Resonant phonon scattering of paraexcitons in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Cu</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:mtext>O</mml:mtext></mml:mrow></mml:math>

Sandfort, Christian; Brandt, J.; Fröhlich, D.; Bayer, М.; Stolz, H.

doi:10.1103/physrevb.78.045201

Cited by 12 publications

(5 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…8. Two-phonon assisted luminescence is present in the decay of cuprous oxide paraexcitons in high magnetic fields [39]. Two phonon transitions are also known in silicon [40] and graphene [41].…”

Section: 95 Ev Luminescencementioning

confidence: 99%

Evaluation of defects in cuprous oxide through exciton luminescence imaging

Frazer

Lenferink

Chang

et al. 2015

Journal of Luminescence

View full text Add to dashboard Cite

The various decay mechanisms of excitons in cuprous oxide (Cu 2 O) are highly sensitive to defects which can relax selection rules. Here we report cryogenic hyperspectral imaging of exciton luminescence from cuprous oxide crystals grown via the floating zone method showing the samples have few defects. Some locations, however, show strain splitting of the 1s orthoexciton triplet polariton luminescence. Strain is reduced by annealing. In addition, annealing causes annihilation of oxygen and copper vacancies, which leads to a negative correlation between luminescence of unlike vacancies.

show abstract

Section: 95 Ev Luminescencementioning

confidence: 99%

Evaluation of defects in cuprous oxide through exciton luminescence imaging

Frazer

Lenferink

Chang

et al. 2015

Journal of Luminescence

View full text Add to dashboard Cite

show abstract

“…In addition, these authors observed a surprisingly narrow para-exciton magneto-absorption line. 27,28 .…”

Section: Introductionmentioning

confidence: 99%

“…More recently, the optically forbidden paraexcitons were observed in fields up to 10 T. This work used resonant excitation to create an initially cold paraexciton gas and found a surprisingly narrow paraexciton magnetoabsorption line. 30,31 In this paper we show that the application of sufficiently high magnetic fields is a noninvasive and subtle tool to activate both the direct and phonon-assisted emissions of the initially dark paraexcitons in Cu 2 O. The observation of phonon-assisted emission provides a direct tool to probe the thermodynamical properties of paraexcitons gas in Cu 2 O, and eventually, the appearance of its possible condensate phase.…”

Section: Introductionmentioning

confidence: 99%

Magneto-optical readout of dark exciton distribution in cuprous oxide

et al. 2009

View full text Add to dashboard Cite

Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. An experimental study of the yellow exciton series in Cu 2 O in strong magnetic fields up to 32 T shows the optical activation of direct and phonon-assisted paraexciton luminescence due to mixing with the quadruple allowed orthoexciton state. The observed phonon-assisted luminescence yields information on the statistical distribution of occupied states. Additional time-resolved experiments provide a unique opportunity to directly determine the time evolution of the thermodynamical properties of the paraexciton gas. Because the lifetime of paraexciton is hardly affected by the optical activation in a strong magnetic field, this opens new possibilities for studies aiming at Bose-Einstein condensation of excitons in bulk semiconductors.

show abstract

“…The phonon assisted emission via ⌫ 5 − and ⌫ 3 − optical phonons is monitored by a camera behind a double monochromator with a resolution of 10 eV. 13 The additional shift of the Brillouin resonances due to the optical phonons ͑10.58 meV for ⌫ 5 − phonons, 13.45 meV for ⌫ 3 − phonons͒ and the use of optical low pass filters allows an excellent supression of scattered laser light.…”

Section: Setupmentioning

confidence: 99%

Resonant stimulated Brillouin scattering of orthoexcitons inCu2O

et al. 2009

Self Cite

View full text Add to dashboard Cite

Resonant excitation of 1S orthoexcitons in Cu 2 O in a magnetic field leads to a fine structure in the ⌫ 3 − and ⌫ 5 − optical phonon assisted emission. This fine structure can be attributed to intraband and interband resonant Brillouin scattering. For increasing power a strong nonlinear enhancement of the intensity of this fine structure and a splitting due to preferential scattering into forward/backward direction is observed, indicating a stimulation of the scattering processes. We present a detailed analysis of the kinematics of the transversal/ longitudinal acoustic ͑TA/LA͒ phonon scattering processes. The exclusive observation of slow TA interband scattering and LA intraband scattering is deduced from selection rules for acoustic phonon scattering and the deformation potentials. Furthermore, a strong asymmetric resonance dependence is observed.

show abstract

Resonant phonon scattering of paraexcitons inCu2O

Cited by 12 publications

References 15 publications

Evaluation of defects in cuprous oxide through exciton luminescence imaging

Evaluation of defects in cuprous oxide through exciton luminescence imaging

Magneto-optical readout of dark exciton distribution in cuprous oxide

Resonant stimulated Brillouin scattering of orthoexcitons inCu2O

Contact Info

Product

Resources

About