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Robust Tunable Large-Gap Quantum Spin Hall States in Monolayer Cu2S on Insulating Substrates
Ali Sufyan1, Gennevieve Macam1, Zhi-Quan Huang1
1Department of Physics, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan.
ACS Omega
|May 16, 2022
Summary
Researchers discovered a novel copper sulfide (Cu₂S) material exhibiting a Quantum Spin Hall (QSH) phase with a large band gap. This material maintains its topological properties on various substrates, paving the way for new electronic devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Chemistry
Background:
- Quantum Spin Hall (QSH) insulators are crucial for low-dissipation electronics due to their unique edge states.
- Existing 2D materials often lack large band gaps or lose topological properties when placed on substrates.
Purpose of the Study:
- To investigate the electronic and topological properties of monolayer copper sulfide (Cu₂S).
- To assess the stability of the QSH phase in Cu₂S heterostructures on different substrates.
Main Methods:
- First-principles calculations using hybrid functional methods.
- Analysis of electronic band structure and topological properties.
- Construction and simulation of Cu₂S/substrate heterostructures (PtTe₂, h-BN, Cu(111)).
Main Results:
- Monolayer Cu₂S exhibits an intrinsic Quantum Spin Hall (QSH) phase with a substantial band gap of 220 meV.
- The material shows significant Rashba spin splitting, beneficial for spintronic applications.
- Topological properties of Cu₂S remain robust when interfaced with common substrates like PtTe₂, h-BN, and Cu(111).
Conclusions:
- Monolayer Cu₂S is a promising candidate for realizing inversion-asymmetric QSH insulators.
- The material's large band gap and substrate-independent topological stability make it suitable for room-temperature applications.
- Cu₂S offers a potential platform for developing advanced low-dissipation electronic devices.
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