Mesoscopic finite-size effects of unconventional electron transport in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">PdCoO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
Mesoscopic finite-size effects of unconventional electron transport in
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">PdCoO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal" 中非常规电子输运的介观有限尺寸效应
DOI：
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发表时间：
2021
影响因子：
3.4
通讯作者：
P. Narang
中科院分区：
文献类型：
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作者：
Georgios Varnavides;Yaxian Wang;P. Moll;P. Anikeeva;P. Narang
最近在单晶铜铁矿金属中观察到了广泛的非常规输运现象。在这里，我们提出了一个理论框架来阐明电子输运使用的各向异性玻尔兹曼输运方程的第一性原理计算和数值模拟相结合。以PdCoO_2为模型系统，研究了不同温度下准粒子的微观电子和声子散射机制，建立了准粒子的平均自由程体系。我们对待各向异性费米表面明确数值获得实验上可访问的传输可观的，“扩散”，“弹道”和“流体动力学”的运输制度限制之间的桥梁。我们说明了“准弹道”和“准流体动力学”制度之间的区别是具有挑战性的，往往需要定量的性质。从第一性原理计算，我们填充由此产生的运输制度图，并演示如何费米表面取向增加了复杂性，在微尺度设备中观察到的运输签名。我们的工作提供了关键的见解开放的六边形费米表面上的微观相互作用机制，并建立其连接到有限尺寸通道中的宏观电子输运。
A wide range of unconventional transport phenomena have recently been observed in single-crystal delafossite metals. Here, we present a theoretical framework to elucidate electron transport using a combination of first-principles calculations and numerical modeling of the anisotropic Boltzmann transport equation. Using PdCoO$_2$ as a model system, we study different microscopic electron and phonon scattering mechanisms and establish the mean free path hierarchy of quasiparticles at different temperatures. We treat the anisotropic Fermi surface explicitly to numerically obtain experimentally-accessible transport observables, which bridge between the"diffusive","ballistic", and"hydrodynamic"transport regime limits. We illustrate that distinction between the"quasi-ballistic", and"quasi-hydrodynamic"regimes is challenging and often needs to be quantitative in nature. From first-principles calculations, we populate the resulting transport regime plots, and demonstrate how the Fermi surface orientation adds complexity to the observed transport signatures in micro-scale devices. Our work provides key insights into microscopic interaction mechanisms on open hexagonal Fermi surfaces and establishes their connection to the macroscopic electron transport in finite-size channels.
影响因子：
19.6
作者：
Vool, Uri;Hamo, Assaf;Yacoby, Amir
通讯作者：
Yacoby, Amir
影响因子：
5.7
作者：
Jaoui, Alexandre;Fauque, Benoit;Behnia, Kamran
通讯作者：
Behnia, Kamran