维度对滑动电荷密度波的影响:通过相干 X 射线衍射探测的准二维 TbTe$_3$ 体系案例
Effect of dimensionality on sliding charge density waves. The case of the quasi-two dimensional TbTe$_3$ system probed by coherent x-ray diffraction
AI总结:
本研究结合相干 X 射线衍射与原位输运测量,揭示准二维 TbTe$_3$ 中滑动 CDW 的阈值形变、旋转重排及相位变化特征。
摘要:
我们报告了在准二维 TbTe$_3$ 体系中,利用相干 X 射线衍射并结合原位输运测量所探测到的滑动电荷密度波(CDW)。我们表明,TbTe$_3$ 中的非欧姆电导之所以能够实现,是由于 CDW 发生了强烈畸变。我们随电流变化的衍射实验首先表明,在阈值电流 I$_S$ 以下,CDW 保持未畸变状态;而在阈值以上,它会因运动而突然旋转并重新有序化。与准一维体系相反,TbTe$_3$ 中的 CDW 在 I$_S$ 以下不表现出任何相移,并且在 I$_S$ 以上只能容忍相位的缓慢空间变化。这是首次在准二维体系的体相中观察到 CDW 行为,该行为使电荷在室温下的集体输运成为可能。
英文摘要:
We report on sliding Charge Density Wave (CDW) in the quasi two-dimensional TbTe$_3$ system probed by coherent x-ray diffraction combined with {\it in-situ} transport measurements. We show that the non-Ohmic conductivity in TbTe$_3$ is made possible thanks to a strong distortion of the CDW. Our diffraction experiment versus current shows first that the CDW remains undeformed below the threshold current I$_S$ and then suddenly rotates and reorders by motion above threshold. Contrary to quasi-one dimensional systems, the CDW in TbTe$_3$ does not display any phase shifts below I$_S$ and tolerates only slow spatial variations of the phase above. This is a first observation of CDW behavior in the bulk in a quasi-two dimensional system allowing collective transport of charges at room temperature.
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。