Subband separation energy dependence of intersubband relaxation time in wide quantum wells

Subband separation energy dependence of intersubband relaxation time in a wide quantum well (250 A) was studied by steady-state and time-resolved photoluminescence. By applying a perpendicular electrical field, the subband separation energy in the quantum well is continuously tuned from 21 to 40 meV. As a result, it is found that the intersubband relaxation time undergoes a drastic change from several hundred picoseconds to subpicoseconds. It is also found that the intersubband relaxation has already become very fast before the energy separation really reaches one optical phonon energy.

[1]  Hou-zhi Zheng,et al.  Photoluminescence Investigation of Charge Build-Up Process in the Emitter of a Double-Barrier Resonant Tunneling Structure , 1996 .

[2]  Arthur C. Gossard,et al.  Far‐infrared pump‐probe measurements of the intersubband lifetime in an AlGaAs/GaAs coupled‐quantum well , 1996 .

[3]  Lee,et al.  Influence of electron temperature and carrier concentration on electron-LO-phonon intersubband scattering in wide GaAs/AlxGa1-xAs quantum wells. , 1995, Physical review. B, Condensed matter.

[4]  B. Deveaud,et al.  Ultrafast dynamics of intersubband relaxation in GaAs quantum wells: hot carrier and phonon populations effects , 1994 .

[5]  G. W. Smith,et al.  Optical spectroscopy of inverted electron populations in double-barrier resonant-tunnelling structures , 1994 .

[6]  Hou-zhi Zheng,et al.  Studies on tunneling escape time of electrons from a quantum well in multilayered heterostructures , 1994 .

[7]  K. Klitzing,et al.  Photoluminescence spectroscopy of hot carriers in superlattices injected by resonant tunnelling , 1992 .

[8]  Abram,et al.  Intersubband carrier relaxation in highly excited GaAs/Ga1-xAlxAs multiple quantum wells. , 1990, Physical review. B, Condensed matter.

[9]  Ryan,et al.  Time-resolved Raman measurements of intersubband relaxation in GaAs quantum wells. , 1989, Physical review letters.

[10]  Ferreira,et al.  Evaluation of some scattering times for electrons in unbiased and biased single- and multiple-quantum-well structures. , 1989, Physical review. B, Condensed matter.

[11]  Klein,et al.  Time-resolved Raman scattering in GaAs quantum wells. , 1987, Physical review letters.