arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1807.10705hep-thcond-mat.otherphysics.optics
收藏

零涡效应

The Zilch Vortical Effect

M. N. Chernodub, Alberto Cortijo, Karl Landsteiner

摘要:

研究了在有限温度下旋转光子气体中是否产生螺旋度输运电流的问题。一个问题是,没有规范不变的螺旋度或螺旋度流的局部概念。我们绕过这一点,不仅研究光学螺旋电流,但规范不变的“零”电流。为了避免因果关系的问题,我们将系统简化到有限半径的圆柱上,然后讨论无限半径的极限。我们发现,净螺旋和zilch电流只产生在有限半径的情况下,是由于对偶违反边界条件。在高温极限下,旋转轴上的电流密度存在一个普遍的结果。对于最低阶的角速度,它采取类似于众所周知的手征费米子的手征涡旋效应的温度依赖性的形式。我们简要地讨论可能的关系,重力异常。

英文摘要:

We study the question if a helicity transporting current is generated in a rotating photon gas at finite temperature. One problem is that there is no gauge invariant local notion of helicity or helicity current. We circumvent this by studying not only the optical helicity current but also the gauge-invariant "zilch" current. In order to avoid problems of causality, we quantize the system on a cylinder of a finite radius and then discuss the limit of infinite radius. We find that net helicity- and zilch currents are only generated in the case of the finite radius and are due to duality violating boundary conditions. A universal result exists for the current density on the axes of rotation in the high-temperature limit. To lowest order in the angular velocity, it takes a form similar to the well-known temperature dependence of the chiral vortical effect for chiral fermions. We briefly discuss possible relations to gravitational anomalies.

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。

↑