Phonon properties and doping of Zn1–x Mnx Se epilayers grown by molecular‐beam epitaxy

We present far-infrared (FIR) reflection studies for Zn, 1-x Mn x Se. It is found that a modified oscillator model provides improved agreement with the experimental data. Our results suggest an intermediate-mode behavior for the optical phonon modes in Zn 1-x Mn x Se. In addition to the known ZnSe-like and MnSe-like phonon resonances a weak defect-related feature 'D' is found below the MnSe-like phonon band. The frequency of this feature shows a temperature and Mn dependent red-shift. Furthermore, the observation of a drastic reduction in the free-electron concentration with increasing Mn content suggests a compensation effect related to the formation of Mn-related defect complexes.

[1]  L. Genzel,et al.  Model for Long ‐ Wavelength Optical‐Phonon Modes of Mixed Crystals , 1974 .

[2]  Philip M. Morse,et al.  Edward Uhler Condon, 1902-1974 , 1975 .

[3]  François Gervais,et al.  Temperature dependence of transverse- and longitudinal-optic modes in TiO 2 (rutile) , 1974 .

[4]  A. Hadni,et al.  Spectres d'absorption et de réflexion, dans l'infrarouge lointain, de ZnSe, ZnTe et CdSe à basse température , 1968 .

[5]  B. Segall,et al.  Some Electrical and Optical Properties of ZnSe , 1961 .

[6]  D. Gerthsen,et al.  Lattice parameter and elastic constants of cubic Zn1−xMnxSe epilayers grown by molecular‐beam epitaxy , 2004 .

[7]  Jacek K. Furdyna,et al.  Diluted magnetic semiconductors , 1988 .

[8]  Taguchi,et al.  Optical properties of ZnSe. , 1991, Physical review. B, Condensed matter.

[9]  J. Humlíček.  Transverse and longitudinal vibration modes in α-quartz , 1994 .

[10]  R. Fiederling,et al.  Injection and detection of a spin-polarized current in a light-emitting diode , 1999, Nature.

[11]  C. C. Lu,et al.  Infrared and Raman spectroscopic study ofZn1−xMnxSematerials grown by molecular-beam epitaxy , 1999 .

[12]  D. Marple,et al.  Electron Effective Mass in ZnSe , 1964 .

[13]  K. Easwaran.  NMR Study of Ferroelectric Diglycine Nitrate , 1966 .

[14]  Don Berlincourt,et al.  Electroelastic Properties of the Sulfides, Selenides, and Tellurides of Zinc and Cadmium , 1963 .

[15]  C. R. Crowell,et al.  Dielectric constant and its temperature dependence for GaAs, CdTe, and ZnSe , 1976 .

[16]  D. Gerthsen,et al.  Near-band-gap dielectric function of Zn 1-x Mn x Se thin films determined by spectroscopic ellipsometry , 2004 .

[17]  A. Manabe,et al.  Infrared Lattice Reflection Spectra of II-VI Compounds , 1967 .

[18]  C. Klingshirn,et al.  Carrier-density-dependent electron effective mass in Zn1−xMnxSe for 0⩽x⩽0.13 , 2005 .

[19]  W. Heimbrodt,et al.  Optical Properties of (Zn, Mn) and (Cd, Mn) Chalcogenide Mixed Crystals and Superlattices , 1988 .