Evidence for Dominant Phonon-Electron Scattering in Weyl Semimetal 
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Osterhoudt, Gavin B.; Wang, Yaxian; Garcia, Christina A. C.; Plisson, Vincent; Gooth, Johannes; Felser, Claudia; Narang, Prineha; Burch, Kenneth S.

doi:10.1103/physrevx.11.011017

Cited by 49 publications

(41 citation statements)

References 48 publications

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“…It is shown theoretically that such an "acoustic bunching effect" limits the phase space for anharmonic decay of optical to acoustic phonons, leading to the dominance of ph-el over ph-ph scattering 42,43 . A similar effect is likely to suppress anharmonic phonon decays and produce high conductivity as observed in the Weyl semimetal WP 2 , which also has a lowsymmetry coordination environment 2,18 . We propose the combination of a chiral lattice structure, short metallic bonds, and low-symmetry coordination complex as design principles to create new candidate materials for el-ph liquid 11,12 .…”

Section: Discussionmentioning

confidence: 79%

“…where ω 0 is the phonon frequency, and ω a is the energy difference between the electron's initial state and the Fermi energy in a phonon-mediated inter-band scattering 18 . Note that Eq.…”

Section: Raman Scatteringmentioning

confidence: 99%

“…Such comparisons indicate that el-el correlations cannot be responsible for the mass enhancement in NbGe 2 , suggesting the el-ph coupling as a plausible mechanism. It is also interesting to compare NbGe 2 to WP 2 and PdCoO 2 , where strong ph-el interactions and a potential hydrodynamic transport have been evoked 15 , 16 , 18 . The effective dHvA masses are less than 1 m e and 1.5 m e in WP 2 and PdCoO 2 , respectively 27 , 28 , considerably smaller than NbGe 2 .…”

Section: Quantum Oscillationsmentioning

confidence: 99%

“…Here, we present mounting evidence of such a liquid in the 3D system NbGe 2 from three distinct measurements, namely torque magnetometry, electrical and thermal transport, and Raman scattering. Although a subset of these evidence can be found in quasi-2D systems PdCoO 2 15,16 , PtSn 4 17 , WP 2 2,18 , and WTe 2 19 , such comprehensive evidence of an electron-phonon liquid in a 3D structure has been hitherto missing from the literature. We also discuss the structureproperty relationships that lead to the observed behavior and propose design principles to create future 3D candidate materials.…”

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confidence: 99%

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Evidence of a coupled electron-phonon liquid in NbGe2

et al. 2021

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Whereas electron-phonon scattering relaxes the electron’s momentum in metals, a perpetual exchange of momentum between phonons and electrons may conserve total momentum and lead to a coupled electron-phonon liquid. Such a phase of matter could be a platform for observing electron hydrodynamics. Here we present evidence of an electron-phonon liquid in the transition metal ditetrelide, NbGe2, from three different experiments. First, quantum oscillations reveal an enhanced quasiparticle mass, which is unexpected in NbGe2 with weak electron-electron correlations, hence pointing at electron-phonon interactions. Second, resistivity measurements exhibit a discrepancy between the experimental data and standard Fermi liquid calculations. Third, Raman scattering shows anomalous temperature dependences of the phonon linewidths that fit an empirical model based on phonon-electron coupling. We discuss structural factors, such as chiral symmetry, short metallic bonds, and a low-symmetry coordination environment as potential design principles for materials with coupled electron-phonon liquid.

