December 1 - 6, 2024
Boston, Massachusetts
Symposium Supporters
2024 MRS Fall Meeting & Exhibit
NM05.01.01

A Metastable Pentagonal 2D Material Synthesized by Symmetry-Driven Epitaxy

When and Where

Dec 1, 2024
8:00am - 8:15am
Hynes, Level 2, Room 207

Presenter(s)

Co-Author(s)

Lina Liu1,2,Yujin Ji3,Marco Bianchi2,Saban Hus4,Zheshen Li2,Richard Balog2,Jill Miwa2,Philip Hoffman2,An-Ping Li4,Dmitry Zemlyanov1,Youyong Li3,Yong Chen1,2

Purdue University1,Aarhus University2,Soochow University3,Oak Ridge National Laboratory4

Abstract

Lina Liu1,2,Yujin Ji3,Marco Bianchi2,Saban Hus4,Zheshen Li2,Richard Balog2,Jill Miwa2,Philip Hoffman2,An-Ping Li4,Dmitry Zemlyanov1,Youyong Li3,Yong Chen1,2

Purdue University1,Aarhus University2,Soochow University3,Oak Ridge National Laboratory4
Most two-dimensional (2D) materials experimentally studied so far have hexagons as their building blocks. Only a few exceptions, such as PdSe<sub>2</sub>, 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 we report the successful synthesis of a metastable pentagonal 2D material, monolayer pentagonal PdTe<sub>2</sub>, 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 PdTe<sub>2</sub> 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.

Keywords

2D materials | scanning tunneling microscopy (STM) | vapor phase epitaxy (VPE)

Symposium Organizers

Andras Kis, Ecole Polytechnique Federale de Lausanne
Li Lain-Jong, University of Hong Kong
Ying Wang, University of Wisconsin, Madison
Hanyu Zhu, Rice University

Session Chairs

Zhiyuan Zeng
Hanyu Zhu

In this Session