Coherent Electronic Band Structure of TiTe 2 /TiSe 2 Moiré Bilayer

A van der Waals bonded moiré bilayer formed by sequential growth of TiSe and TiTe monolayers exhibits emergent electronic structure as evidenced by angle-resolved photoemission band mapping. The two monolayers adopt the same lattice orientation but incommensurate lattice constants. Despite the lack...

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Bibliographic Details
Published in:	ACS nano 2021-02, Vol.15 (2), p.3359-3364
Main Authors:	Lin, Meng-Kai, He, Tao, Hlevyack, Joseph A, Chen, Peng, Mo, Sung-Kwan, Chou, Mei-Yin, Chiang, T-C
Format:	Article
Language:	eng
Subjects:	emergent band structure heterostructure INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY moiré bilayer transition metal dichalcogenides ultrathin film
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Summary:	A van der Waals bonded moiré bilayer formed by sequential growth of TiSe and TiTe monolayers exhibits emergent electronic structure as evidenced by angle-resolved photoemission band mapping. The two monolayers adopt the same lattice orientation but incommensurate lattice constants. Despite the lack of translational symmetry, sharp dispersive bands are observed. The dispersion relations appear distinct from those for the component monolayers alone. Theoretical calculations illustrate the formation of composite bands by coherent electronic coupling despite the weak interlayer bonding, which leads to band renormalization and energy shifts.
ISSN:	1936-0851 1936-086X