Confinement of polar optical phonons in quasi-one-dimensional Wurtzite GaN-based quantum well wires: propagating and half-space phonon modes

• Authors: Li Zhang , Jun-Jie Shi
• Languages of publication: EN

Abstracts

EN

With the aid of the macroscopic dielectric continuum and Loudon’s uniaxial crystal models, the propagating (PR) and half-space (HS) optical phonon modes and corresponding Fröhlich-like electron-phonon interaction Hamiltonians in a quasi-one-dimensionality (Q1D) wurtzite quantum well wire (QWW) structure are derived and studied. Numerical calculations on a wurtzite GaN/Al0.15Ga0.85N QWW are performed, and discussion is focused mainly on the dependence of the frequency dispersions of PR and HS modes on the free wave-number k
z in the z-direction and on the azimuthal quantum number m. The calculated results show that, for given k
z and m, there usually exist infinite branches of PR and HS modes in the high-frequency range, and only finite branches of HS modes in the low-frequency range in wurtzite QWW systems. The reducing behaviors of the PR modes to HS modes, and of the HS mode to interface phonon mode have been observed clearly in Q1D wurtzite heterostructures. Moreover, the dispersive properties of the PR and HS modes in Q1D QWWs have been compared with those in Q2D quantum well structures. The underlying physical reasons for these features have also been analyzed in depth.

Keywords

EN

Propagating and half-space optical phonon modes; Wurtzite quantum well wire; GaN-based heterostructure

Discipline

• 78.67.Lt: Quantum wires
• 71.38.-k: Polarons and electron-phonon interactions(see also 63.20.K- Phonon interactions in lattice dynamics)

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2007
• Volume: 5
• Issue: 3
• Pages: 324-341

Dates

published

1 - 9 - 2007

online

12 - 4 - 2007

Contributors

author

Li Zhang

author

Jun-Jie Shi

• State Key Laboratory for Mesoscopic Physics, and School of Physics, Peking University, Beijing, 100871, People’s Republic of China

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Identifiers

DOI

10.2478/s11534-007-0017-6