The Experts below are selected from a list of 157050 Experts worldwide ranked by ideXlab platform
Maria Chamarro - One of the best experts on this subject based on the ideXlab platform.
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Hole-Spin dephasing time associated with hyperfine Interaction in quantum dots
Physical Review B : Condensed matter and materials physics, 2009Co-Authors: Christophe Testelin, Benoît Eble, Frédéric Bernardot, Maria ChamarroAbstract:The Spin Interaction of a hole confined in a quantum dot with the surrounding nuclei is described in terms of an effective magnetic field. We show that, in contrast to the Fermi contact hyperfine Interaction for conduction electrons, the dipole-dipole hyperfine Interaction is anisotropic for a hole, for both pure or mixed hole states. We evaluate the coupling constants of the hole-nuclear Interaction and demonstrate that they are only 1 order of magnitude smaller than the coupling constants of the electron-nuclear Interaction. We also study, theoretically, the hole-Spin dephasing of an ensemble of quantum dots via the hyperfine Interaction in the framework of frozen fluctuations of the nuclear field, in the absence or in the presence of an applied magnetic field. We also discuss experiments which could evidence the dipole-dipole hyperfine Interaction and give information on hole mixing.
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Hole-Nuclear Spin Interaction in Quantum Dots
Physical Review Letters, 2009Co-Authors: Benoît Eble, Th Amand, Pascal Desfonds, Christophe Testelin, Andrea Balocchi, Xavier Marie, Audrey Miard, Aristide Lemaître, Frédéric Bernardot, Maria ChamarroAbstract:We have measured the carrier Spin dynamics in p-doped InAs/GaAs quantum dots by pump-probe and time-resolved photoluminescence experiments. We obtained experimental evidence of the hyperfine Interaction between hole and nuclear Spins. In the absence of an external magnetic field, our calculations based on dipole-dipole coupling between the hole and the quantum dot nuclei lead to a hole-Spin dephasing time for an ensemble of dots of 14 ns, in close agreement with experiments.
Benoît Eble - One of the best experts on this subject based on the ideXlab platform.
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Hole-Spin dephasing time associated with hyperfine Interaction in quantum dots
Physical Review B : Condensed matter and materials physics, 2009Co-Authors: Christophe Testelin, Benoît Eble, Frédéric Bernardot, Maria ChamarroAbstract:The Spin Interaction of a hole confined in a quantum dot with the surrounding nuclei is described in terms of an effective magnetic field. We show that, in contrast to the Fermi contact hyperfine Interaction for conduction electrons, the dipole-dipole hyperfine Interaction is anisotropic for a hole, for both pure or mixed hole states. We evaluate the coupling constants of the hole-nuclear Interaction and demonstrate that they are only 1 order of magnitude smaller than the coupling constants of the electron-nuclear Interaction. We also study, theoretically, the hole-Spin dephasing of an ensemble of quantum dots via the hyperfine Interaction in the framework of frozen fluctuations of the nuclear field, in the absence or in the presence of an applied magnetic field. We also discuss experiments which could evidence the dipole-dipole hyperfine Interaction and give information on hole mixing.
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Hole-Nuclear Spin Interaction in Quantum Dots
Physical Review Letters, 2009Co-Authors: Benoît Eble, Th Amand, Pascal Desfonds, Christophe Testelin, Andrea Balocchi, Xavier Marie, Audrey Miard, Aristide Lemaître, Frédéric Bernardot, Maria ChamarroAbstract:We have measured the carrier Spin dynamics in p-doped InAs/GaAs quantum dots by pump-probe and time-resolved photoluminescence experiments. We obtained experimental evidence of the hyperfine Interaction between hole and nuclear Spins. In the absence of an external magnetic field, our calculations based on dipole-dipole coupling between the hole and the quantum dot nuclei lead to a hole-Spin dephasing time for an ensemble of dots of 14 ns, in close agreement with experiments.
Christophe Testelin - One of the best experts on this subject based on the ideXlab platform.
