Exciton states in two-dimensional systems of GaAs/AlAs multi-quantum-well structures under high magnetic fields

Yasui, Takanari; Segawa, Y.; Aoyagi, Yoshinobu; Iimura, Yasufumi; Bauer, G.; Mogi, Iwao; Kido, G.

doi:10.1103/physrevb.51.9813

Cited by 9 publications

(7 citation statements)

References 29 publications

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“…Normally, the oscillator strength of a transition with even transition index ⌬n should be higher than that of a transition with odd ⌬n. At Bϭ0, the intensity of hh 13 is higher than that of hh 12 and the intensity of 1shh 22 is higher than that of 1hh 21 .…”

Section: Hh 21 and 1lh Exciton Propertiesmentioning

confidence: 94%

Magneto-optical study of excitonic states inIn0.045Ga0.955As/
Wang
¹
,
Bayer
²
,
Forchel
³

et al. 2000
Phys. Rev. B
5
0
3
0
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The excitonic states have been investigated in In 0.045 Ga 0.955 As/GaAs heterostructures consisting of i quantum wells (iϭ1,2,3,4) with 7.5 nm well thickness. For a 2.5 nm barrier thickness between the wells, the electronic states are strongly coupled. Because of the coupling, the heavy-hole exciton nshh of each single quantum well is split into i 2 states. The states can be characterized according to their symmetry under a combination of the reflections of the single particles at the quantum-well plane. The energy order of the symmetric and antisymmetric states as a function of quantum-well number is investigated in detail, and compares well to the theoretical calculation. These coupled quantum-well structures exhibit somewhat three-dimensional character based on the study of their exciton binding energies and wave functions. Highly resolved photoluminescence excitation spectra are presented, measured in magnetic fields up to 13 T using circularly polarized light. Strong mixing between light-and heavy-hole excitons causes optical transitions into high-angular-momentum exciton states and strong anticrossing effects. An anticrossing between the 3dhh 11 and hh 21 exciton is observed. Also, the light-hole exciton is found to possess ⌫ 7g and ⌫ 6g symmetries.

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Section: Hh 21 and 1lh Exciton Propertiesmentioning

confidence: 94%

Magneto-optical study of excitonic states inIn0.045Ga0.955As/
Wang
¹
,
Bayer
²
,
Forchel
³

et al. 2000
Phys. Rev. B
5
0
3
0
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“…The exact eigenvalues of the Hamiltonian including magnetic field, band mixing effects, and Coulomb interaction are very difficult to obtain, and different approximations have been considered, depending on the characteristics of the system under study and the relative importance of the magnetic field and Coulomb effects. 16,[21][22][23] We will take into account the confinement of the excitonic movement along the quantum well direction and neglect the z dependence of the Coulomb potential, writing…”

Section: B Eigenstates: Effect Of Coulomb Interactionmentioning

confidence: 99%

Role of excitons in double Raman resonances in GaAs quantum wells

et al. 1996

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Raman scattering by longitudinal-optical phonons has been measured in GaAs-AlAs multiple quantum wells at high magnetic fields. Doubly resonant scattering processes are observed at photon energies corresponding to magneto-excitons with different principal quantum numbers for the incoming and outgoing channels. The existence of these initially forbidden scattering processes, their resonance energies, and their relative intensities are correctly reproduced by our theoretical description. The model takes into account the excitonic nature of the intermediate states, as well as scattering processes involving a nonzero in-plane phonon wave vector, which is required to allow inter-Landau level scattering of the exciton.

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“…It has been found that the exciton g-factor strongly depends on the QW width [11-15, 18, 19] and on the magnetic field magnitude when it exceeds several Teslas [10,16,19,21,22]. In particular, the inversion of the exciton g-factor measured in small magnetic fields has been reported in Refs.…”

Section: Introductionmentioning

confidence: 97%

“…Such a form duplicates the structure of expressions (20,21,22,23) therefore it is easy to match linear operators here with those introduced above.…”

Section: Appendix: Non-diagonal Operators Of Luttingermentioning

confidence: 99%

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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Exciton states in two-dimensional systems of GaAs/AlAs multi-quantum-well structures under high magnetic fields

Cited by 9 publications

References 29 publications

Magneto-optical study of excitonic states inIn0.045Ga0.955As/
Wang
¹
,
Bayer
²
,
Forchel
³

et al. 2000
Phys. Rev. B
5
0
3
0
View full text Add to dashboard Cite

Magneto-optical study of excitonic states inIn0.045Ga0.955As/
Wang
¹
,
Bayer
²
,
Forchel
³

et al. 2000
Phys. Rev. B
5
0
3
0
View full text Add to dashboard Cite

Role of excitons in double Raman resonances in GaAs quantum wells

Inversion of Zeeman splitting of exciton states in InGaAs quantum wells

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Exciton states in two-dimensional systems of GaAs/AlAs multi-quantum-well structures under high magnetic fields

Cited by 9 publications

References 29 publications

Magneto-optical study of excitonic states inIn0.045Ga0.955As/Wang1, Bayer2, Forchel3 et al. 2000Phys. Rev. B5030View full textAdd to dashboardCite

Magneto-optical study of excitonic states inIn0.045Ga0.955As/Wang1, Bayer2, Forchel3 et al. 2000Phys. Rev. B5030View full textAdd to dashboardCite

Role of excitons in double Raman resonances in GaAs quantum wells

Inversion of Zeeman splitting of exciton states in InGaAs quantum wells

Contact Info

Product

Resources

About

Magneto-optical study of excitonic states inIn0.045Ga0.955As/
Wang
¹
,
Bayer
²
,
Forchel
³

et al. 2000
Phys. Rev. B
5
0
3
0
View full text Add to dashboard Cite

Magneto-optical study of excitonic states inIn0.045Ga0.955As/
Wang
¹
,
Bayer
²
,
Forchel
³

et al. 2000
Phys. Rev. B
5
0
3
0
View full text Add to dashboard Cite