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Intrinsic Gyrotropic Magnetic Current from Zeeman Quantum Geometry
Longjun Xiang1, Jinxiong Jia1,2, Fuming Xu1,3
1Shenzhen University, College of Physics and Optoelectronic Engineering, Shenzhen 518060, China.
Physical Review Letters
|April 7, 2025
Summary
Researchers introduce Zeeman Quantum Geometric Tensor (QGT) for spin-orbit coupled materials. This new QGT drives intrinsic gyrotropic magnetic currents (IGMC) under oscillating magnetic fields, offering new avenues for quantum material exploration.
Area of Science:
- Condensed Matter Physics
- Quantum Materials Science
Background:
- Quantum geometric tensor (QGT) is crucial for understanding quantum material properties.
- Existing QGT formalisms primarily focus on momentum, neglecting spin dynamics.
Purpose of the Study:
- To extend the concept of QGT by incorporating the electron spin degree of freedom.
- To uncover novel quantum geometric quantities and their material responses.
Main Methods:
- Revisiting and extending the definition of QGT to include spin.
- Developing the concept of Zeeman Quantum Geometric Tensor (Zeeman QGT).
- Employing symmetry analysis and model calculations to predict material responses.
Main Results:
- Uncovered Zeeman QGT, which relates momentum translation and spin rotation.
- Identified Zeeman Berry curvature and quantum metric as key components of Zeeman QGT.
- Demonstrated that Zeeman QGT can drive intrinsic gyrotropic magnetic currents (IGMC) in spin-orbit coupled materials.
Conclusions:
- Zeeman QGT offers a new framework for exploring quantum materials with spin-orbit coupling.
- Intrinsic gyrotropic magnetic currents can be induced by steering electron spins with oscillating magnetic fields.
- The study provides insights into the experimental detection of IGMC driven by Zeeman QGT.
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