The dispersion of excitons, polaritons and biexcitons in direct-gap semiconductors

Hönerlage, B.; Lévy, R.; Grün, J. B.; Klingshirn, C.; Bohnert, K.

doi:10.1016/0370-1573(85)90025-0

Cited by 259 publications

(88 citation statements)

References 268 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results lead us to conclude consistently that VB-ordering is C 9 À C 7 À C 7 in order of decreasing electron energy in the present strain-free ZnO, which is similar to the wz families such as CdS (Ref. 36) and GaN (Refs. 43 and 44).…”

Section: Introductionsupporting

confidence: 84%

“…36 Here, C 1 on the left side of the equations is the representation for the envelope function of an exciton ground state. The excitons of C 5 -and C 1 -symmetry are dipole-allowed and called as bright excitons.…”

Section: Introductionmentioning

confidence: 99%

“…Since the irreducible representation of the conduction band is C 7 , possible representations for the A-exciton ground states are C 1 C 7 C 7 ¼ C 1 È C 2 È C 5 in the case of C 7 -symmetry, while C 1 C 9 C 7 ¼ C 5 È C 6 for C 9 -symmetry. 36 The excitons of C 5 -and C 1 -symmetry are dipole-allowed and called as bright excitons. Conversely, excitons of C 6 -and C 2 -symmetry are optically inactive and called as dark excitons.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Valence-band-ordering of a strain-free bulk ZnO single crystal identified by four-wave-mixing spectroscopy technique

Hazu

Chichibu

Adachi

et al. 2012

Journal of Applied Physics

View full text Add to dashboard Cite

Depolarization effect on optical control of exciton states confined in GaAs thin films J. Appl. Phys. 110, 043514 (2011) Theoretical and experimental studies of surface plasmons excited at metal-uniaxial dielectric interface Appl. Phys. Lett. 98, 021113 (2011) Lateral spatial switching of excitons using vertical electric fields in semiconductor quantum rings Appl. Phys. Lett. 97, 173101 (2010) Enhanced exciton photoluminescence in the selectively Si-doped GaAs/AlxGa1−xAs heterostructures J. Appl. Phys. 108, 063522 (2010) Effect of correlation of local fluctuations on exciton coherence J. Chem. Phys. 132, 204503 (2010) Additional information on J. Appl. Phys. Spectroscopic and temporal four-wave-mixing (FWM) measurements are carried out on a strain-free bulk ZnO single crystal, in order to clarify the valence-band-ordering. Under the collinearly polarized lights with the electric-field component parallel to the c-axis, which can excite dipole-allowed C 1 -excitons, the FWM signal appears only in the energies corresponding to the B-exciton. Under the cross-linear polarization configuration exciting both C 5 -and C 1 -excitons, the FWM signal arising from the two-photon-coherence is absent in the energies corresponding to A-exciton. Both the results indicate that C 1 -exciton state belongs exclusively to B-exciton, meaning that the valence-band ordering is C 9 À C 7 À C 7 in order of decreasing electron energy for the present strain-free ZnO single crystal. V C 2012 American Institute of Physics.[http://dx

show abstract

Section: Introductionsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Valence-band-ordering of a strain-free bulk ZnO single crystal identified by four-wave-mixing spectroscopy technique

Hazu

Chichibu

Adachi

et al. 2012

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…The higher energetic peak can be attributed to the exciton-related transition by comparison with the corresponding absorption spectrum as mentioned in the section above. For larger dot sizes the measured energetic positions of this peak converges to the values of the transversal exciton energy observed in CuBr [2,3]. Similarly, the position of the lower energetic peak approaches the biexciton energy of the bulk material.…”

Section: Steady-state Luminescencesupporting

confidence: 70%

Luminescence of biexcitons in CuBr quantum dots

Wind

Woggon

Gogolin

et al. 1993

Le Journal de Physique IV

Self Cite

View full text Add to dashboard Cite

“…Similar processes have been previously termed hyper-Raman scattering in studying bulk polaritons using MW cm Ϫ2 pulses. 17 Additional emission is clearly resolved in the vicinity of the pump beam. Pair scattering is also responsible for this symmetric broadening and for the two correlated broad shoulders observed at 0°and 35°w hich correspond to the optimum phase matching condition.…”

Section: Rapid Communicationsmentioning

confidence: 97%

Asymmetric angular emission in semiconductor microcavities

et al. 2000

View full text Add to dashboard Cite

Strongly angular-dependent emission properties are observed from a semiconductor microcavity pumped along a critical angle of incidence. In contrast to the luminescence from conventional semiconductor heterostructures, the emission is completely asymmetrical with respect to the sample normal. The results imply that parametric scattering dominates the energy relaxation of polaritons, and is enhanced by the deformed shape of the dispersion relations.Planar semiconductor microcavities are of considerable interest because they can be used to modify and enhance optical emission from embedded semiconductor heterostructures. Highly controlled light output from microcavity lightemitting diodes ͑LEDs͒ and vertical cavity surface emitting lasers ͑VCSELs͒ is of practical application, 1 while organic microcavities have also successfully supported laser operation.2 When cooled sufficiently, optimally designed semiconductor microcavities enter a regime of strong coupling in which the exciton resonance mixes sufficiently with the cavity photon mode to form two new polariton modes. 3 Recent publications highlight the nonlinear power dependence of the luminescence from such samples and have controversially attributed it to stimulated scattering. [4][5][6][7] However under nonresonant pumping, light from these heterostructures, as from bare quantum wells, remains symmetrically distributed about the normal to the sample.In this paper, we comprehensively characterize both spectrally and angularly, the emission of light from microcavity samples which are resonantly pumped at a critical angle. In this regime strong angular asymmetries are seen in the photoluminescence, produced by parametric scattering between pairs of polaritons with different in-plane momentum and energy. Strong nonlinearities in the emission are produced when this scattering is stimulated by occupation of the final polariton state. By simultaneously injecting a pulse of light incident normally, the parametric scattering is externally stimulated and the two final states clearly observed.Angular measurements on these microcavity polaritons provide crucial information because they probe the whole range of exciton-photon interactions, starting from 0°where the coupling is strong and reaching Ϯ55°where the two modes are effectively not coupled. 8 Our experimental geometry concentrates on resonant pulsed excitation at the point of inflection of the lower polariton dispersion (k ʈ ϭ2.1ϫ10 6 m Ϫ1 ), while detecting the time-integrated luminescence emerging at different angles ͑Fig. 1͒. When the exciton and photon modes are degenerate at ϭ0°( ex ϭ cav ), this pump configuration generates parametric scattering shown by arrows in Fig. 2͑a͒, in which pump polariton pairs at ( p ,k p ) end up at both ( p Ϯ⑀,kϮq).9 To demonstrate the strong sensitivity of this scattering rate to the final state population, a normally incident probe pulse can be set to arrive simultaneously with the pump pulse. In order to inject polaritons at specific (,k), the optical pulses are spectrally fil...

show abstract

The dispersion of excitons, polaritons and biexcitons in direct-gap semiconductors

Cited by 259 publications

References 268 publications

Valence-band-ordering of a strain-free bulk ZnO single crystal identified by four-wave-mixing spectroscopy technique

Valence-band-ordering of a strain-free bulk ZnO single crystal identified by four-wave-mixing spectroscopy technique

Luminescence of biexcitons in CuBr quantum dots

Asymmetric angular emission in semiconductor microcavities

Contact Info

Product

Resources

About