Tamm surface states of films Hg 1−xCd xTe

Abstract

Using Kane model Tamm surface states spectra for semimetal and semiconductor samples Hg 1−xCd xTe with finite thickness were obtained. In the limit of thin film (qL ⪡ 1, q - quasi-momentum of surface state, L - film thickness) only the spectrum of antisymmetric surface states differs significantly from that of bulk electrons. Ratio of effective mass of these states to that of bulk electrons, in the parabolic limit (ε g → ∞), is four ( m s m e =4) . In the nonparabolic limit (ε g → 0) the ratio of Kane parameter of these states to that of bulk electrons is half ( P s P e = 1 2 ) . In the limit of thick film (L → ∞) these ratios differ from unity for some percents (5 + 6%).