The Hamiltonian of the interaction of electrons and spatially extended optical interface modes in two-la yer periodic structures is developed.Der Hamiltonoperator der Wechselwirkung von Elektronen und raumlich ausgedehnten optischen Grenzflachenmoden in einer periodischen Zwei-Schichtstruktur wird abgeleitet.
The optical anisotropy of the Sb2Se3 crystals was investigated at 300 and 11 K. Excitonic features of four excitons (A, B, C, and D) were observed in the optical spectra of the Sb2Se3 single crystals and in the photoelectric spectra of the Me–Sb2Se3 structures. The exciton parameters, such as the ground (n = 1) and excited (n = 2) state positions and the binding energy (Ry), were determined. The effective mass of the electrons at the bottom of the conduction band (m
c
* = 0.67m
0) as well as the holes at the four top valence bands (m
v1
* = 3.32m
0, m
v2
* = 3.83m
0, m
v3
* = 3.23m
0 and m
v4
* = 3.23m
0) were calculated in the Г-point of the Brillouin zone. The magnitude of the valence band splitting V1–V2 due to the spin–orbit interaction (Δso = 35 meV) and the crystal field (Δcf = 13 meV) were estimated in the Brillouin zone center. The energy splitting between the bands V3–V4 was 191 meV. The identified features were discussed based on both the theoretically calculated energy band structure and the excitonic band symmetry in the Brillouin zone (k = 0) for crystals with an orthorhombic symmetry (Рnma). The photoelectric properties of the Me–Sb2S3 structures were investigated in the spectral range 1–1.8 eV under E||c and E⟂c polarization conditions and at different applied voltages.
(b), and E. V. MIKHAILOVSKAYA (b) Results are given of the experimental investigation of exciton absorption spectra in superthin films of PbI, deposited on various substrates (glass, mica, metal). A theory of exciton states in thin polar films is developed, on the basis of which excitonic and band size effects are analyzed. The theory is in qualitative and quantitative agreement with the experiment.Exzitonenabsorptionsspektren werden in ultradiinnen Pb1,-Schichten auf verschiedenen Substraten (Glas, Glimmer, Metall) untersucht. Eine Theorie der Exzitonenzustiinde in diinnen polaren Schichten wird entwickelt, auf deren Grundlage Exzitonen-und Band-Size-Effekte analysiert werden. Die Theorie stimmt mit dem Experiment qualitativ und quantitativ iiberein.
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