Influence of femtosecond superradiant pulses on spontaneous emission spectra of GaAs/AlGaAs heterostructures

Vasil'ev, Petr P; Kan, Hirofumi; Hiruma, Teruo

doi:10.1070/qe2007v037n11abeh013542

Cited by 1 publication

(3 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It seems obvious that if one removes rapidly a large number of the 'coldest' electrons and holes from a system, then the rest of the carriers remain overheated for some time. This dynamic overheating of the electrons and holes can be found by analysing their spontaneous emission [38]. Indeed, the electron (hole) Fermi distribution depends on temperature, being broader at higher temperatures.…”

Section: Dynamic Overheating Of the E-h Systemmentioning

confidence: 99%

“…The longer pulses provide a large enough e-h density for the generation of the SR pulses [25]. When the duration of the current pulses is slightly less, the e-h density does not achieve the required value, and the SR pulses do not have enough time to form [38]. Figure 14 shows that the spectrum for the spontaneous emission in the case of the generation of superradiant pulse is slightly broader and is shifted towards longer wavelengths compared with the spectrum without the generation of the pulse.…”

Section: Dynamic Overheating Of the E-h Systemmentioning

confidence: 99%

“…Figure15. FWHM of the spectrum of the amplified spontaneous emission just before (dashed line) and after (solid line) the generation of the superradiant pulse[38].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Femtosecond superradiant emission in inorganic semiconductors

Vasil'ev

2009

Rep. Prog. Phys.

View full text Add to dashboard Cite

A review of an experimental study of superradiance in semiconductor inorganic structures is presented. It is demonstrated that unique properties of superradiant emission are determined by unusual properties of electrons and holes, namely, the formation of BCS-like state in a system of collectively paired electrons and holes. This can adequately explain all features of superradiance, including its femtosecond pulse duration, record peak power, optical spectrum, spatial and temporal coherency and macroscopically large fluctuations. The effect of non-equilibrium condensation of electrons and holes in the phase domain at room temperature is experimentally demonstrated. The critical temperature of condensation in a strongly degenerate system of electrons and holes is finally theoretically estimated. 4.8. Non-equilibrium condensation of the electrons and holes 12 5. Hypothesis: quasi-stable BCS-like electron-hole state 13 6. Mechanism of metastability of the quasi-equilibrium collective state 14 7. Optical spectra fitting. Parameters of the coherent state 16 8. Mechanism of the formation of the condensate 17 9. Low energy level of the collectively paired e-h pairs 17 10. Critical temperature of condensation in highly degenerate e-h system in the presence of resonant electromagnetic field 18 11. SR of excitonic condensates 20 12. Conclusions 20 Acknowledgment 21 References 22

show abstract

Section: Dynamic Overheating Of the E-h Systemmentioning

confidence: 99%

Section: Dynamic Overheating Of the E-h Systemmentioning

confidence: 99%