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- W1998100977 abstract "Using ab initio computational methods, we study the structural and electronic properties of strained silicon, which has emerged as a promising technology to improve the performance of silicon-based metal-oxide-semiconductor field-effect transistors. In particular, higher electron mobilities are observed in n -doped samples with monoclinic strain along the [110] direction, and experimental evidence relates this to changes in the effective mass as well as the scattering rates. To assess the relative importance of these two factors, we combine density-functional theory in the local-density approximation with the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M1><mml:mi>G</mml:mi><mml:mi>W</mml:mi></mml:math>approximation for the electronic self-energy and investigate the effect of uniaxial and biaxial strains along the [110] direction on the structural and electronic properties of Si. Longitudinal and transverse components of the electron effective mass as a function of the strain are derived from fits to the quasiparticle band structure and a diagonalization of the full effective-mass tensor. The changes in the effective masses and the energy splitting of the conduction-band valleys for uniaxial and biaxial strains as well as their impact on the electron mobility are analyzed. The self-energy corrections within<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M2><mml:mi>G</mml:mi><mml:mi>W</mml:mi></mml:math>lead to band gaps in excellent agreement with experimental measurements and slightly larger effective masses than in the local-density approximation." @default.
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- W1998100977 date "2015-01-01" @default.
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- W1998100977 title "<i>Ab Initio</i>Study of Strain Effects on the Quasiparticle Bands and Effective Masses in Silicon" @default.
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- W1998100977 doi "https://doi.org/10.1155/2015/453125" @default.
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