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Observation of robust zero-energy state and enhanced superconducting gap in a trilayer heterostructure of MnTe/Bi2Te3/Fe(Te, Se).


ABSTRACT: The interface between magnetic material and superconductors has long been predicted to host unconventional superconductivity, such as spin-triplet pairing and topological nontrivial pairing state, particularly when spin-orbital coupling (SOC) is incorporated. To identify these unconventional pairing states, fabricating homogenous heterostructures that contain such various properties are preferred but often challenging. Here, we synthesized a trilayer-type van der Waals heterostructure of MnTe/Bi2Te3/Fe(Te, Se), which combined s-wave superconductivity, thickness-dependent magnetism, and strong SOC. Via low-temperature scanning tunneling microscopy, we observed robust zero-energy states with notably nontrivial properties and an enhanced superconducting gap size on single unit cell (UC) MnTe surface. In contrast, no zero-energy state was observed on 2-UC MnTe. First-principle calculations further suggest that the 1-UC MnTe has large interfacial Dzyaloshinskii-Moriya interaction and a frustrated AFM state, which could promote noncolinear spin textures. It thus provides a promising platform for exploring topological nontrivial superconductivity.

SUBMITTER: Ding S 

PROVIDER: S-EPMC9473575 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature

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Observation of robust zero-energy state and enhanced superconducting gap in a trilayer heterostructure of MnTe/Bi<sub>2</sub>Te<sub>3</sub>/Fe(Te, Se).

Ding Shuyue S   Chen Chen C   Cao Zhipeng Z   Wang Di D   Pan Yongqiang Y   Tao Ran R   Zhao Dongming D   Hu Yining Y   Jiang Tianxing T   Yan Yajun Y   Shi Zhixiang Z   Wan Xiangang X   Feng Donglai D   Zhang Tong T  

Science advances 20220914 37


The interface between magnetic material and superconductors has long been predicted to host unconventional superconductivity, such as spin-triplet pairing and topological nontrivial pairing state, particularly when spin-orbital coupling (SOC) is incorporated. To identify these unconventional pairing states, fabricating homogenous heterostructures that contain such various properties are preferred but often challenging. Here, we synthesized a trilayer-type van der Waals heterostructure of MnTe/Bi  ...[more]

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