Phonon drag effect

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August undefined, 2024

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 … 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).

Phonon-drag effects on thermoelectric power – arXiv Vanity

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. WebSep 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 … bandukwala movie

Electron-phonon drag enhancement of transport …

WebElectron–phonon interaction might also affect thermoelectric properties, for example, the Seebeck coefficient could also be enhanced through the phonon-drag effect 164. First-principles... WebFeb 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. WebIn our opinion this assumption is questionable. The analysis reported here includes the phonon-drag component S g of thermoelectric power using the balance equation approach, which has the advantage of easy inclusion of hot electron effects. In this, we clarify the importance of the contribution of S g to thermoelectric power in the hot-electron transport … artusi pentole esselunga

Colossal Seebeck effect enhanced by quasi-ballistic phonons

Phonon drag effect

Effect of Phonon Drag on the Thermopower in a Parabolic

http://export.arxiv.org/abs/2304.00165 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 …

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WebMar 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 … WebFeb 7, 2024 · The first is called the electron drag and the latter, phonon drag. In an interacting electron–phonon gas, however, the two effects are inseparable and a mutual …

WebJul 16, 2024 · Thus, it is clarified that the roughness on the wire surface is an important factor for the phonon-drag effect in the Si Seebeck coefficient. Hence, for preserving the … 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 …

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 the thermal and electrical conductivities, while having weak effects on the enhancement of the Lorenz number and thermopower. WebSep 6, 2016 · Although the phonon carries heat, which reduces the thermoelectric efficiency, it contributes positively to the Seebeck coefficient S through the phonon-drag effect, as …

WebMay 13, 2014 · Phonon-drag effect in FeGa3. The thermoelectric properties of single- and polycrystalline FeGa3 are systematically investigated over a wide temperature range. At …

WebSep 6, 2016 · Phonon transport is an essential property of thermoelectric materials. Although the phonon carries heat, which reduces the thermoelectric efficiency, it contributes positively to the Seebeck coefficient S through the phonon-drag effect, as typified by the high-purity semiconductors, which show fairly large S at cryogenic temperatures. banduk wali gameWebNov 30, 2024 · Since phasons can be considered an ultimate phonon drag effect, it is of interest to see its effects on thermoelectricity, which is studied in the present paper based on linear response theory of Kubo and Luttinger. bandukwala video gameWebJul 15, 2024 · The phonon drag effect can be also described by the Boltzmann theory and the linear response theory. This phonon drag effect can lead to a large Seebeck effect at low tem-peratures in, e.g.,... bandukwala rahil abdemannan doWebMar 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 charge mobility and Seebeck coefficient in GaN and AlN by solving the fully coupled electron and phonon Boltzmann transport equations with ab initio scattering parameters. We find … artusi ragu bologneseWebMay 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 … bandulWebDec 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 … bandulaWebOct 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 … artusi undermount rangehood