Anomalous metallic behavior, marked by a saturating finite resistivity much lower than the Drude estimate, has been observed in a wide range of two-dimensional superconductors. Utilizing the electrostatically gated LaAlO₃/SrTiO₃ interface as a versatile platform for superconductor-metal quantum phase transitions, we probe variations in the gate, magnetic field, and temperature to construct a phase diagram crossing from superconductor, anomalous metal, vortex liquid, to the Drude metal state, combining longitudinal and Hall resistivity measurements. We find that the anomalous metal phases induced by gating and magnetic field, although differing in symmetry, are connected in the phase diagram and exhibit similar magnetic field response approaching zero temperature. Namely, within a finite regime of the anomalous metal state, the longitudinal resistivity linearly depends on the field while the Hall resistivity diminishes, indicating an emergent particle-hole symmetry. The universal behavior highlights the uniqueness of the quantum bosonic metallic state, distinct from bosonic insulators and vortex liquids.

在广泛的二维超导体中都观察到异常的金属行为，其饱和的有限电阻率远低于Drude的估计值。利用静电选通的LaAlO ₃ / SrTiO ₃作为超导体-金属量子相变的通用平台的接口，我们探测栅极，磁场和温度的变化，以构建从超导体，异常金属，涡旋液体到Drude金属态的相图，并结合纵向和霍尔电阻率测量。我们发现，尽管对称性不同，但由门控和磁场引起的异常金属相在相图中连接在一起，并且在接近零温度时表现出相似的磁场响应。即，在异常金属状态的有限范围内，当霍尔电阻率减小时，纵向电阻率线性地取决于场，这表明出现了粒子-孔的对称性。普遍行为突出了量子玻色子金属态的独特性，