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Hole-Spin dephasing time associated with hyperfine Interaction in quantum dots
Physical Review B : Condensed matter and materials physics, 2009Co-Authors: Christophe Testelin, Benoît Eble, Frédéric Bernardot, Maria ChamarroAbstract:The Spin Interaction of a hole confined in a quantum dot with the surrounding nuclei is described in terms of an effective magnetic field. We show that, in contrast to the Fermi contact hyperfine Interaction for conduction electrons, the dipole-dipole hyperfine Interaction is anisotropic for a hole, for both pure or mixed hole states. We evaluate the coupling constants of the hole-nuclear Interaction and demonstrate that they are only 1 order of magnitude smaller than the coupling constants of the electron-nuclear Interaction. We also study, theoretically, the hole-Spin dephasing of an ensemble of quantum dots via the hyperfine Interaction in the framework of frozen fluctuations of the nuclear field, in the absence or in the presence of an applied magnetic field. We also discuss experiments which could evidence the dipole-dipole hyperfine Interaction and give information on hole mixing.
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Hole-Nuclear Spin Interaction in Quantum Dots
Physical Review Letters, 2009Co-Authors: Benoît Eble, Th Amand, Pascal Desfonds, Christophe Testelin, Andrea Balocchi, Xavier Marie, Audrey Miard, Aristide Lemaître, Frédéric Bernardot, Maria ChamarroAbstract:We have measured the carrier Spin dynamics in p-doped InAs/GaAs quantum dots by pump-probe and time-resolved photoluminescence experiments. We obtained experimental evidence of the hyperfine Interaction between hole and nuclear Spins. In the absence of an external magnetic field, our calculations based on dipole-dipole coupling between the hole and the quantum dot nuclei lead to a hole-Spin dephasing time for an ensemble of dots of 14 ns, in close agreement with experiments.
Frédéric Bernardot - One of the best experts on this subject based on the ideXlab platform.
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Hole-Spin dephasing time associated with hyperfine Interaction in quantum dots
Physical Review B : Condensed matter and materials physics, 2009Co-Authors: Christophe Testelin, Benoît Eble, Frédéric Bernardot, Maria ChamarroAbstract:The Spin Interaction of a hole confined in a quantum dot with the surrounding nuclei is described in terms of an effective magnetic field. We show that, in contrast to the Fermi contact hyperfine Interaction for conduction electrons, the dipole-dipole hyperfine Interaction is anisotropic for a hole, for both pure or mixed hole states. We evaluate the coupling constants of the hole-nuclear Interaction and demonstrate that they are only 1 order of magnitude smaller than the coupling constants of the electron-nuclear Interaction. We also study, theoretically, the hole-Spin dephasing of an ensemble of quantum dots via the hyperfine Interaction in the framework of frozen fluctuations of the nuclear field, in the absence or in the presence of an applied magnetic field. We also discuss experiments which could evidence the dipole-dipole hyperfine Interaction and give information on hole mixing.
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Hole-Nuclear Spin Interaction in Quantum Dots
Physical Review Letters, 2009Co-Authors: Benoît Eble, Th Amand, Pascal Desfonds, Christophe Testelin, Andrea Balocchi, Xavier Marie, Audrey Miard, Aristide Lemaître, Frédéric Bernardot, Maria ChamarroAbstract:We have measured the carrier Spin dynamics in p-doped InAs/GaAs quantum dots by pump-probe and time-resolved photoluminescence experiments. We obtained experimental evidence of the hyperfine Interaction between hole and nuclear Spins. In the absence of an external magnetic field, our calculations based on dipole-dipole coupling between the hole and the quantum dot nuclei lead to a hole-Spin dephasing time for an ensemble of dots of 14 ns, in close agreement with experiments.
Felix Ritort - One of the best experts on this subject based on the ideXlab platform.
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continuous phase transition in a Spin glass model without time reversal symmetry
Physical Review E, 1999Co-Authors: Giorgio Parisi, M Picco, Felix RitortAbstract:We investigate the phase transition in a strongly disordered short-range three-Spin Interaction model characterized by the absence of time-reversal symmetry in the Hamiltonian. In the mean-field limit the model is well described by the Adam-Gibbs-DiMarzio scenario for the glass transition; however, in the short-range case this picture turns out to be modified. The model presents a finite temperature continuous phase transition characterized by a divergent Spin-glass susceptibility and a negative specific-heat exponent. We expect the nature of the transition in this three-Spin model to be the same as the transition in the Edwards-Anderson model in a magnetic field, with the advantage that the strong crossover effects present in the latter case are absent. @S1063-651X~99!09806-2#
