A metastable pentagonal 2D material synthesized by symmetry-driven epitaxy

Liu, Lina; Ji, Yujin; Bianchi, Marco; Hus, Saban M.; Li, Zheshen; Balog, Richard; Miwa, Jill A.; Hofmann, Philip; Li, An-Ping; Zemlyanov, Dmitry Y.; Li, Youyong; Chen, Yong P.

doi:10.1038/s41563-024-01987-w

A metastable pentagonal 2D material synthesized by symmetry-driven epitaxy

Journal Article · Tue Aug 27 00:00:00 EDT 2024 · Nature Materials

DOI:https://doi.org/10.1038/s41563-024-01987-w· OSTI ID:2583773

^[1]; ^[2]; Bianchi, Marco ^[3]; ^[4]; ^[3]; ^[3]; Miwa, Jill A. ^[3]; ^[3]; ^[4]; ^[5]; ^[2]; ^[1]

Purdue Univ., West Lafayette, IN (United States); Aarhus Univ. (Denmark)
Soochow University, Suzhou (China)
Aarhus Univ. (Denmark)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Purdue Univ., West Lafayette, IN (United States)

Most two-dimensional (2D) materials experimentally studied so far have hexagons as their building blocks. Only a few exceptions, such as PdSe₂, are lower in energy in pentagonal phases and exhibit pentagons as building blocks. Although theory has predicted a large number of pentagonal 2D materials, many of these are metastable and their experimental realization is difficult. Here, in this paper, we report the successful synthesis of a metastable pentagonal 2D material, monolayer pentagonal PdTe₂, by symmetry-driven epitaxy. Scanning tunnelling microscopy and complementary spectroscopy measurements are used to characterize this material, which demonstrates well-ordered low-symmetry atomic arrangements and is stabilized by lattice matching with the underlying Pd(100) substrate. Theoretical calculations, along with angle-resolved photoemission spectroscopy, reveal monolayer pentagonal PdTe₂ to be a semiconductor with an indirect bandgap of 1.05 eV. Our work opens an avenue for the synthesis of pentagon-based 2D materials and gives opportunities to explore their applications such as multifunctional nanoelectronics.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

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

Grant/Contract Number:: AC05-00OR22725; SC0019215

OSTI ID:: 2583773

Journal Information:: Nature Materials, Journal Name: Nature Materials Journal Issue: 10 Vol. 23; ISSN 1476-4660; ISSN 1476-1122

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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