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Giant Rashba splitting in PtTe/PtTe2 heterostructure.
Runfa Feng1, Yang Zhang1, Jiaheng Li1
1State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, PR China.
Nature Communications
|March 19, 2025
Summary
Researchers created a novel PtTe/PtTe2 heterostructure from a centrosymmetric material, achieving significant Rashba spin splitting. This breakthrough enhances the potential of transition metal dichalcogenides for spintronic applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Spintronics
Background:
- Achieving large spin splitting is crucial for spintronic devices, but many atomically thin films lack inversion symmetry.
- Centrosymmetric transition metal dichalcogenides (TMDCs) are generally unsuitable for spintronic applications due to their symmetry.
Purpose of the Study:
- To develop a strategy for breaking inversion symmetry in centrosymmetric TMDCs.
- To induce and investigate giant Rashba spin splitting in PtTe2-based heterostructures.
- To explore the potential of TMMC/TMDC heterostructures for spintronics.
Main Methods:
- Utilized thermal annealing to induce tellurium extraction from a PtTe2 bilayer.
- Formed a naturally occurring PtTe/PtTe2 heterostructure.
- Employed spin- and angle-resolved photoemission spectroscopy (SARPES) to probe electronic structure and spin polarization.
Main Results:
- Successfully broke the inversion symmetry of the centrosymmetric PtTe2 bilayer.
- Observed a giant Rashba spin splitting in the PtTe/PtTe2 heterostructure.
- Quantified the Rashba coefficient as αR = 1.8 eV·Å via SARPES measurements.
Conclusions:
- Demonstrated a facile method to create inversion symmetry breaking in centrosymmetric TMDCs.
- The PtTe/PtTe2 heterostructure exhibits significant potential for spintronic applications.
- This approach offers a viable pathway for utilizing TMDCs in advanced electronic devices.
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