Dielectric function in HgSe at 2, 95, and 300 K

Abstract

Reflectivity spectra of n-HgSe with various carrier concentrations are measured in the spectral region 20 to 500 cm-l. Their main features are well explained by the theoretical dielectric function which is constructed as a sum of r8-r8 interband, intraband, and phonon contributions and is calculated using the available values of band parameters in the full Kane theory. The effect of the interband contribution on the plasmon-LO phonon coupling and on the frequency of LO phonon is discussed. Possible origins for the discrepancy between experimental and calculated spectra are also discussed.Reflexionsspektren von n-HgSe mit verschiedenen Elektronenkonzentrationen werden im Spektralbereich von 20 bis 500 cm-l gemessen. Der vorwiegende Verlauf wird mit der theoretischen dielektrischen Funktion gut erkliirt, die als Summe aus r8-r8-Interband-, Intraband-und PhononBeitriigen angesetzt wird und die mit verfiigbaren Werten der Parameter mittels der Kaneschen Theorie berechnet wird. Es wird der EinfluB des Interband-Beitrags auf die Plasmon-LO-PhononKopplung und auf die Frequenz des LO-Phonons diskutiert. Der mogliche Ursprung fur die Diskrepanz zwischen experimentellen und berechneten Spektren wird ebenfalls diskutiert.

Plasmon–phonon interaction in Hg1−xMnxSe alloys

“…5b were obtained by solving Eqs. [10] and FIR reflectivity measurements [6,17,18]. We achieved a very good agreement between the experimental results and theoretical results obtained by application of this model.…”

The Two‐Phonon Resonant Effect in Far‐Infrared Reflectivity of HgSe

“…Manabe et al [7] did not observe this structure a t 300 K. They observed two weak modes at 2 and 95 K with the oscillator strength independent of temperature ( F = 0.5) and these results cannot be explained by the resonant two-phonon process.…”

“…2. The role of this average in the analysis of free-carrier optical effects was discussed in [7]. I n the frame of the classical theory of independent harmonic oscillators, the phonon part of the DDF is given by the sum where o, is the transverse optical phonon wave number, F, the oscillator strength, r, the damping parameter accordiq to nonharmonicity (in the same units as w,).…”

Iron Impurity Related Optical Transitions in HgSe:Fe

“…The maximum absorption coefficient is about 450 cm-1 , the full width at half maximum is about (85 ± 3) cm -1 . The second broad bump lies in the spectral range 2540-2650 cm -1 and corresponds to the optical phonon-assisted transitions [12,13]. The peak at 2423 cm -1 is not split into the separated zerophonon transitions.…”