Photoinduced Topological Phase Transitions in Topological Magnon Insulators

Area of Science:

• Condensed Matter Physics
• Quantum Materials
• Spintronics

Background:

• Topological magnon insulators are bosonic analogs of electronic topological insulators, exhibiting protected edge modes.
• These materials, like the kagomé ferromagnet Cu(1-3, bdc), transport heat and spin currents, offering spintronic potential.
• Magnons, as charge-neutral spin-1 bosons, interact with electromagnetic fields via the Aharonov-Casher effect.

Purpose of the Study:

• Investigate photoinduced topological phase transitions in intrinsic topological magnon insulators.
• Explore the manipulation of topological magnetic materials using light.
• Examine the potential for creating novel topological states and semimetals.

Main Methods:

• Application of magnonic Floquet-Bloch theory.
• Analysis of periodically driven kagomé ferromagnets under varying light intensity.
• Theoretical modeling of topological phase transitions.

Main Results:

• Light intensity can tune topological magnetic materials into different topological phases.
• Berry curvatures and thermal Hall conductivity signs can be controlled by light.
• Gapped topological magnon insulators can be driven into synthetic gapless topological magnon semimetals with Dirac-Weyl magnon cones.

Conclusions:

• Photoinduced topological phase transitions offer a pathway to control topological states in magnetic materials.
• This work opens avenues for practical applications in topological spintronics.
• The ability to create synthetic topological semimetals highlights the tunability of these systems.