Valence‐band mixing effects on exciton dipole terahertz emission from asymmetric triple quantum wells

We analyze the influence of band mixing on the dynamics of hole tunneling in asymmetric GaAs–Ga1−xAlxAs triple quantum wells. A combination of the time‐dependent Schrodinger equation and the Luttinger Hamiltonian is used to calculate the terahertz radiation from excitons. When the electric field required for resonance of electrons between the central and right well coincides with the field needed for hole resonance between the central and left well the radiation is strongly increased. If this field coincides with the hole mixing field at k∥≠0, a new modulation of the dipole emission appears, being drastically affected in frequency and amplitude. The calculated effect is greater than previous results for asymmetric double quantum wells.

[1]  Raichev Oe,et al.  Charge oscillations in double quantum wells: Nonlinear effects caused by the Coulomb interaction. , 1995 .

[2]  Binder,et al.  Coherent intraband and interband dynamics in double quantum wells: Exciton and free-carrier effects. , 1994, Physical review. B, Condensed matter.

[3]  L. Tsang,et al.  Coherent terahertz emission from coupled quantum wells with exciton effects , 1994 .

[4]  Cruz,et al.  Possiblity of terahertz emission with a time-dependent amplitude in semiconductor quantum wells. , 1994, Physical review. B, Condensed matter.

[5]  H. Roskos,et al.  Terahertz electromagnetic radiation from quantum wells , 1994 .

[6]  Luo,et al.  Coherent double-pulse control of quantum beats in a coupled quantum well. , 1993, Physical review. B, Condensed matter.

[7]  Luo,et al.  Coherent control of terahertz charge oscillations in a coupled quantum well using phase-locked optical pulses. , 1993, Physical review. B, Condensed matter.

[8]  Zimmermann,et al.  Interface excitons in staggered-line-up quantum wells: The AlAs/GaAs case. , 1993, Physical review. B, Condensed matter.

[9]  Andrew M. Weiner,et al.  Repetitive excitation of charge oscillations in semiconductor heterostructures , 1993 .

[10]  Luban,et al.  Semiconductor superlattices as terahertz generators. , 1993, Physical review. B, Condensed matter.

[11]  Juang,et al.  Valence-band mixing effects on hole oscillations in coupled quantum wells. , 1993, Physical review. B, Condensed matter.

[12]  Luo,et al.  Terahertz emission in single quantum wells after coherent optical excitation of light hole and heavy hole excitons. , 1992, Physical review letters.

[13]  Fox,et al.  Coherent submillimeter-wave emission from charge oscillations in a double-well potential. , 1992, Physical review letters.

[14]  Alfano,et al.  Excitonic effects on coherent oscillations of a photoexcited wave packet in double quantum wells. , 1992, Physical review. B, Condensed matter.

[15]  P. Aceituno,et al.  Valence band dispersion in finite quantum wells with uniform electric field , 1988 .

[16]  G. Bastard.  Hydrogenic impurity states in a quantum well: A simple model , 1981 .

[17]  Judah L. Schwartz,et al.  Computer-Generated Motion Pictures of One-Dimensional Quantum-Mechanical Transmission and Reflection Phenomena , 1967 .