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arXiv 1407.6002cond-mat.supr-concond-mat.str-el
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高温铜氧化物超导体中的Berry相和本征热霍尔效应

Berry phases and the intrinsic thermal Hall effect in high temperature cuprate superconductors

Vladimir Cvetkovic, Oskar Vafek

摘要:

在高温铜氧化物超导体的涡旋态中,Bogoliubov准粒子在几乎均匀的磁场中运动。当准粒子在外加热流${\bf j}_Q$的作用下运动时,会受到洛伦兹力的作用,从而使它们的轨道弯曲,并产生垂直于${\bf j}_Q$和外加场${\bf H}$的温度梯度吗?或者,热霍尔效应是贝里相的结果,就像自旋轨道耦合的半导体/金属的固有反常霍尔效应一样?在这里,我们表明,它是后者,并为第一次,计算温度,${\bf H}$ -场和$d$ -波配对间隙$Δ$依赖的本征热霍尔电导率,$κ_{xy}$。我们发现,$κ_{xy}$的内在贡献显示出快速的发病与温度的升高,这与现有的实验相比,在高${\bf H}$ -领域的最高纯度的样品。这一发现可能有助于解决一个长期争论的问题,即磁场中铜氧化物超导体的对强度的整体值。

英文摘要:

The Bogoliubov quasiparticles move in a practically uniform magnetic field in the vortex state of high temperature cuprate superconductors. Do the quasiparticles experience a Lorentz force when set in motion by an externally applied heat current ${\bf j}_Q$, bending their trajectories and causing the temperature gradient perpendicular to ${\bf j}_Q$ and the applied field ${\bf H}$, or is the thermal Hall effect a consequence of Berry phases as in an intrinsic anomalous Hall effect of a semiconductor/metal with spin-orbit coupling? Here we show that it is the latter, and for the first time, calculate the temperature, ${\bf H}$-field and the $d$-wave pairing gap $Δ$ dependence of the intrinsic thermal Hall conductivity, $κ_{xy}$. We find that the intrinsic contribution to $κ_{xy}$ displays a rapid onset with increasing temperature, which compares favourably with existing experiments at high ${\bf H}$-fields on the highest purity samples. This finding may help to settle a much-debated question of the bulk value of the pairing strength in cuprate superconductors in magnetic field.

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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