Journal
PHYSICAL REVIEW B
Volume 104, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.L241408
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Experimental evidence of a 2DTI in the van der Waals material Ta2Pd3Te5 has been reported, showing that each monolayer is a 2DTI with weak interlayer interactions. Measurements confirm the existence of a band gap at the Fermi level and topological edge states inside the gap, making Ta2Pd3Te5 a promising material for fabricating spintronic devices based on the QSH effect.
Two-dimensional topological insulators (2DTIs), which host the quantum spin Hall (QSH) effect, are one of the key materials in next-generation spintronic devices. To date, experimental evidence of the QSH effect has only been observed in a few materials, and thus, the search for new 2DTIs is at the forefront of physical and materials science. Here, we report experimental evidence of a 2DTI in the van der Waals material Ta2Pd3Te5. First-principles calculations show that each monolayer of Ta2Pd3Te5 is a 2DTI with weak interlayer interactions. Combined transport, angle-resolved photoemission spectroscopy, and scanning tunneling microscopy measurements confirm the existence of a band gap at the Fermi level and topological edge states inside the gap. These results demonstrate that Ta2Pd3Te5 is a promising material for fabricating spintronic devices based on the QSH effect.
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