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The low in-plane symmetry in layered 1T'-ReS$_2$ results in strong bandanisotropy, while its manifestation in the electronic properties is challengingto resolve due to the lack of effective approaches for controlling the localcurrent path. In this work, we reveal the giant transport anisotropy inmonolayer to four-layer ReS$_2$ by creating directional conducting paths viananoscale ferroelectric control. By reversing the polarization of aferroelectric polymer top layer, we induce conductivity switching ratio of>1.5x10$^8$ in the ReS$_2$ channel at 300 K. Characterizing the domain-definedconducting nanowires in an insulating background shows that the conductivityratio between the directions along and perpendicular to the Re-chain can exceed5.5x10$^4$. Theoretical modeling points to the band origin of the transportanomaly, and further reveals the emergence of a flat band in few-layer ReS$_2$.Our work paves the path for implementing the highly anisotropic 2D materialsfor designing novel collective phenomena and electron lensing applications.

Giant Transport Anisotropy in ReS$_2$ Revealed via Nanoscale Conducting Path Control