发表机构
Saha Institute of Nuclear Physics; Homi Bhabha National Institute; SPEC, CEA, CNRS, Université Paris-Saclay; Department of Physics and Astronomy, Purdue University; Department of Physical Sciences, IISER Kolkata; Department of Condensed Matter Physics, Weizmann Institute of Science（萨哈核物理研究所; 霍米·巴巴国立研究所; SPEC, 法国原子能和替代能源委员会, 法国国家科学研究中心, 巴黎萨克雷大学; 普渡大学物理与天文学系; 加尔各答印度科学与教育研究院物理科学系; 魏茨曼科学研究所凝聚态物理系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文通过测量可压缩量子霍尔流体的透射电导，发现其总和普适地趋于霍尔电导，确立了手性金属相的导律，并理论上解释了强磁场下时间反演对称性破缺导致的手性输运机制。
AI 中文摘要
我们报告了在填充因子为$\ u$的可压缩量子霍尔流体中，连接至无反射接触的源极之间的透射电导测量结果。我们观察到透射电导的总和普适地趋于霍尔电导$\ u(e^2/h)$。该求和规则的普适性已在整数和分数量子霍尔区域通过实验确立，并且在温度、样品几何形状、材料质量和准粒子相互作用的变化下保持不变。通过浮置接触测量，确认了可压缩量子霍尔流体中的手性输运，其特征为具有明显手性的抑制耗散输运。因此，该求和规则作为手性金属相的导电定律出现。理论上，我们认为在强磁场下，这种手性金属内的时间反演对称性破缺，在具有点状无序势的近乎平坦的势能景观中，导致了载流子的单向轨迹，这一状态在屏蔽长度小于磁长度时实现。在这种手性框架内，纵向电阻并非源于体耗散，而主要源于接触处电化学势的平衡。我们的研究为一大类具有短程屏蔽和破缺时间反演对称性的无间隙二维系统引入了手性输运的新范式。
英文摘要
We report transmitted conductance measurements between a source and reflection-less contacts connected to a compressible quantum Hall fluid with filling fraction $ν$. We observe that total sum of transmitted conductances universally approaches Hall conductance $ν(e^2/h)$. The universality of this sum rule is established experimentally across integer and fractional quantum Hall regimes, remaining invariant under variation in temperatures, sample geometries, material qualities and quasi-particle interactions. Chiral transport in compressible quantum Hall fluids, characterized by suppressed dissipative transport with a distinct handedness, is confirmed by floating contact measurements. Consequently, this sum rule emerges as a conduction law of the chiral metal phase. Theoretically, we argue that time-reversal-symmetry breaking under a strong magnetic field within this chiral metal gives rise unidirectional trajectories of carriers in a nearly flat potential landscape with point-like disorder potentials, a regime realized when the screening length is smaller than the magnetic length. Within this chiral framework, longitudinal resistance does not originate from bulk dissipation but primarily from the equilibration of electrochemical potentials at the contacts. Our study introduces a new paradigm of chiral transport across a broad class of gapless two-dimensional systems characterized by short-range screening and broken time-reversal symmetry.
