DOI QR코드

DOI QR Code

Dynamics and Bleaching of Ground State in CdSe/ZnS Quantum Dots

  • Kim, J.H. (Department of Physics, Pusan National University) ;
  • Kyhm, K. (Department of Physics, Pusan National University)
  • 투고 : 2006.11.20
  • 발행 : 2006.12.25

초록

For resonant excitation of the ground state $1s^e-1S^h_{3/2}$, dynamics of 'the electron-hole pair in a CdSe quantum dot was investigated by degenerate pump-probe measurement. At low e-h pair densities, the decay of $1s^e-1S^h_{3/2}$ state is dominated by radiative recombination. As the number of the electron-hole pairs increases, new decay features become significant. Theoretical comparison suggests this is attributed to the bi-molecular and Auger-type scattering.

키워드

참고문헌

  1. L. Pavesi et al., 'Optical gain in silicon nanocrystals', Nature, vol. 408, pp. 440-444 (2000) https://doi.org/10.1038/35044012
  2. V. I. Klimov et al., 'Optical gain and stimulated emission in nanocrystal quantum dots', Science, vol. 290, pp. 314-317 (2000) https://doi.org/10.1126/science.290.5490.314
  3. Jung-Chul Seo et al., 'Intensity-dependent dynamics of photoinduced absorption in CdSSe semiconductor doped glass', Journal of the Optical Society of Korea, vol. 1, pp. 15-18 (1997) https://doi.org/10.3807/JOSK.1997.1.1.015
  4. V. I. Klimov et al., 'Quantization of multiparticle auger rates in semiconductor quantum dots', Science, vol. 287, pp. 1011-1013 (2000) https://doi.org/10.1126/science.287.5455.1011
  5. U. Bockelmann et al., 'Phonon scattering and energy relaxation in two-, one-, and zero-dimensional electron gases', Phys. Rev., vol. B42, pp. 8947-8951 (1990) https://doi.org/10.1103/PhysRevB.42.8947
  6. V. I. Klimov et al., 'Femtosecond 1P-to-1S electronrelaxation in strongly confined semiconductor nanocrystals', Phys. Rev. Lett., vol. 80, pp. 4028-4031 (1998) https://doi.org/10.1103/PhysRevLett.80.4028
  7. P. Nemec et al., 'Auger recombination as a probe of the Mott transition in semiconductor nanocrystals', Applied Phys. Lett., vol. 76, pp. 2850-2852 (2000) https://doi.org/10.1063/1.126494
  8. N. Peyghambarian et al., 'Femtosecond optical nonlinearities of CdSe quantum dots', IEEE J. Quantum EIectronics, vol. 25, pp. 2516-2522 (1989) https://doi.org/10.1109/3.40636
  9. K. Kayanuma et at., 'Wannier exciton in microcrystals', Solid State Comm., vol. 59, pp. 405-408 (1986) https://doi.org/10.1016/0038-1098(86)90573-9
  10. A. A. Mikhailovsky et al., 'Multiparticle interactions and stimulated emission in chemically synthesized quantum dots', Applied Phys. Lett., vol. 80, pp. 2380-2382 (2002) https://doi.org/10.1063/1.1463704
  11. P. Borri et al., 'Rabi oscillations in the excitonic ground-state transition of InGaAs quantum dots', Phys. Rev., vol. B66, 081306 (1-4) (2002) https://doi.org/10.1103/PhysRevB.66.081306
  12. T. Stauber et al., 'Optical absorption in quantum dots: Coupling to longitudinal optical phonons treated exactly', Phys. Rev., vol. B73, 115303 (1-10) (2006) https://doi.org/10.1103/PhysRevB.73.115303