Abstract
The dispersion curves of acoustic plasmons in strongly p-type SnTe are calculated using a model dielectric tensor based on the random phase approximation with exact analytic continuation into the lower half of the complex frequency plane. The crystalline character of the system is allowed for in the effective-mass approximation. For sufficiently large hole concentration the carriers occupy ellipsoidal pockets around the Sigma as well as the L maxima. Four systems with hole concentrations from 0.25 to 0.46 nm-3 have been studied. The acoustic plasmon is predicted to exist for some but not all directions of the wavevector. The most favourable direction is (111). For wavevectors less than the cut-off, the Landau damping by the 'faster' component is calculated and an estimate of the damping by Sn-vacancy scattering is also given. For SnTe with 0.38 holes/nm3, acoustic plasmons are predicted to exist in the (111) direction up to a maximum wavevector of 180 mu m-1, when the quantum energy has become 23 meV.
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