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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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Journal ArticleDOI
TL;DR: In this article, the optical effective mass of tin-doped In 2 O 3 films prepared by r.f. reactive sputtering has been determined from measurements of the plasma resonance frequency in the near-infrared region and the refractive index in the visible region.

266 citations

Journal ArticleDOI
TL;DR: In this paper, the authors calculated the contribution of 90° domain walls to dielectric, piezoelectric and elastic properties of tetragonal ferroelectric ceramics.
Abstract: Domain wall contributions to the dielectric, piezoelectric, and elastic properties of tetragonal ferroelectric ceramics, as discussed extensively in the past, are calculated. A simple model shows that the motion of 90° domain walls causes a shear deformation and an approximately homogeneous electric field in the grain. The elastic and electric field energies involved allow the calculation of the force constant for the domain wall displacement by external fields. The displacements agree with experimental results. In a moderate electric field the displacement is a small fraction of the lattice cell only. By averaging over the orientational distributions of all grains the contributions of the 90° domain walls to the material properties are calculated for unpolarized and for polarized ceramics and agree with experimental results. The effective mass, which has to be attributed to the domain walls is the mass of the whole grain reduced by the factor S0 (spontaneous deformation), is independent of the domain wid...

264 citations

Journal ArticleDOI
TL;DR: In this paper, the absorption of free carriers in $n$-type silicon has been studied in a spectral region from 1 to 45 microns for samples of various impurity and carrier concentrations.
Abstract: The absorption by free carriers in $n$-type silicon has been studied in a spectral region from 1 to 45 microns for samples of various impurity and carrier concentrations. In all samples measured the absorption consists of a band between 1.5 and 5 microns in addition to an absorption which rises smoothly with wavelength. The absorption band is found to be proportional to the carrier concentration in samples doped with different donor impurities. It is suggested that the band is associated with the excitation of carriers to a higher lying energy band. The behavior of the smoothly rising portion of the absorption curve is in agreement with the Fan and Fr\"ohlich theory of free-carrier absorption. Quantitative agreement is obtained with a value of $0.3m$ for the effective mass.

264 citations

Journal ArticleDOI
TL;DR: The low-lying compression modes of a unitary Fermi gas with imbalanced spin populations with large population imbalance are investigated, finding m*/m = 1.17(10), in agreement with the most recent theoretical predictions.
Abstract: We investigate the low-lying compression modes of a unitary Fermi gas with imbalanced spin populations. For low polarization, the strong coupling between the two spin components leads to a hydrodynamic behavior of the cloud. For large population imbalance we observe a decoupling of the oscillations of the two spin components, giving access to the effective mass of the Fermi polaron, a quasiparticle composed of an impurity dressed by particle-hole pair excitations in a surrounding Fermi sea. We find m*/m = 1.17(10), in agreement with the most recent theoretical predictions.

264 citations

Journal ArticleDOI
TL;DR: In this article, Angle-resolved photoemission spectroscopy (ARPES) has been used to measure the energy and lifetime of the photohole in the experiment.
Abstract: Recent investigations of strongly correlated electron systems have questioned the validity of one of the most fundamental paradigms in solid state physics— Fermi liquid theory. The latter picture is based on the existence of “quasiparticles,” or single-particle-like low energy excitations which obey the exclusion principle and have lifetimes long enough to be considered as particles. Strictly speaking, the quasiparticle concept is restricted to zero temperature and a narrow region around the Fermi level [1], but its usefulness often continues to finite temperatures, and energies away from the Fermi level [2]. Indications for possible non-Fermi-liquid behavior have been found in some organic one-dimensional conductors [3] and in the normal state of high temperature superconductors [4]. A whole variety of experimental techniques have been employed in the search for such behavior, including resistivity measurements [5], infrared spectroscopy [6], scanning tunneling spectroscopy [7], and time-resolved two-photon photoemission [8]. Angle-resolved photoemission spectroscopy (ARPES) has an advantage, in that the energy and lifetime of the photohole are directly observable in the experiment. ARPES in principle measures the quasiparticle spectral function [9]:

264 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202215
2021410
2020421
2019395
2018362
2017412