The topological quantum phases in antiferromagnetic topological insulator MnBi_(2)Te_(4)hold promise for next-generation spintronics,but their experimental realization has been constrained by challenges in preparing h...The topological quantum phases in antiferromagnetic topological insulator MnBi_(2)Te_(4)hold promise for next-generation spintronics,but their experimental realization has been constrained by challenges in preparing high-quality devices.In this work,we report a new wax-assisted exfoliation and transfer method that enables the fabrication of MnBi_(2)Te_(4)heterostructures with both surfaces encapsulated by AlO_(x).This strategy strongly enhances the transport performances of the topological quantum phases in MnBi_(2)Te_(4)flakes,which is attributed to the enhancement of magnetism by the AlO_(x)layer.We observe the robust axion insulator state in even-layer device with wide zero Hall plateau and high longitudinal resistivity,and the quantum anomalous Hall effect in odd-layer device with large hysteresis and sharp plateau transition.These results demonstrate that the combination of wax exfoliation and AlO_(x)encapsulation provides great potentials for exploring novel topological quantum phenomena and potential applications in MnBi2Te4 and other two-dimensional materials.展开更多
基金supported by the Basic Science Center Project of the National Natural Science Foundation of China(52388201 and 12274453)the Innovation program for Quantum Science and Technology(2021ZD0302502 and 2021ZD0302502)+1 种基金the Beijing Nova Program(20240484574)the New Cornerstone Science Foundation through the New Cornerstone Investigator Program.
文摘The topological quantum phases in antiferromagnetic topological insulator MnBi_(2)Te_(4)hold promise for next-generation spintronics,but their experimental realization has been constrained by challenges in preparing high-quality devices.In this work,we report a new wax-assisted exfoliation and transfer method that enables the fabrication of MnBi_(2)Te_(4)heterostructures with both surfaces encapsulated by AlO_(x).This strategy strongly enhances the transport performances of the topological quantum phases in MnBi_(2)Te_(4)flakes,which is attributed to the enhancement of magnetism by the AlO_(x)layer.We observe the robust axion insulator state in even-layer device with wide zero Hall plateau and high longitudinal resistivity,and the quantum anomalous Hall effect in odd-layer device with large hysteresis and sharp plateau transition.These results demonstrate that the combination of wax exfoliation and AlO_(x)encapsulation provides great potentials for exploring novel topological quantum phenomena and potential applications in MnBi2Te4 and other two-dimensional materials.