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Section: Discussionmentioning

confidence: 79%

Section: Raman Scatteringmentioning

confidence: 99%

Section: Quantum Oscillationsmentioning

confidence: 99%

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confidence: 99%

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Evidence of a coupled electron-phonon liquid in NbGe2

et al. 2021

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“…WSMs that host emergent Weyl fermions in the bulk and surface Fermi arc states [5][6][7][8] are of great interest for physicists and material scientists. They have numerous intriguing properties such as the nonlinear Hall effect, [15] phonon-electron fluid behavior, [16] anomalous Hall effect (AHE), [17] anomalous Nernst effect, [18] and chiral anomalyinduced magnetotransport. [19][20][21] However, experimental realization of the electronic correlation effect in WSMs, that is, correlated WSMs, has been quite limited because of the rare examples [7,14] in nature.…”

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confidence: 99%

Correlated Magnetic Weyl Semimetal State in Strained Pr₂Ir₂O₇

Son

et al. 2021

Advanced Materials

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Correlated topological phases (CTPs) with interplay between topology and electronic correlations have attracted tremendous interest in condensed matter physics. Therein, correlated Weyl semimetals (WSMs) are rare in nature and, thus, have so far been less investigated experimentally. In particular, the experimental realization of the interacting WSM state with logarithmic Fermi velocity renormalization has not been achieved yet. Here, experimental evidence of a correlated magnetic WSM state with logarithmic renormalization in strained pyrochlore iridate Pr2Ir2O7 (PIO) which is a paramagnetic Luttinger semimetal in bulk, is reported. Benefitting from epitaxial strain, “bulk‐absent” all‐in–all‐out antiferromagnetic ordering can be stabilized in PIO film, which breaks time‐reversal symmetry and leads to a magnetic WSM state. With further analysis of the experimental data and renormalization group calculations, an interacting Weyl liquid state with logarithmically renormalized Fermi velocity, similar to that in graphene, is found, dressed by long‐range Coulomb interactions. This work highlights the interplay of strain, magnetism, and topology with electronic correlations, and paves the way for strain‐engineering of CTPs in pyrochlore iridates.

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Symmetry‐Guaranteed High Carrier Mobility in Quasi‐2D Thermoelectric Semiconductors

et al. 2023

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Quasi‐2D semiconductors have garnered immense research interest for next‐generation electronics and thermoelectrics due to their unique structural, mechanical, and transport properties. However, most quasi‐2D semiconductors experimentally synthesized so far have relatively low carrier mobility, preventing the achievement of exceptional power output. To break through this obstacle, a route is proposed based on the crystal symmetry arguments to facilitate the charge transport of quasi‐2D semiconductors, in which the horizontal mirror symmetry is found to vanish the electron–phonon coupling strength mediated by phonons with purely out‐of‐plane vibrational vectors. This is demonstrated in ZrBeSi‐type quasi‐2D systems, where the representative sample Ba1.01AgSb shows a high room‐temperature hole mobility of 344 cm2 V−1 S−1, a record value among quasi‐2D polycrystalline thermoelectrics. Accompanied by intrinsically low thermal conductivity, an excellent p‐type zT of ≈1.3 is reached at 1012 K, which is the highest value in ZrBeSi‐type compounds. This work uncovers the relation between electron–phonon coupling and crystal symmetry in quasi‐2D systems, which broadens the horizon to develop high mobility semiconductors for electronic and energy conversion applications.

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Evidence for Dominant Phonon-Electron Scattering in Weyl Semimetal WP2

Cited by 49 publications

References 48 publications

Evidence of a coupled electron-phonon liquid in NbGe2

Evidence of a coupled electron-phonon liquid in NbGe2

Correlated Magnetic Weyl Semimetal State in Strained Pr₂Ir₂O₇

Symmetry‐Guaranteed High Carrier Mobility in Quasi‐2D Thermoelectric Semiconductors

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Evidence for Dominant Phonon-Electron Scattering in Weyl Semimetal WP2

Cited by 49 publications

References 48 publications

Evidence of a coupled electron-phonon liquid in NbGe2

Evidence of a coupled electron-phonon liquid in NbGe2

Correlated Magnetic Weyl Semimetal State in Strained Pr2Ir2O7

Symmetry‐Guaranteed High Carrier Mobility in Quasi‐2D Thermoelectric Semiconductors

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Product

Resources

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Correlated Magnetic Weyl Semimetal State in Strained Pr₂Ir₂O₇