Journal
ADVANCED MATERIALS
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202309356
Keywords
charge density wave; quantum phase transition; quantum spin Hall insulator; topological excitonic insulator; tungsten ditelluride (WTe2) monolayer
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Atomic monolayers of tungsten ditelluride (WTe2) exhibit a 2D topological excitonic insulator state, and the 2D bulk energy gap can be tuned by gate voltage, providing a novel way to control non-trivial 2D superconductivity with excitonic pairing.
Coulomb interactions among electrons and holes in 2D semimetals with overlapping valence and conduction bands can give rise to a correlated insulating ground state via exciton formation and condensation. One candidate material in which such excitonic state uniquely combines with non-trivial band topology are atomic monolayers of tungsten ditelluride (WTe2), in which a 2D topological excitonic insulator (2D TEI) forms. However, the detailed mechanism of the 2D bulk gap formation in WTe2, in particular with regard to the role of Coulomb interactions, has remained a subject of ongoing debate. Here, it shows that WTe2 is susceptible to a gate-tunable quantum phase transition, evident from an abrupt collapse of its 2D bulk energy gap upon ambipolar field-effect doping. Such gate tunability of a 2D TEI, into either n- and p-type semimetals, promises novel handles of control over non-trivial 2D superconductivity with excitonic pairing.
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