Tungsten Ditelluride: a layered semimetal.
Identifieur interne : 000059 ( Main/Merge ); précédent : 000058; suivant : 000060Tungsten Ditelluride: a layered semimetal.
Auteurs : Chia-Hui Lee [États-Unis] ; Eduardo Cruz Silva [États-Unis] ; Lazaro Calderin [États-Unis] ; Minh An T. Nguyen [États-Unis] ; Matthew J. Hollander [États-Unis] ; Brian Bersch [États-Unis] ; Thomas E. Mallouk [États-Unis] ; Joshua A. Robinson [États-Unis]Source :
- Scientific reports [ 2045-2322 ] ; 2015.
Abstract
Tungsten ditelluride (WTe2) is a transition metal dichalcogenide (TMD) with physical and electronic properties that make it attractive for a variety of electronic applications. Although WTe2 has been studied for decades, its structure and electronic properties have only recently been correctly described. We experimentally and theoretically investigate the structure, dynamics and electronic properties of WTe2, and verify that WTe2 has its minimum energy configuration in a distorted 1T structure (Td structure), which results in metallic-like transport. Our findings unambiguously confirm the metallic nature of WTe2, introduce new information about the Raman modes of Td-WTe2, and demonstrate that Td-WTe2 is readily oxidized via environmental exposure. Finally, these findings confirm that, in its thermodynamically favored Td form, the utilization of WTe2 in electronic device architectures such as field effect transistors may need to be reevaluated.
DOI: 10.1038/srep10013
PubMed: 26066766
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<front><div type="abstract" xml:lang="en">Tungsten ditelluride (WTe2) is a transition metal dichalcogenide (TMD) with physical and electronic properties that make it attractive for a variety of electronic applications. Although WTe2 has been studied for decades, its structure and electronic properties have only recently been correctly described. We experimentally and theoretically investigate the structure, dynamics and electronic properties of WTe2, and verify that WTe2 has its minimum energy configuration in a distorted 1T structure (Td structure), which results in metallic-like transport. Our findings unambiguously confirm the metallic nature of WTe2, introduce new information about the Raman modes of Td-WTe2, and demonstrate that Td-WTe2 is readily oxidized via environmental exposure. Finally, these findings confirm that, in its thermodynamically favored Td form, the utilization of WTe2 in electronic device architectures such as field effect transistors may need to be reevaluated.</div>
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