Longitudinal-optical phonon hole-plasmon coupled modes in heavily doped p-type GaSb:Zn epitaxial films

Z. G. Hu (), M. B.M. Rinzan, A. G.U. Perera (), Y. Paltiel, A. Raizman, A. Sher and M. Zhu

The European Physical Journal B: Condensed Matter and Complex Systems, 2006, vol. 50, issue 3, 403-410

Abstract: Reflectance measurements from p-type GaSb:Zn epitaxial films with different hole concentrations (10 17 –10 18 cm -3 ) have been investigated over the frequency region of 100–1000 cm -1 . A minimum broadening feature corresponding to the hole plasmon was observed in the reflectance spectra. The experimental infrared spectra were well fitted using a Lorentz-Drude dispersion model. The real part ε 1 of the dielectric function decreases with increasing hole concentration. However, the imaginary part ε 2 increases with hole concentration in the far-infrared region. This indicates that the acoustic- and optic-phonons mainly participate in the free carrier absorption processes. The hole mobility obtained from Hall-effect measurements is slightly larger than that derived from optical measurements and the average ratio of mobilities is estimated to be 1.33. Owing to overdamping effects, the upper branch of longitudinal-optical phonon plasmon (LPP) coupled modes was observed. The upper LPP + frequency increases with hole concentration and it shows a transition from phonon-like to plasmon-like behavior. A theoretical analysis with solutions in the complex frequency plane describes these experimental results. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Keywords: 78.20.Ci Optical constants (including refractive index; complex dielectric constant; absorption; reflection and transmission coefficients; emissivity); 78.30.Fs III-V and II-VI semiconductors; 81.70.Fy Nondestructive testing: optical methods (search for similar items in EconPapers)
Date: 2006
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
http://hdl.handle.net/10.1140/epjb/e2006-00154-5 (text/html)
Access to full text is restricted to subscribers.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:spr:eurphb:v:50:y:2006:i:3:p:403-410

Ordering information: This journal article can be ordered from
http://www.springer.com/economics/journal/10051

DOI: 10.1140/epjb/e2006-00154-5

Access Statistics for this article

The European Physical Journal B: Condensed Matter and Complex Systems is currently edited by P. Hänggi and Angel Rubio

More articles in The European Physical Journal B: Condensed Matter and Complex Systems from Springer, EDP Sciences
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().