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Effective mass (solid-state physics)
About: Effective mass (solid-state physics) is a research topic. Over the lifetime, 12539 publications have been published within this topic receiving 295485 citations.
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TL;DR: Core polarization renormalizes the single-particle strength by ≈ 25% in intermediate and heavy nuclei and produces a corresponding increase in the effective mass of particles near the Fermi surface as discussed by the authors.
94 citations
TL;DR: Strain Hamiltonian and k⋅p theory are employed to calculate low-field hole mobility of strained Si layers on (100)Si1−xGex substrate as discussed by the authors.
Abstract: Strain Hamiltonian and k⋅p theory are employed to calculate low‐field hole mobility of strained Si layers on (100)Si1−xGex substrate. Nonparabolicity and the warped nature of the valence bands are included. At room temperature, in‐plane hole mobilities of strained Si are found to be 1103 and 2747 cm 2 V−1 s−1 for x equal to 0.1 and 0.2, respectively. These hole mobilities are, respectively, 2.4 and 6 times higher than that of bulk Si. This improvement in the mobility results is mainly due to the large splitting energy between the occupied light‐hole band and the empty heavy‐hole band and smaller effective mass. The effect of p‐type doping on mobility is also presented.
93 citations
TL;DR: In this paper, a general method for obtaining exact solutions of Schr\"{o}dinger equations with a position dependent effective mass was proposed and compared with those obtained within the frame of supersymmetric quantum theory.
Abstract: We outline a general method for obtaining exact solutions of Schr\"{o}dinger equations with a position dependent effective mass and compare the results with those obtained within the frame of supersymmetric quantum theory. We observe that the distinct effective mass Hamiltonians proposed in the literature in fact describe exactly equivalent systems having identical spectra and wave functions as far as exact solvability is concerned. This observation clarifies the Hamiltonian dependence of the band-offset ratio for quantum wells.
93 citations
TL;DR: The BP/MoS2 shows great potential to be a very efficient ultra-violet photodetector and exhibits modulation of its carrier effective mass and carrier concentration by the applied compressive strain, suggesting that mobility engineering and good piezoelectric effect can be realized in BP/ MoS2 heterostructure.
Abstract: The structural, electronic, transport and optical properties of black phosphorus/MoS2 (BP/MoS2) van der Waals (vdw) heterostructure are investigated by using first principles calculations. The band gap of BP/MoS2 bilayer decreases with the applied normal compressive strain and a semiconductor-to-metal transition is observed when the applied strain is more than 0.85 A. BP/MoS2 bilayer also exhibits modulation of its carrier effective mass and carrier concentration by the applied compressive strain, suggesting that mobility engineering and good piezoelectric effect can be realized in BP/MoS2 heterostructure. Because the type-II band alignment can facilitate the separation of photo-excited electrons and holes, and it can benefit from the great absorption coefficient in ultra-violet region, the BP/MoS2 shows great potential to be a very efficient ultra-violet photodetector.
93 citations
TL;DR: In this paper, a tight-binding molecular orbital model of a conducting chain of large planar organic molecules was used to show that the charge density wave state in the organic metal TTF-TCNQ is stabilized predominantly by a set of small amplitude intra molecular distortions while the condensate effective mass characterizing its dynamical properties is dominated by large amplitude inter molecular distortions.
93 citations