Twist-driven wide freedom of indirect interlayer exciton emission in MoS2/WS2 heterobilayers

Mike Tebyetekerwa; Jian Zhang; Sandra Elizabeth Saji; Ary Anggara Wibowo; Sharidya Rahman; Thien N. Truong; Yuerui Lu; Zongyou Yin; Daniel Macdonald; Hieu T. Nguyen

Cell Reports Physical Science (Aug 2021)

Twist-driven wide freedom of indirect interlayer exciton emission in MoS2/WS2 heterobilayers

Mike Tebyetekerwa,
Jian Zhang,
Sandra Elizabeth Saji,
Ary Anggara Wibowo,
Sharidya Rahman,
Thien N. Truong,
Yuerui Lu,
Zongyou Yin,
Daniel Macdonald,
Hieu T. Nguyen

Affiliations

Mike Tebyetekerwa: School of Engineering, College of Engineering and Computer Science, The Australian National University, Canberra, ACT 2601, Australia; Corresponding author
Jian Zhang: Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, People’s Republic of China
Sandra Elizabeth Saji: Research School of Chemistry, College of Science, The Australian National University, Canberra, ACT 2601, Australia
Ary Anggara Wibowo: School of Engineering, College of Engineering and Computer Science, The Australian National University, Canberra, ACT 2601, Australia
Sharidya Rahman: School of Engineering, College of Engineering and Computer Science, The Australian National University, Canberra, ACT 2601, Australia
Thien N. Truong: School of Engineering, College of Engineering and Computer Science, The Australian National University, Canberra, ACT 2601, Australia
Yuerui Lu: School of Engineering, College of Engineering and Computer Science, The Australian National University, Canberra, ACT 2601, Australia
Zongyou Yin: Research School of Chemistry, College of Science, The Australian National University, Canberra, ACT 2601, Australia
Daniel Macdonald: School of Engineering, College of Engineering and Computer Science, The Australian National University, Canberra, ACT 2601, Australia
Hieu T. Nguyen: School of Engineering, College of Engineering and Computer Science, The Australian National University, Canberra, ACT 2601, Australia; Corresponding author

Journal volume & issue: Vol. 2, no. 8
p. 100509

Abstract

Read online

Summary: Theoretical and first-principal studies involving twisted two-dimensional (2D) heterobilayer transition metal dichalcogenides (TMDs) predict interlayer exciton (ILE) emission energy amplitudes (the energy difference between the lowest and the highest ILE emission energies) in the range of 100–260 meV. This can be translated into an interfacial exciton periodic potential modulation depth of 100–260 meV. However, experimental studies on twisted TMD heterobilayers have reported only a narrow depth of ILE emission of up to ∼70 meV. Here, we report a wide degree of freedom twist-angle-driven indirect ILE emission in chemical vapor deposition (CVD)-grown MoS2/WS2 vertical heterobilayers (up to ∼10%, amplitude of 120 ± 30 meV). This is attributed to the close interlayer spacing between MoS2 and WS2 courtesy of their similar hexagonal crystal symmetry with an almost similar size, coupled with interlayer spacing tuneability at various twist angles. The wide degree of freedom of ILE emission opens exciting avenues for exploring intriguing phenomena in tuneable twistronics.

Published in Cell Reports Physical Science

ISSN: 2666-3864 (Online)
Publisher: Elsevier
Country of publisher: United States
LCC subjects: Science: Physics
Website: https://www.cell.com/cell-reports-physical-science

About the journal

Abstract

Keywords