LaAlO3 和 SrTiO3 作为钙钛矿型能带绝缘体，它们形成的LaAlO3/SrTiO3 异质界面却可以形成高迁移率的二维电子气，其二维超导电性、界面磁性、自旋轨道耦合等诸多物理性质已经被广泛研究。对于二维超导体，零温下超导-反常金属量子相变的起源仍然是一个悬而未决的问题。传统理论认为在超导-绝缘量子相变中只存在两种基态，即库珀对的超导基态和绝缘基态。然而人们在研究超导颗粒膜中超导电性的演化与厚度和温度的关系时发现，存在一个中间金属态破坏了超导体和绝缘体之间的直接过渡。这种中间金属态的标志性特征是在超导转变温度之下存在饱和的剩余电阻，与之对应的基态称作反常金属态。本文主要对在 LaAlO3/SrTiO3 (001) 异质界面磁场诱导的超导-反常金属量子相变进行了系统的研究。本文首先利用脉冲激光沉积技术，在 SrTiO3 (001) 衬底上，外延生长了高质量的LaAlO3 薄膜，然后利用稀释制冷机，测量了 LaAlO3/SrTiO3 (001) 异质界面极低温的电输运性质。在没有外加磁场的情况下，R-T 曲线和 I-V 特性曲线表明样品在超导转变温度之下处于超导态。当施加一个垂直于样品表面的小的磁场时，样品的零电阻态消失。外加磁场导致样品在低温下出现饱和电阻、正的巨磁阻效应和低电流范围内的线性 I-V 特性曲线，表明样品处于反常金属态。因此，本文在 LaAlO3/SrTiO3 (001) 体系中观察到了由磁场诱导的超导态到反常金属态转变。根据低温下电阻与磁场的标度分析和霍尔电阻的消失，我们推断在 LaAlO3/SrTiO3 (001) 体系中观察到的反常金属态是玻色金属态，并将主要观察结果总结在 H-T 相图中。研究结果表明，磁场调控的LaAlO3/SrTiO3 (001) 异质界面可以成为一个可控研究反常金属态的理想平台。

LaAlO3 and SrTiO3 are perovskite-type energy band insulators, but the LaAlO3/SrTiO3 heterointerface can form two-dimensional electron gas (2DEG) with high mobility. Since the discovery of two-dimensional electron gas with high mobility at the LaAlO3/SrTiO3 heterointerface, many physical properties such as two-dimensional superconductivity, magnetism and spin-orbit coupling have been widely studied. The origin of the quantum superconductor to metal transition at zero temperature in two-dimensional superconductor is still an open problem, which has caused intensely discussion. According to the traditional theory, there are only two ground states in the superconducting to insulating quantum phase transition, namely the superconducting state and the insulating state. However, when studying the relationship between the evolution of superconductivity in superconducting granular films and the thickness and temperature, it was found that there was an intermediate metal state that destroyed the direct transition between superconductors and insulators. The characteristic feature of this intermediate metal state is the presence of saturated residual resistance below the superconducting transition temperature, and the corresponding ground state is called an anomalous metallic state. In this paper, the electrical transport properties of LaAlO3/SrTiO3 (001) heterointerface were systematically investigated in perpendicular magnetic field at low temperature. We prepared high-quality LaAlO3 thin film on SrTiO3 (001) substrate using pulsed laser deposition. The electrical transport properties of LaAlO3/SrTiO3 (001) heterojunction at extremely low temperatures were measured using a dilution refrigerator. The R-T curves and the I-V characteristics in zero magnetic field show that LaAlO3/SrTiO3 (001) heterointerface is in the superconducting state. However, after a small magnetic field is applied, the LaAlO3/SrTiO3 (001) heterointerface has the characteristics of resistance saturation at low temperature, linear I-V characteristics, giant positive magnetoresistance, vanishing of Hall resistance, indicating the clear characteristics of an anomalous metallic state. The sample undergoes a quantum superconductor to metal transition at temperatures approaching to zero. By analyzing the relationship between the resistance of the anomalous metallic regime and the magnetic field and the vanish of Hall resistance, we infer that the anomalous metallic state observed in LaAlO3/SrTiO3 (001) heterointerface can be explained by Bose metal model. In addition, we have observed the  anomalous metallic state emerges in an exceptionally large region under the magnetic field and our key observations are summarized in the H-T phase diagram. According to our findings, the magnetic field regulated LaAlO3/SrTiO3 (001) heterointerface emerges as a privileged platform to scrutinize the details of the anomalous metallic state in a controllable way.