DEPENDENCE OF EXCITON FORMATION ON ITS CENTER-OF-MASS MOMENTUM IN QUANTUM WELLS

We present a comprehensive study of the process of exciton formation due to exciton-phonon interaction. Using the exciton-phonon interaction arising from deformation potential, piezoelectric, and polar couplings, we have calculated the rate of formation of an exciton as a function of carrier densitiies, temperatures, and center-of-mass momentum ( K ‖) in quantum wells. Our results show that excitons are dominantly formed at non-zero K ‖, which agrees very well with experiments. The formation of an exciton due to emission of longitudinal optical phonon is found to be more efficient at relatively small values of K ‖, and that due to acoustic phonon emission is more efficient at relatively large K ‖ values for carrier temperature Te-h≲50 K.

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Electron-confined longitudinal optical phonon interaction and strong magnetic field effects on the binding energy in GaAs quantum wells

Journal of Applied Physics ◽

10.1063/1.1430532 ◽

2002 ◽

Vol 91 (4) ◽

pp. 2093-2098 ◽

Cited By ~ 2

Author(s):

N. Es-Sbai ◽

A. Sali ◽

M. Fliyou ◽

E. Abarkan

Keyword(s):

Magnetic Field ◽

Binding Energy ◽

Quantum Wells ◽

Strong Magnetic Field ◽

Optical Phonon ◽

Longitudinal Optical ◽

Longitudinal Optical Phonon ◽

Magnetic Field Effects ◽

Phonon Interaction ◽

Field Effects

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Electron–Interface–Phonon Interaction and Magnetopolaronic Impurity Transitions in Quantum Wells

International Journal of Modern Physics B ◽

10.1142/s0217979297000502 ◽

1997 ◽

Vol 11 (08) ◽

pp. 991-1008 ◽

Cited By ~ 4

Author(s):

R. Chen ◽

D. L. Lin

Keyword(s):

Quantum Wells ◽

Optical Phonon ◽

Phonon Frequency ◽

Transition Energy ◽

Bulk Sample ◽

Longitudinal Optical ◽

Longitudinal Optical Phonon ◽

Phonon Modes ◽

Phonon Interaction ◽

Double Heterostructure

The polaronic effect on the hydrogenic 1s–2p+ transition energy of a donor impurity located at the quantum well center in a double heterostructure is studied theoretically in detail. The electron–optical–phonon interaction Hamiltonian is derived on the basis of eigenmodes of lattice vibrations supported by the double heterostructure. Both the confined and interface phonon modes are included in the electron–phonon coupling. The transition energy is calculated as a function of the applied magnetic field for GaAs/Al 1-x Ga x As samples of well -widths d=125 Å, 210 Å and 450 Å by the second-order perturbation. Wide transition gaps are predicted around the two-level and three-level resonances for all three cases. It is found that the transition gap narrows with the increasing well-width but remains larger than the LO and TO phonon frequency difference for d=450 Å as is observed. We also perform the same calculation by assuming that the confined electron interacts with three-dimensional and two-dimensional phonon modes. The transition energy spectra from these calculations appear to be similar to those for a bulk sample, the spectrum splits at the resonance with the longitudinal optical phonon frequency only. From comparisons of our results with these calculations as well as with experiments, it is conclusively established that the wide gap of transition energy is solely due to the interface modes.

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Effects of exciton–longitudinal optical phonon interaction and quantum confinement on exiton binding energies in ZnS1-xSex/ZnS single quantum wells

Journal of Physical Studies ◽

10.30970/jps.15.4702 ◽

2011 ◽

Vol 15 (4) ◽

Author(s):

Chikara Onodera

Keyword(s):

Quantum Wells ◽

Optical Phonon ◽

Quantum Confinement ◽

Longitudinal Optical ◽

Binding Energies ◽

Longitudinal Optical Phonon ◽

Single Quantum ◽

Phonon Interaction

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Exciton–phonon interaction in quasi-two dimensional layered (PEA)2(CsPbBr3)n−1PbBr4 perovskite

Nanoscale ◽

10.1039/c9nr06834a ◽

2019 ◽

Vol 11 (45) ◽

pp. 21867-21871 ◽

Cited By ~ 4

Author(s):

Hao Long ◽

Xiang Peng ◽

Jianxun Lu ◽

Kebin Lin ◽

Liqiang Xie ◽

...

Keyword(s):

Optical Phonon ◽

Coupling Strength ◽

Acoustic Phonon ◽

Longitudinal Optical ◽

Longitudinal Optical Phonon ◽

Two Dimensional ◽

Phonon Coupling ◽

Phonon Interaction ◽

2D Material ◽

Exciton Coupling

Exciton–phonon interaction in quasi-2D material was investigated. It was shown that longitudinal optical phonon, rather than acoustic phonon-exciton coupling dominated the enhancement of exciton–phonon coupling strength.

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