journal article·2023-10-11

Magnetic Topological Insulator MnBi2Te4 Nanosheets for Femtosecond Pulse Generation

Haiqin Deng, Yan Zhang, Xiaoxin Yang, Qiang Yu, Pengdong Wang, Zixin Yang, Yongping Dai, Xiuyang Pang, Xiao Wang, Jian Wu, Pu Zhou

ACS Applied Materials & Interfaces· Volume 15· Issue 40
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Abstract

The van der Waals layered material MnBi 2 Te 4, as a magnetic topological insulator, has attracted tremendous interest for novel physics research in the fields of condensed matter physics and materials science. However, the nonlinear optical properties of MnBi 2 Te 4 and its applications in ultrafast optics have rarely been explored. In this study, high-quality MnBi 2 Te 4 nanosheets have been successfully synthesized by the self-flux method. The morphology, chemical composition, magnetic properties, and nonlinear optical characteristics were systematically investigated. The magnetic transition of MnBi 2 Te 4 was confirmed by a low-temperature spatially resolved spectroscopic technique. The saturable absorption property of MnBi 2 Te 4 was measured by a balanced twin-detector system with a modulation depth of 4.5% and a saturation optical intensity of 2.35 GW/cm 2 . Furthermore, by inserting the MnBi 2 Te 4 -based saturable absorber, a soliton mode-locking laser operating at 1558.8 nm was obtained with a pulse duration of 331 fs. This research will pave the way for applications of the magnetic TI MnBi 2 Te 4 in nonlinear optics and photonics.
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Research context

OpenAlex topics: Advanced Fiber Laser Technologies · Laser-Matter Interactions and Applications · Diamond and Carbon-based Materials Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China

i-Lab & Key Laboratory of Nanodevices and Applications & Key Laboratory of Nanophotonic Materials and Devices, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215125, China

Institute of Technology for Carbon Neutrality, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, Guangdong, China

Vacuum Interconnected Nanotech Workstation, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS), Suzhou 215123, China

Engineering Research Center of Advanced Rare Earth Materials (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, China

Funding

Laboratory of Nano Devices and Applications, Chinese Academy of Sciences · Vacuum Interconnected Nanotech Workstation, Suzhou Institute of Nano-Tech and Nano-Bionics · Youth Innovation Promotion Association of the Chinese Academy of Sciences · National Natural Science Foundation of China · Postgraduate Scientific Research Innovation Project of Hunan Province

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