Motion-dependent magnetic properties of excitons in CdTe

Smith, L. C.; Davies, J.; Wolverson, Daniel; Crampin, S.; Cox, R.T.; Cibert, J.; Mariette, H.; Кочерешко, В. П.; Wiater, M.; Karczewski, G.; Wójtowicz, T.

doi:10.1103/physrevb.78.085204

Cited by 25 publications

(35 citation statements)

References 25 publications

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“…6 is observed not only for QWs of varying widths but also for the excited exciton states in the QWs. We should note that monotonic dependence of the exciton g-factor on the effective wave vector has been observed previously only for the wide QWs [28][29][30]. …”

Section: Narrow Quantum Wellsmentioning

confidence: 99%

“…Similar technique has been used in several publications, see, e.g., Refs. [28,29,31,[37][38][39] resonantly using a Ti-sapphire or a He-Ne laser. Spectral resolution of the setup was sufficiently better than the typical width of features in the PL spectra.…”

Section: Methodsmentioning

confidence: 99%

“…Large variation of exciton g-factor for different quantum-confined exciton states has been experimentally observed in several heterostructures with wide QWs [27][28][29][30]. Effect of the quantum confinement of excitons in the QWs gives rise to quasiperiodic peculiarities in optical spectra corresponding to the quantization of the centerof-mass exciton motion [31,32].…”

Section: Introductionmentioning

confidence: 99%

“…This fact strongly simplifies theoretical analysis. The gfactor modification has been treated as the mixing of the relative motion of electron and hole in the exciton and the motion of the exciton as the whole [28,29].…”

Section: Introductionmentioning

confidence: 99%

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Inversion of Zeeman splitting of exciton states in InGaAs quantum wells

et al. 2016

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Zeeman splitting of the quantum confined states of excitons in the InGaAs quantum wells (QWs) is experimentally found to strongly depend on the quantization energy. Moreover, it changes its sign when the quantization energy increases with the decrease of the QW width. In the 87-nm QW, the sign change is observed for the excited quantum confined states, which are above the ground state only by a few meV. A two-step approach for the numerical solution of two-particle Schrödinger equation with taking into account for the Coulomb interaction and the valence-band coupling is used for theoretical justification of the observed phenomenon. The calculated variation of the g-factor convincingly follows the dependencies obtained in the experiments.

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Section: Narrow Quantum Wellsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Inversion of Zeeman splitting of exciton states in InGaAs quantum wells

et al. 2016

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“…2 It has also been observed that the Zeeman splitting and the diamagnetism properties of the excitons are functions of the exciton translational wave vector, which itself is a function of an external magnetic field applied in a specific direction. 3 Most importantly, both the excitons energy splitting and their effective masses are found to depend strongly on the magnitude of the external magnetic field and its direction. At high fields, the effective masses of the excitons become larger than the sum of the electron and hole masses.…”

Section: Introductionmentioning

confidence: 99%

Spatially resolved inhomogeneous depressions of the excitons Zeeman splitting in an integrated magnetic-multiple quantum wells system

Abdelrahman

Kang

Yim

et al. 2011

Journal of Applied Physics

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We report on the generation of a nonuniform spatial distribution of the heavy and light-hole excitons in a multiple quantum wells system integrated with a localized inhomogeneous weak magnetic field. An inhomogeneous spatially resolved depression of the Zeeman splittings of the heavy-hole excitons and the light-hole excitons with respect to their translational wave vectors is observed. A localized inverted concentration of the two types of the excitons due to the inhomogeneity of the magnetic field is also measured. A simple method to integrate permanent magnetic materials with the multiple quantum wells system is used to create an accessible degree of control for magnetically manipulating the excitonic distributions.

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Excitons in motion in II–VI semiconductors

Davies

Smith

Wolverson

et al. 2010

Physica Status Solidi (b)

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We have shown recently that the magnetic properties of excitons change significantly as the excitons acquire kinetic energy. In particular, the exciton magnetic moments are enhanced considerably, whilst the diamagnetism decreases. The behaviour can be investigated through spectroscopic studies of excitons confined in quantum wells of large width (greater than five times the exciton Bohr radius) and these motion-induced changes in the magnetic properties have now been observed for CdTe, ZnSe, ZnTe and GaAs. The present paper summarises these phenomena, with particular focus on CdTe and ZnSe, and shows that the changes can be accounted for by motion-induced mixing between the exciton ground and higher lying states. The mixing is caused by the g 3 term in the Luttinger Hamiltonian which describes the dispersion curves for the valence band and, as a result, the form of the exciton wavefunction becomes motion-dependent. For both materials, excellent agreement is obtained between experiment and the results predicted by this mechanism.ß 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim 1 Introduction What happens to excitons when they move through semiconductors? To answer this question is not easy, since the usual method of investigating the structure of excitons is to use optical spectroscopy and, unfortunately, the small wavevector of photons means that only excitons with low values of their translational wavevectors can conventionally be studied. To overcome this difficulty, we have in a series of recent investigations [1-6] studied excitons in potential wells which are sufficiently wide for quantum confinement energies to be smaller than the exciton binding energy. In such quantum wells, the exciton can be described in the adiabatic or centre of mass (CoM) approximation [7,8], in which it is considered as a composite particle formed from the electron and the hole mutually orbiting each other. The translational wavevector K z of the exciton as a whole is then quantised approximately according to K z ¼ np=L, where L is the width of the quantum well and N is a non-zero integer, and the recombination transition energies of the exciton then have discrete values. As a result of the loss in translational symmetry, photons can interact with excitons with large

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Motion-dependent magnetic properties of excitons in CdTe

Cited by 25 publications

References 25 publications

Inversion of Zeeman splitting of exciton states in InGaAs quantum wells

Inversion of Zeeman splitting of exciton states in InGaAs quantum wells

Spatially resolved inhomogeneous depressions of the excitons Zeeman splitting in an integrated magnetic-multiple quantum wells system

Excitons in motion in II–VI semiconductors

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