Phonon drag effect

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August undefined, 2024

WebMar 31, 2016 · The theory of phonon-drag thermopower resulting from a temperature gradient in the plane of a two-dimensional electron gas layer in a parabolic quantum well is developed. The interaction mechanisms between electrons and acoustic phonons are considered, taking into account potential screening of the interaction. It is found that the … WebSep 29, 2024 · This phonon-drag effect also induces an unusual, prominent temperature and field dependence of quantum oscillations in thermoelectric transport signals. On the other …

Phonon drag - Wikipedia

WebDec 29, 2014 · We present a theory of the phonon-drag Seebeck coefficient in nondegenerate semiconductors, and apply it to silicon for temperatures 30 < T < 300 K. Our calculation uses only parameters from the literature, and previous calculations of the phonon lifetime. We find excellent agreement with the measurements of Geballe and Hull … WebJan 31, 2002 · It has been predicted that the phonon drag thermopower will be enhanced in very low mobility samples. The effect occurs when ql No full-text available Citations (19) ... At relatively low... flinders university id card

Phonon-drag effects on thermoelectric power – arXiv Vanity

WebJul 6, 2024 · By definition, the phonon drag effects appear at the temperature of Ɵ D /5, where Ɵ D is the Debye temperature. It follows from this relation that Ɵ D can be estimated for both of the samples. WebOct 11, 2016 · The conventional phonon-drag effects have likewise been disregarded. A systematic study of the relative importance of the magnon and phonon drags is called upon in magnetic metals and semiconductors. Acknowledgments. This work is supported by the ARO under Contract No. 911NF-14-1-0016, FAME (an SRC STARnet center sponsored by … WebMar 1, 1988 · Here the upper two curves, for negligible i-i scattering, were included to demonstrate the "pure" drag phenomenon, because the low-field characteristics of the compensated material contains also an additional phonon-heating effect: the reduced cooling efficiency of the phonons leads to higher carrier energies and therefore to a … flinders university master of cyber security

Phys. Rev. Lett. 124, 105901 (2024) - Phonon Thermal Hall Effect in …

Phonon drag effect

Electron-phonon coupling and phonon-drag thermopower of a very …

WebThis is the first time we are able to simulate realistic thermoelectric materials from first principles without fitting parameters. Surprisingly, the phonon drag effect that is supposed to be only significant at low temperatures still contributes to … WebMay 10, 2016 · Coulomb drag, a term coined in analogy to phonon drag, refers to the effect of mutual friction between nonequilibrium conduction electrons belonging to two electrically isolated but closely spaced conductors. Coulomb drag experiments provide unique insight into microscopic properties of interacting many-body systems and are important in …

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WebJun 9, 2016 · An analogous effect called Coulomb drag occurs in two closely spaced two-dimensional electron gases: interlayer Coulomb interactions cause electrons flowing in one gas to drag along electrons in the other, generating a current. WebMar 1, 2013 · Our analysis indicates that a significant phonon-drag effect must take place in coarse-grained samples at low temperature. As the grain size decreases, the phonon …

WebApr 11, 2024 · In this article, we studied the past and existing research in nanowire (NW) especially based on SiGe NWs. The basic Thermoelectric (TE) principles ... Webphonon drag have longer mean free paths than those that carry heat (7), so far it is not clear to what extent one can decouple the con-tributions, that is, keep a significant phonon drag effect while re-ducing the lattice thermal conductivity, the latter of which has become a common strategy in increasing the thermoelectric effi-ciency (22–24).

WebDec 15, 2024 · Drag also strongly boosts the intrinsic electron mobility, thermal conductivity and the Lorenz number. Impurity scattering is seen to suppress the drag enhancement of … WebMar 31, 2024 · We study theoretically the effect of acoustic-phonon confinement on the phonon-drag thermopower Sg of a two-dimensional (2D) electron gas in a quantum well …

WebAug 23, 2024 · Thus, phonon drag, hitherto detected as an amplifier of thermoelectric coefficients, can generate a purely thermal transverse response in a dilute metal with a …

WebApr 15, 2024 · Upon dynamic loading (strain rate at ~10 3 s −1), the strain rate effect of materials is mainly affected by the viscous-drag effect 1,19,59, i.e., the interaction between the dislocations and ... flinders university learn without bordersWebMar 31, 2024 · In this work, we systematically examine the phonon drag effect, namely the momentum exchange between nonequilibrium phonons and electrons, and its impact on … greater endodontics rivertonWebFeb 19, 2013 · The spin Seebeck effect refers to the generation of a spin voltage caused by a temperature gradient in a ferromagnet, which enables the thermal injection of spin currents from the ferromagnet into an attached nonmagnetic metal over a macroscopic scale of several millimeters. flinders university master of itWebSep 2, 2024 · The results of an investigation on tensile stress dependence of mean Seebeck coefficient in Fe-based amorphous ribbons are presented, constituting a new Seebeck-sigma effect. A measurement test stand, capable of the determination of small variations in thermopower in such materials under stress is described. Exemplary results for … flinders university master of educationWebNov 16, 2015 · It has been well known that the phonon drag effect—an extra electrical current induced by phonon heat flow via electron–phonon interaction—can lead to … greater employee satisfactionWebMar 31, 2016 · The interaction mechanisms between electrons and acoustic phonons are considered, taking into account potential screening of the interaction. It is found that the … greater empire of japan greater enfield project