Internal strain parameter of silicon and GaAs and planar force constants |
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Authors: | Manuel Cardona Karel Kunc Richard M Martin |
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Institution: | Xerox Palo Alto Research Centers, 3333 Coyote Hill Road, Palo Alto, California 94304, USA |
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Abstract: | We show that the internal strain parameter ζ and elastic constants of the tetrahedral semiconductors can be determined from the force constants between planes of atoms. These have been computed recently for Si and GaAs from self-consistent electronic calculations using the Hellmann-Feynman theorem. The theoretical results are ζ = 0.72 for GaAs and ~0.57 for Si compared to experimental values of 0.76 and 0.73. |
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