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Orbital Rashba Effect as a Platform for Robust Orbital Photocurrents
T Adamantopoulos1,2, M Merte1,2,3, D Go1,3
1Peter Grünberg Institut, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany.
Physical Review Letters
|March 1, 2024
Summary
Laser pulses generate robust orbital currents in materials lacking inversion symmetry via the orbital Rashba effect. This research advances optical generation of angular momentum currents for potential applications.
Area of Science:
- Condensed Matter Physics
- Magnetotransport Phenomena
- Optoelectronics
Background:
- Orbital current is a significant concept in magnetotransport.
- Broken inversion symmetry is crucial for observing novel electronic phenomena.
Purpose of the Study:
- To demonstrate laser-induced generation of orbital currents.
- To explore the role of the orbital Rashba effect in photocurrent generation.
- To investigate the link between orbital and spin currents.
Main Methods:
- Utilized laser pulses for current generation.
- Employed model and first-principles calculations.
- Investigated systems with broken inversion symmetry due to the orbital Rashba effect.
Main Results:
- Generated large and robust nonrelativistic orbital currents using laser pulses.
- Orbital Rashba effect and crystal field splitting mediate photocurrents without spin-orbit interaction.
- Nonrelativistic orbital photocurrents translate to spin photocurrents under relativistic effects.
Conclusions:
- Orbital photocurrents offer a promising route for optical angular momentum current generation.
- The findings pave the way for new applications in spintronics and optoelectronics.
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