Modulation of quantum geometry and its coupling to pseudo-electric field by dynamic strain

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Geometry

Background:

• Two-dimensional materials exhibit quantum geometric phenomena like Berry curvature and Berry curvature dipole.
• These properties govern electronic transport, leading to anomalous and nonlinear Hall effects.
• Current control methods rely on static electric fields or strain, limiting real-time applications.

Purpose of the Study:

• To explore the dynamic modulation of quantum geometric quantities in real-time.
• To investigate the coupling between pseudo-electric fields and quantum geometry.
• To establish a new pathway for on-demand control of quantum geometry.

Main Methods:

• Placing heterostructures on a membrane to introduce oscillatory strain.
• Applying an in-plane alternating current (AC) electric field.
• Measuring Hall signals modulated at combined frequencies of strain and electric field.

Main Results:

• Demonstrated dynamic modulation of Berry curvature and its moments.
• Observed coupling between pseudo-electric fields and quantum geometry.
• Provided experimental and theoretical evidence for dynamic strain-induced Hall response.

Conclusions:

• Dynamic modulation of quantum geometry is achievable using combined AC electric fields and oscillatory strain.
• This approach offers a novel method for controlling quantum geometric properties beyond static perturbations.
• The coupling mechanism opens avenues for electric field-free anomalous Hall response and probing topological properties.