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Designing Lattice Spin Models and Magnon Gaps with Supercurrents
Johanne Bratland Tjernshaugen1, Martin Tang Bruland1, Jacob Linder1
1Norwegian University of Science and Technology, Center for Quantum Spintronics, Department of Physics, NO-7491 Trondheim, Norway.
Physical Review Letters
|March 27, 2026
Summary
Researchers demonstrate electric control of spin lattices and magnon gaps using supercurrents. This breakthrough enables tunable magnetic interactions and controlled magnon gaps without dissipative currents, advancing quantum applications.
Area of Science:
- Condensed matter physics
- Quantum information science
- Spintronics
Background:
- Electric control of magnetic interactions is crucial for quantum technologies like qubits and memory.
- Current methods often rely on dissipative currents, posing limitations.
Purpose of the Study:
- To investigate the control of spin lattices and magnon gaps using supercurrents.
- To explore novel methods for electric control of magnetic interactions without dissipation.
Main Methods:
- Theoretical modeling of spin-polarized supercurrents interacting with magnetic adatoms on superconductors.
- Analysis of spin lattice properties and magnon gap modulation in magnetic insulators.
Main Results:
- Supercurrents enable electric control over spin lattices, making interactions dependent on absolute adatom positions.
- Tunable noncollinear ground states and controlled magnon gaps in antiferromagnetic and altermagnetic insulators were achieved.
- Demonstrated spin switching and magnon gap control without dissipative currents.
Conclusions:
- Supercurrents offer a dissipationless pathway for electric control of magnetism at the quantum level.
- This provides a practical platform for studying spin Hamiltonians and developing advanced quantum devices.
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