Publication

Spin relaxation of negatively charged excitons in CdTe quantum wells

Benoît Marie Joseph Deveaud, Jean-Daniel Ganière, Victoria Ciulin
2002
Journal Articles

Résumé

We investigate the spin relaxation of negatively charged excitons in modulation-doped CdTe quantum wells by time-resolved photoluminescence. The charged exciton spin flip process is found to be very sensitive to the excitation energy but not to a change of electron concentration. We exclude the Bir-Aronov-Pikus mechanism, which is based on the exchange interaction, as responsible for the X- spin flip.

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https://infoscience.epfl.ch/entities/publication/0a5f7da1-8e3e-42bf-9133-cb33dd1734de

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Benoît Marie Joseph Deveaud, Jean-Daniel Ganière, Victoria Ciulin
2002
Journal Articles

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/0a5f7da1-8e3e-42bf-9133-cb33dd1734de

À propos de ce résultat

Concepts associés (23)

Spin echo

In magnetic resonance, a spin echo or Hahn echo is the refocusing of spin magnetisation by a pulse of resonant electromagnetic radiation. Modern nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) make use of this effect. The NMR signal observed following an initial excitation pulse decays with time due to both spin relaxation and any inhomogeneous effects which cause spins in the sample to precess at different rates. The first of these, relaxation, leads to an irreversible loss of magnetisation.

Spin–lattice relaxation

During nuclear magnetic resonance observations, spin–lattice relaxation is the mechanism by which the longitudinal component of the total nuclear magnetic moment vector (parallel to the constant magnetic field) exponentially relaxes from a higher energy, non-equilibrium state to thermodynamic equilibrium with its surroundings (the "lattice"). It is characterized by the spin–lattice relaxation time, a time constant known as T1.

Spin–spin relaxation

In physics, the spin–spin relaxation is the mechanism by which Mxy, the transverse component of the magnetization vector, exponentially decays towards its equilibrium value in nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI). It is characterized by the spin–spin relaxation time, known as T2, a time constant characterizing the signal decay. It is named in contrast to T1, the spin–lattice relaxation time.

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Publications associées (9)

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Spin relaxation of negatively charged excitons in CdTe quantum wells

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