Synchrotron-radiation study of narrow-band-gap ternary semimagnetic semiconductors: ${\mathrm{Hg}}_{1\mathrm{-}\mathrm{x}}$${\mathrm{Mn}}_{\mathrm{x}}$Se

Studies of the electronic structure of ${\mathrm{Hg}}_{1\mathrm{-}\mathrm{x}}$ ${\mathrm{Mn}}_{\mathrm{x}}$Se for 0≤x≤0.15 have been completed. Synchrotron-radiation photoemission measurements of crystals cleaved in situ show that the semiconductor surfaces are stable in ultrahigh vacuum with no change in surface stoichiometry observed with time. A main Mn-induced density-of-states feature is observed at 4.1 eV below the Fermi level with an intrinsic full width at half maximum of 0.5 eV. A systematic analysis of the photoemission cross section at the Mn 3p-3d resonance demonstrates that these states have a strong elemental Mn 3d character and are therefore responsible for the semiconductor’s unique magnetotransport and magneto-optical properties. Core photoemission results indicate that the presence of Mn in the lattice does not affect appreciably the stability of the Hg–Se chemical bond, as opposed to the case of Cd in ${\mathrm{Hg}}_{1\mathrm{-}\mathrm{x}}$ ${\mathrm{Cd}}_{\mathrm{x}}$Te alloys.