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Valley Polarization in Janus Single-Layer MoSSe via Magnetic Doping
Rui Peng1, Yandong Ma1, Shuai Zhang1
1School of Physics, State Key Laboratory of Crystal Materials , Shandong University , Shandanan Street 27 , Jinan 250100 , China.
The Journal of Physical Chemistry Letters
|June 19, 2018
Summary
Researchers achieved valley polarization in Janus MoSSe using magnetic doping, a key step for advanced valleytronics. This method offers a tunable platform for future information processing technologies.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Two-dimensional (2D) valleytronic systems offer potential advantages over conventional charge- and spin-based technologies for information storage and processing.
- A significant challenge in valleytronics is achieving valley polarization to control the valley degree of freedom.
Purpose of the Study:
- To propose and investigate the feasibility of achieving valley polarization in Janus single-layer MoSSe through magnetic doping.
- To explore the role of inversion symmetry breaking and spin-orbit coupling (SOC) in MoSSe's band structure for valley manipulation.
- To demonstrate the tunability of valley polarization via strain engineering.
Main Methods:
- Theoretical proposal of magnetic doping (Cr/V) in Janus single-layer MoSSe.
- Analysis of the electronic band structure, considering inversion symmetry breaking and strong spin-orbit coupling (SOC).
- Investigation of valley polarization generation and its energy difference.
- Exploration of strain engineering for tuning the valley polarization.
Main Results:
- Magnetic doping of Cr/V in Janus single-layer MoSSe successfully induces valley polarization.
- A significant energy difference of approximately 0.06 eV is observed upon activating SOC.
- The induced valley polarization is tunable through the application of strain.
Conclusions:
- Janus single-layer MoSSe doped with Cr/V presents a promising and experimentally feasible platform for achieving valley polarization.
- The combination of broken inversion symmetry and strong SOC in MoSSe is crucial for coupled spin and valley physics.
- This work paves the way for experimental advancements and applications in the field of valleytronics.
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