The atomic structure of quasi one-dimensional (1D) van der Waals materials can be regarded as the stacking of atomic chains to form thin flakes or nanoribbons, which substantially differentiates them from typical two-dimensional (2D) layered materials and 1D nanotube/nanowire array. Here we present our studies on quasi 1D gold selenide (AuSe) that possesses highly anisotropic crystal structure, excellent electrical conductivity, giant magnetoresistance, and unusual reentrant metallic behavior. The low in-plane symmetry of AuSe gives rise to its high anisotropy of vibrational behavior. In contrast, quasi 1D AuSe exhibits high in-plane electrical conductivity along the directions of both atomic chains and perpendicular one, which can be understood as a result of strong interchain interaction. We found that AuSe exhibits a near quadratic nonsaturating giant magnetoresistance of 1841% with the magnetic field perpendicular to its in-plane. We also observe unusual reentrant metallic behavior, which is caused by the carrier mismatch in the multiband transport. Our works help to establish fundamental understandings on quasi 1D van der Waals semimetallic AuSe and identify it as a new candidate for exploring giant magnetoresistance and compensated semimetals.

准一维（1D）范德华材料的原子结构可以看作是原子链的堆叠，形成了薄片或纳米带，这使它们与典型的二维（2D）层状材料和一维纳米管/纳米线有显着区别数组。在这里，我们介绍对准一维硒化金（AuSe）的研究，该硒化金具有高度各向异性的晶体结构，出色的导电性，巨大的磁阻和异常的重入金属行为。AuSe的低面内对称性引起其高的振动行为各向异性。相反，准一维AuSe沿原子链和垂直原子链的方向都具有较高的面内电导率，这可以理解为强链间相互作用的结果。我们发现，AuSe的磁场垂直于其平面内，表现出接近二次方的非饱和巨型磁阻1841％。我们还观察到异常的重入金属行为，这是由多频带传输中的载波失配引起的。我们的工作有助于建立对准一维范德华半金属AuSe的基本理解，并将其确定为探索巨型磁阻和补偿半金属的新候选人。