碲镉汞吸收缘以上E1和E2峰的指认

The fundamental reflectivity spectrum of HgCdTe have been investigated.The feature of the spectra is the presence of E₁ and E₂ peaks in the fundamental absorption region.The lower energy peak can be split into a doublet (E₁ and E₁＋Δ₁）.A three-dimensional saddle point is used to fit the E₁ and E₁+Δ₁ critical point and some simulated calculation is done for E₂ at X point.The calculated results are compared with the measured results and prominent features of the dielectric spectra are identified with critical-point transitions at the Λ and X points in the Brillouin zone.