Phonon drag effect

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August undefined, 2024

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 … 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.

Photon Drag in Metal Films NIST

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 ... WebPhonon drag does not affect the electrical resistivity. σ is only affected by the rate that the electrons and phonons scatter from each other. That rate is not affected by phonon drag … high force traffic assetto corsa

Landau-Lifshitz theory of the magnon-drag thermopower

Webcan be enhanced at all by using the phonon drag effect. Theoretical estimations concluded that the phonon drag will not benefit the thermoelectrics (18), whereas an experiment on … 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 … WebNov 16, 2015 · The U.S. Department of Energy's Office of Scientific and Technical Information how i check my company red yellow green

Rev. Mod. Phys. 88, 025003 (2016) - Coulomb drag - Reviews of …

Modeling of Lattice Heat Conductivity and Thermopow er in …

WebHere, we focus on the phonon drag effect. Historically, a large Seebeck coefficient was observed in doped semiconductors such as Ge and Si, 6 – 8) which has been ascribed to … 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 … how i check my internet speedWebSep 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 … how i check my pan card details

"WebMar 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 … " - Phonon drag effect

Phonon drag effect

Colossal Seebeck effect enhanced by quasi-ballistic phonons

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 … WebDec 29, 2014 · However, the Seebeck effect can also have a phonon drag component, due to momentum exchange between charge carriers and lattice phonons, which is more difficult to quantify. In this work, we present the first study of phonon drag in the AlGaN/GaN two-dimensional electron gas (2DEG). We find that phonon drag does not contribute …

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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 … 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 …

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 … 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).

Webcarrier phonon drag effect. In contrast to the relaxation time of LW 3-phonon processes which is w ell described by the Herring s theory, the exact theoretical description of 4-phonon processe s is a very difficult and maybe a hopeless task, if quantitatively correct results are nee ded. Therefore we decided to evaluate WebApr 13, 2024 · The effect of phonon focusing on the drag thermopower and lattice thermal conductivity of bulk potassium crystals and nanostructures based on it was analyzed, and the spectrum and polarization vectors of phonons were determined in [1–4].In these studies, when analyzing the thermopower and lattice thermal conductivity, it was assumed that …

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 …

WebJul 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.,... how i check my credit scoreWebSep 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 … highford barn clovellyhttp://export.arxiv.org/abs/2304.00165 how i check my visa statusWebApr 1, 1996 · The phonon-drag voltage induced by acoustic phonons has been studied for the first time in 2D hole gas (2DHG) systems, formed in GaAs/AlGaAs heterostructures. … highford farm hexhamWebSep 8, 2014 · The contribution of the phonon drag effect to the Seebeck coefficient of P-doped ultrathin Si-on-insulator (SOI) layers with a thickness of 9–100 nm is investigated for near-room-temperature... how i check my credit score for freeWebJun 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. high force waterfall stargazingWebphonon modes contributing to carrier diffusion and phonon drag effect. The most efficient Thermoelectrics have been heavily doped semiconductors because the Pauli principle restricts the heat carrying electrons to within of the Fermi level for metals. Semiconductors have a lower density of carriers, leasing to larger thermopower values ... highford