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arXiv 2009.04477cond-mat.mes-hallcond-mat.mtrl-sciquant-ph
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WTe2中声子介导的流体动力学流动的成像

Imaging phonon-mediated hydrodynamic flow in WTe2

Uri Vool, Assaf Hamo, Georgios Varnavides, Yaxian Wang, Tony X. Zhou, Nitesh Kumar, Yuliya Dovzhenko, Ziwei Qiu, Christina A. C. Garcia, Andrew T. Pierce, Johan… 展开作者

Uri Vool, Assaf Hamo, Georgios Varnavides, Yaxian Wang, Tony X. Zhou, Nitesh Kumar, Yuliya Dovzhenko, Ziwei Qiu, Christina A. C. Garcia, Andrew T. Pierce, Johannes Gooth, Polina Anikeeva, Claudia Felser, Prineha Narang, Amir Yacoby

摘要:

在存在相互作用的情况下,凝聚态系统中的电子可以表现出流体动力学行为,表现出与经典流体相关的现象,如涡旋和Poiffille流。在大多数导体中,电子-电子相互作用被屏蔽效应最小化,阻碍了对流体动力学材料的研究;然而,最近,一类半金属被报道表现出突出的相互作用。在这里,我们研究的电流在层状半金属钨二碲化物通过成像的本地磁场使用的氮空位缺陷的金刚石。我们的图像的空间电流分布内的三维碲化钨,并发现它具有不均匀的电流密度,表明流体动力学流动。我们的温度分辨电流分布测量揭示了一个非单调的温度依赖性,最强的流体动力学效应在约20 K。我们还报告从头计算表明,电子-电子相互作用不能单独由库仑相互作用解释,但主要是由声子介导的。这为研究高载流子密度材料中的流体动力学流动和突出的电子相互作用提供了一个有前途的途径。

英文摘要:

In the presence of interactions, electrons in condensed-matter systems can behave hydrodynamically, exhibiting phenomena associated with classical fluids, such as vortices and Poiseuille flow. In most conductors, electron-electron interactions are minimized by screening effects, hindering the search for hydrodynamic materials; however, recently, a class of semimetals has been reported to exhibit prominent interactions. Here we study the current flow in the layered semimetal tungsten ditelluride by imaging the local magnetic field using a nitrogen-vacancy defect in a diamond. We image the spatial current profile within three-dimensional tungsten ditelluride and find that it exhibits non-uniform current density, indicating hydrodynamic flow. Our temperature-resolve current profile measurements reveal a non-monotonic temperature dependence, with the strongest hydrodynamic effects at approximately 20 K. We also report ab initio calculations showing that electron-electron interactions are not explained by the Coulomb interaction alone, but are predominantly mediated by phonons. This provides a promising avenue in the search for hydrodynamic flow and prominent electron interactions in high-carrier-density materials.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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