School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Proc Natl Acad Sci U S A. 2022 Oct 18;119(42):e2201279119. doi: 10.1073/pnas.2201279119. Epub 2022 Oct 10.
Broken time-reversal and parity symmetries in active spinner fluids imply a nondissipative "odd viscosity," engendering phenomena unattainable in traditional passive or active fluids. Here we show that the odd viscosity itself can lead to a Hall-like transport when the active chiral fluid flows through a quenched matrix of obstacles, reminiscent of the anomalous Hall effect. The Hall-like velocity depends significantly on the spinner activity and longitudinal flow due to the interplay between odd viscosity and spinner-obstacle collisions. Our findings underscore the importance of odd viscosity in active chiral matter and elucidate its essential role in the anomalous Hall-like effect.
在主动旋转流体中，破缺的时间反演和宇称对称性意味着存在非耗散的“奇粘滞”，从而产生传统被动或主动流体无法实现的现象。在这里，我们表明，当主动手性流体流过淬火障碍物矩阵时，奇粘滞本身会导致类似于反常霍尔效应的霍尔样输运。由于奇粘滞和旋转器-障碍物碰撞之间的相互作用，霍尔样速度会显著依赖于旋转器的活性和纵向流动。我们的发现强调了奇粘滞在主动手性物质中的重要性，并阐明了它在反常霍尔样效应中的基本作用。
