The shift systematically increases as the rate of the field sweep goes up. These data are consistent with the theory of the collective dipolar relaxation in molecular magnets.

PhysicsCondensed matter physicsField (physics)Molecular magnetsPropietats magnètiquesEnergy level splittingMagnetization reversalFOS: Physical sciences02 engineering and technologyNanostructured materials021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciencesElectronic Optical and Magnetic MaterialsMagnetic fieldCondensed Matter - Other Condensed MatterTunnel effectMagnet0103 physical sciencesMagnetic propertiesMaterials nanoestructurats010306 general physics0210 nano-technologySingle crystalOther Condensed Matter (cond-mat.other)
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Field Dependence of the Electron Spin Relaxation in Quantum Dots

2005

Interaction of the electron spin with local elastic twists due to transverse phonons has been studied. Universal dependence of the spin relaxation rate on the strength and direction of the magnetic field has been obtained in terms of the electron gyromagnetic tensor and macroscopic elastic constants of the solid. The theory contains no unknown parameters and it can be easily tested in experiment. At high magnetic field it provides parameter-free lower bound on the electron spin relaxation in quantum dots.

PhysicsCondensed Matter - Materials ScienceCondensed matter physicsSpin polarizationStatistical Mechanics (cond-mat.stat-mech)Relaxation (NMR)General Physics and AstronomyMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciences02 engineering and technologyElectronZero field splitting021001 nanoscience & nanotechnology01 natural sciences7. Clean energyElectron magnetic dipole momentSpin magnetic momentQuantum dot0103 physical sciencesSpinplasmonics010306 general physics0210 nano-technologyCondensed Matter - Statistical Mechanics
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Quantum dynamics of a nanomagnet in a rotating field

2005

Quantum dynamics of a two-state spin system in a rotating magnetic field has been studied. Analytical and numerical results for the transition probability have been obtained along the lines of the Landau-Zener-Stueckelberg theory. The effect of various kinds of noise on the evolution of the system has been analyzed.

PhysicsCondensed Matter - Materials ScienceRotating magnetic fieldCondensed Matter - Mesoscale and Nanoscale PhysicsCondensed matter physicsField (physics)Quantum dynamicsMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciencesQuantum Hall effectCondensed Matter Physics01 natural sciencesNoise (electronics)Nanomagnet010305 fluids & plasmasElectronic Optical and Magnetic MaterialsBackground noiseSpin crossoverMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciences010306 general physicsPhysical Review B
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