Coherent Electronic Band Structure of TiTe2/TiSe2 Moiré Bilayer

Lin, Meng-Kai; He, Tao; Hlevyack, Joseph A.; Chen, Peng; Mo, Sung-Kwan; Chou, Mei-Yin; Chiang, T. -C.

doi:10.1021/acsnano.0c10352

Title: Coherent Electronic Band Structure of TiTe₂/TiSe₂ Moiré Bilayer

Journal Article · 10 February 2021 · ACS Nano

DOI: https://doi.org/10.1021/acsnano.0c10352 · OSTI ID:1822863

^[1]; He, Tao ^[2]; Hlevyack, Joseph A. ^[1]; Chen, Peng ^[3];

^[4];

^[5]; Chiang, T. -C. ^[1]

Univ. of Illinois at Urbana-Champaign, IL (United States)
Academia Sinica, Taipei (Taiwan)
Shanghai Jiao Tong Univ. (China)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Academia Sinica, Taipei (Taiwan); National Taiwan Univ., Taipei (Taiwan)

Here, a van der Waals bonded moiré bilayer formed by sequential growth of TiSe₂ and TiTe₂ 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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231; FG02-07ER46383

OSTI ID:: 1822863

Journal Information:: ACS Nano, Journal Name: ACS Nano Journal Issue: 2 Vol. 15; ISSN 1936-0851

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
emergent band structure
heterostructure
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Title: Coherent Electronic Band Structure of TiTe2/TiSe2 Moiré Bilayer

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Title: Coherent Electronic Band Structure of TiTe₂/TiSe₂ Moiré Bilayer