Determination of the sign of the conduction-electron g factor in semiconductor quantum wells by means of the Hanle effect and spin-quantum-beat techniques

Kalevich, V. K.; Zakharchenya, B. P.; Kavokin, K. V.; Petrov, A. D.; Jeune, P. Le; Marie, X.; Robart, D.; Amand, T.; Barrau, J.; Brousseau, M.

doi:10.1134/1.1129913

Cited by 21 publications

(16 citation statements)

References 4 publications

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“…The projection of the electron spin onto the direction of observation oscillates in time with the Larmor frequency ω L = g μ B H /ℏ [ 18 ], where μ B is the Bohr magneton, g is the electron- g factor and ℏ is the reduced Planck constant. The P PL should oscillate between +1 (100%) and −1 with the same frequency [ 19 ] because, when the hole spin has no preferential orientation, this quantity is determined only by the projection of the electron spin.…”

Section: Resultsmentioning

confidence: 99%

Photo-Induced Spin Dynamics in Semiconductor Quantum Wells

Miah

2009

Nanoscale Res Lett

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We experimentally investigate the dynamics of spins in GaAs quantum wells under applied electric bias by photoluminescence (PL) measurements excited with circularly polarized light. The bias-dependent circular polarization of PL (PPL) with and without magnetic field is studied. ThePPLwithout magnetic field is found to be decayed with an enhancement of increasing the strength of the negative bias. However,PPLin a transverse magnetic field shows oscillations under an electric bias, indicating that the precession of electron spin occurs in quantum wells. The results are discussed based on the electron–hole exchange interaction in the electric field.

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Section: Resultsmentioning

confidence: 99%

Photo-Induced Spin Dynamics in Semiconductor Quantum Wells

Miah

2009

Nanoscale Res Lett

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“…The basis of this method was developed in the PL spectroscopy. 24,25 Here we apply it to the TRKR measurements. Figure 10͑a͒ shows the configuration of the sample, magnetic field direction, and light beams in our experiment.…”

Section: Spin Orientation Under Oblique-incidence Optical Pumpingmentioning

confidence: 99%

Anisotropic spin dynamics of confined electrons in CdTe/ZnTe quantum structures

et al. 2010

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We have studied the spin dynamics of confined electrons in an ultrathin CdTe/ZnTe quantum well and self-assembled quantum dots by time-resolved Kerr-rotation technique. The dependence of the spin-precession frequency on the magnetic field direction shows the anisotropy of the g-factor tensor, which is the opposite of the usual quantum wells with moderate widths. The geometrical anisotropy of the confinement also affects the initial orientation of the electron spins created optically, as revealed clearly with the use of oblique-incidence pump pulses.

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“…However, several approaches have been developped to determine the sign of a scalar g factor experimentally using (time-resolved) luminescence-based techniques. [84][85][86] More recently, approaches based on TRKR and variations thereof were demonstrated which could be applied to our sample structures. Yang et al used non-collinear pump and probe-pulses in a TRKR setup to determine the sign of the g factor, 87 while Kosaka et al applied a tomographic Kerr rotation (TKR) method to trace the time evolution of spins in all three dimensions.…”

Section: Discussionmentioning

confidence: 99%

Asymmetric g Tensor in Low-Symmetry Two-Dimensional Hole Systems

Gradl¹,

Winkler²,

Kempf³

et al. 2018

Phys. Rev. X

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The complex structure of the valence band in many semiconductors leads to multifaceted and unusual properties for spin-3/2 hole systems compared to common spin-1/2 electron systems. In particular, two-dimensional hole systems show a highly anisotropic Zeeman interaction. We have investigated this anisotropy in GaAs/AlAs quantum well structures both experimentally and theoretically. By performing time-resolved Kerr rotation measurements, we found a non-diagonal tensor g that manifests itself in unusual precessional motion as well as distinct dependencies of hole spin dynamics on the direction of the magnetic field B. We quantify the individual components of the tensor g for [113]-, [111]-and [110]-grown samples. We complement the experiments by a comprehensive theoretical study of Zeeman coupling in in-plane and out-of-plane fields B. To this end, we develop a detailed multiband theory for the tensor g. Using perturbation theory, we derive transparent analytical expressions for the components of the tensor g that we complement with accurate numerical calculations based on our theoretical framework. We obtain very good agreement between experiment and theory. Our study demonstrates that the tensor g is neither symmetric nor antisymmetric. Opposite off-diagonal components can differ in size by up to an order of magnitude. The tensor g encodes not only the Zeeman energy splitting but also the direction of the axis about which the spins precess in the external field B. In general, this axis is not aligned with B. Hence our study extends the general concept of optical orientation to the regime of nontrivial Zeeman coupling.

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Determination of the sign of the conduction-electron g factor in semiconductor quantum wells by means of the Hanle effect and spin-quantum-beat techniques

Cited by 21 publications

References 4 publications

Photo-Induced Spin Dynamics in Semiconductor Quantum Wells

Photo-Induced Spin Dynamics in Semiconductor Quantum Wells

Anisotropic spin dynamics of confined electrons in CdTe/ZnTe quantum structures

Asymmetric g Tensor in Low-Symmetry Two-Dimensional Hole Systems

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