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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: In this paper, it was shown that most of the observed energy dependence of the local equivalent bare potential arises from the exchange nonlocality, which is an intrinsically quantum phenomenon and can be studied through the refractive elastic scattering of these systems at intermediate energies.
Abstract: Nonlocal interactions are an intrinsically quantum phenomenon. In this work we point out that, in the context of heavy ions, such interactions can be studied through the refractive elastic scattering of these systems at intermediate energies. We show that most of the observed energy dependence of the local equivalent bare potential arises from the exchange nonlocality. The nonlocality parameter extracted from the data was found to be very close to the one obtained from folding models. The effective mass of the colliding, heavy-ion, system was found to be close to the nucleon effective mass in nuclear matter.
71 citations
TL;DR: In this paper, angle-resolved photoemission spectroscopy studies on a series of FeTe1−xSex monolayer films grown on SrTiO3 were performed.
Abstract: We performed angle-resolved photoemission spectroscopy studies on a series of FeTe1−xSex monolayer films grown on SrTiO3. The superconductivity of the films is robust and rather insensitive to the variations of the band position and effective mass caused by the substitution of Se by Te. However, the band gap between the electron- and hole-like bands at the Brillouin zone center decreases towards band inversion and parity exchange, which drive the system to a nontrivial topological state predicted by theoretical calculations. Our results provide a clear experimental indication that the FeTe1−xSex monolayer materials are high-temperature connate topological superconductors in which band topology and superconductivity are integrated intrinsically.
71 citations
TL;DR: In this paper, the electronic structure and optical properties of orthorhombic, monoclinic, and rhombohedral (corundum type) modifications of ZnSiO3 and Zn2SiO4 have been studied using ab initio density functional theory calculations.
Abstract: The electronic structure and optical properties of orthorhombic, monoclinic, and rhombohedral (corundum type) modifications of ZnSiO3, and of rhombohedral, tetragonal, and cubic (spinel type) modifications of Zn2SiO4 have been studied using ab initio density functional theory calculations. The calculated fundamental band gaps for the different polymorphs and compounds are in the range 2.22–4.18 eV. The lowest conduction band is well dispersive similar to that found for transparent conducting oxides such as ZnO. This band is mainly contributed by Zn 4s electrons. The carrier effective masses were calculated and compared with those for ZnO. The topmost valence band is much less dispersive and contributed by O 2p and Zn 3d electrons. From the analysis of charge density, charges residing in each site, and electron localization function, it is found that ionic bonding is mainly ruling in these compounds. The calculated optical dielectric tensors show that the optical properties of ZnSiO3 and Zn2SiO4 are almost...
71 citations
TL;DR: In this article, the authors have studied carbon-induced two-dimensional energy bands on Ru(0001) using angle-resolved photoelectron spectroscopy and compared them with ab initio calculations.
71 citations
TL;DR: In this paper, the authors studied the infrared absorption at near liquid helium temperature for $n$-and $p$-type degenerate samples of various carrier concentrations, at photon energies larger than the energy gap, depending on the hole concentration.
Abstract: Infrared absorption is studied at near liquid helium temperature for $n$- and $p$-type degenerate samples of various carrier concentrations. The absorption in $p$-type samples, at photon energies larger than the energy gap, depends on the hole concentration. The results show that the valence band is warped and that the energy at $k=0$ is very close to the maximum energy of the band. A step in the absorption of $n$-type samples is observed which gives an estimate of $\ensuremath{\sim}0.012m$ for the effective mass of light holes. The long wavelength absorption in $p$-type samples is characteristic of intervalence band transitions.
71 citations