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强关联材料霍尔热导率实验测量综述 被引量:1
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作者 徐豪 承舒凡 +1 位作者 鲍嵩 温锦生 《物理学进展》 CSCD 北大核心 2022年第5期159-183,共25页
在材料中输入热流并在垂直于热流的方向上施加磁场时,热载流子将可能被磁场偏转,获得横向速度,从而导致材料在横向出现一个温度梯度。这种效应被称为热霍尔效应(THE)。与电霍尔效应类似,热霍尔效应被预言将在一些拥有非平庸贝利曲率的... 在材料中输入热流并在垂直于热流的方向上施加磁场时,热载流子将可能被磁场偏转,获得横向速度,从而导致材料在横向出现一个温度梯度。这种效应被称为热霍尔效应(THE)。与电霍尔效应类似,热霍尔效应被预言将在一些拥有非平庸贝利曲率的材料中出现,因此它可以揭示材料的拓扑性质。然而,热霍尔效应并不像电霍尔一样,只局限于载流子带电的体系;相反,任何种类的准粒子都可以导热。因此,热霍尔效应也可以用来探索强关联电子体系材料(尤其是绝缘体)的奇异性质。因此,热霍尔效应更具有普适性,并日益成为探测电中性激发,如声子和磁振子的强有力手段。不仅如此,有如手性声子这样超越一般非平庸贝利曲率图像的因素仍可导致热霍尔效应;探查其中的热霍尔效应将为理解材料中复杂的微观机理指明方向。但是,热信号比电信号要微弱得多。尤其是测量热霍尔效应,往往要在较大背景噪音中提取微弱的有效信号,这使霍尔热导的测量极具挑战性。但是得益于科研工作者大量的努力,该领域在近几年发展迅速,得到了许多十分有趣的结果。在本文中,我们将简要总结现有的一些令人兴奋的在霍尔热导率测量方面的成果,指出尚未解决的问题,并提出未来可能的方向。 展开更多
关键词 热霍尔效应 拓扑 量子自旋液体 多铁材料 赝能隙相
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Peristalsis of nanofluid through curved channel with Hall and Ohmic heating effects 被引量:2
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作者 T.HAYAT B.AHMED +1 位作者 F.M.ABBASI A.ALSAEDI 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第9期2543-2553,共11页
Nanofluids have attracted many scientists due to their remarkable thermophysical properties.Small percentage of nanoparticles when added to conventional fluid significantly enhances the heat transfer features.Sustaina... Nanofluids have attracted many scientists due to their remarkable thermophysical properties.Small percentage of nanoparticles when added to conventional fluid significantly enhances the heat transfer features.Sustainability and efficiency of nanomaterials have key role in the advancement of nanotechnology.This article analyzes the Hall,Ohmic heating and velocity slip effects on the peristalsis of nanofluid.Convective boundary conditions and heat generation/absorption are considered to facilitate the heat transfer characteristics.Governing equations for the peristaltic flow through a curved channel are derived in curvilinear coordinates.The equations are numerically solved under the assumption of long wavelength and small Reynold number.It has been observed that nanofluid enhances the heat transfer rate and reduces the fluid temperature.Hartman number and Hall parameter show reverse behavior in fluid motion and heat transfer characteristics.In the presence of velocity slip,the pressure gradient rapidly decreases and dominant effect is seen in narrow portion of channel. 展开更多
关键词 PERISTALSIS NANOFLUID Hall and Ohmic heating effects convective boundary condition velocity slip effects
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