Room temperature quantum metric effect in TbMn₆Sn₆

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Materials

Background:

• Quantum geometry, including Berry curvature and quantum metric, is crucial for understanding topological materials.
• Nonlinear responses in topological materials are key for nonlinear electronic devices.
• Previous studies on quantum geometry effects were limited to cryogenic temperatures.

Purpose of the Study:

• To investigate tuneable room-temperature nonlinear transport responses governed by quantum geometry.
• To explore the potential of quantum magnets for practical device applications.
• To demonstrate the tunability of quantum geometry effects via external stimuli.

Main Methods:

• Studied nonlinear transport responses in the quantum magnet TbMn6Sn6.
• Investigated the influence of magnetic fields on magnetic configurations and symmetry breaking phases.
• Analyzed the relationship between magnetic structure, symmetry, and quantum geometry effects.

Main Results:

• Reported a tuneable, strong room-temperature second-harmonic transport response in TbMn6Sn6.
• Demonstrated that magnetic fields can control magnetic configurations and symmetry breaking phases near room temperature.
• Showcased the governance of the observed response by the quantum metric.

Conclusions:

• Manipulation of magnetic structure symmetries offers an effective route for tuneable quantum-geometry-based devices.
• Room-temperature operation of quantum geometry effects is achievable in quantum magnets.
• TbMn6Sn6 is a promising material for practical nonlinear electronic devices leveraging quantum geometry.