Project description
Harnessing orbital angular momentum for next-generation electronics
Spin angular momentum (S) of electrons has advanced electronics by adding spintronic features like magnetisation switching and detection on the femtosecond scale. The orbital angular momentum (L) of electrons could be a way to further enhance spintronics. The ERC-funded ORBITERA project aims to understand L dynamics using femtosecond optical pulses and terahertz electric fields. Researchers will work on separating L and S effects, building ultrafast L current generators and detectors, and exploring how L interacts with crystal lattices. By establishing THz orbitronics, ORBITERA will introduce new methods and applications that could benefit the wider scientific community beyond specialised labs.
Objective
The spin angular momentum (S) of the electron has significantly extended conventional electronics, which relies on the electron charge (C), by new, so-called spintronic functionalities. Examples include magnetization switching, the transport of S and its detection, even down to femtosecond time scales. To boost the efficiency of spintronics, the so far neglected yet equally fascinating and important orbital angular momentum (L) of electrons is considered to be a powerful pathway. Orbitronic phenomena such as L-based transport, torques and magneto-optic effects have much larger magnitude than their S counterparts and may, thus, efficiently complement or even replace spintronic functionalities. Microscopically, L is completely different from S. Its dynamics involves new physics that needs to be understood, in particular on ultrafast time scales.
In the ORBITERA project, my team and I will obtain unprecedented insights into L dynamics by using femtosecond optical pulses and terahertz (THz) electric fields, which couple directly to the motion of conduction electrons at their natural frequencies and relaxation rates. We will tackle important challenges of general orbitronics and, in particular, separate L- and S-based effects despite their identical macroscopic symmetry properties, build ultrafast generators and detectors of exclusively L currents, reveal the nature of L transport (e.g. ballistic, diffusive, tunneling), measure the magnetic moments forming an L current, probe the interaction of L with the crystal lattice, temporally resolve L-S and L-C interconversion, and apply THz L torque to ultimately switch magnetic order ultrafast.
By establishing THz orbitronics, new methodology (such as ultrafast drivers of L currents and L-conductance spectroscopy at 0.1-50 THz) and applications (such as the detection of THz electric fields without relying on the weak spin-orbit coupling) will be developed that can be used by a community beyond specialized THz labs.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences physical sciences electromagnetism and electronics spintronics
- natural sciences physical sciences optics spectroscopy
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Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
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HORIZON.1.1 - European Research Council (ERC)
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(opens in new window) ERC-2023-ADG
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14195 Berlin
Germany
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