TY - JOUR
T1 - Confined and interface phonon scattering in finite barrier GaAs/AlGaAs quantum wires
AU - Jiang, W.
AU - Leburton, Jean-Pierre
PY - 1993
Y1 - 1993
N2 - We report on the calculation of the total scattering rate in finite barrier GaAs/AlGaAs quantum wires based on the interaction Hamiltonian of confined longitudinal optical (LO) phonon and surface (SO) phonon modes. With multisubband processes being properly taken into account, our calculation indicates that for GaAs type of phonons the high-frequency symmetric (s+) branch plays an important role among all the other SO phonon branches; it can even dominate over confined LO phonons in highly confined quantum wires as observed by K. W. Kim, M. A. Stroscio, A. Bhatt, R. Mickevicius, and V. V. Mitin [J. Appl. Phys. 70, 319 (1991)]. Our results also demonstrate that the total contributions of confined LO and SO phonon scattering resemble closely to GaAs bulk LO phonon scattering. Selection rules between intersubband transitions for SO modes suggest the possibility of a bottle-neck effect for carrier relaxation in square wires compared with rectangular wires.
AB - We report on the calculation of the total scattering rate in finite barrier GaAs/AlGaAs quantum wires based on the interaction Hamiltonian of confined longitudinal optical (LO) phonon and surface (SO) phonon modes. With multisubband processes being properly taken into account, our calculation indicates that for GaAs type of phonons the high-frequency symmetric (s+) branch plays an important role among all the other SO phonon branches; it can even dominate over confined LO phonons in highly confined quantum wires as observed by K. W. Kim, M. A. Stroscio, A. Bhatt, R. Mickevicius, and V. V. Mitin [J. Appl. Phys. 70, 319 (1991)]. Our results also demonstrate that the total contributions of confined LO and SO phonon scattering resemble closely to GaAs bulk LO phonon scattering. Selection rules between intersubband transitions for SO modes suggest the possibility of a bottle-neck effect for carrier relaxation in square wires compared with rectangular wires.
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U2 - 10.1063/1.354816
DO - 10.1063/1.354816
M3 - Article
AN - SCOPUS:0012959872
VL - 74
SP - 1652
EP - 1659
JO - Journal of Applied Physics
JF - Journal of Applied Physics
SN - 0021-8979
IS - 3
ER -