Journal
PHYSICAL REVIEW B
Volume 102, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.102.075431
Keywords
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Funding
- National Natural Science Foundation of China [11722433, 11904142, 21873017, 21573037]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX20_2226]
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The design of two-dimensional superconductors has attracted great research interest owing to their wide application in nanoscale devices. Here, we combine first-principles calculations with structure searching technology to identify a unique stable hexagonal h-MnB3 monolayer, exhibiting a slightly higher energy with respect to the reported tetragonal t-MnB3. Interestingly, h-MnB3 contains two boron kagome layers sandwiched with Mn atoms. It exhibits metallic properties and has a superconducting transition temperature of 24.9 K, which is much higher than 2.9 K in t-MnB3. Its superconductivity mainly originates from the coupling between in-plane vibrational phonons of boron kagome layers and electrons of Mn atoms. h-MnB3 exhibits a tunable superconductivity, and reaches a maximum of 34 K at 2% tensile strain resulting from the softening in-plane modes of boron kagome layers. The Si (111) surface may be an ideal substrate for the growth of superconductive h-MnB3. The unique superconducting mechanism observed here could inspire the searching of more boron kagome based two-dimensional superconductors.
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