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MA: Fachverband Magnetismus
MA 25: Focus Session: Chiral phonons and crystals coupled to magnetic order I
MA 25.1: Hauptvortrag
Mittwoch, 11. März 2026, 09:30–10:00, HSZ/0002
Coherent phononic control of chirality — •Michael Först — Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany
Chirality is a pervasive property of matter that underpins many important phenomena across physics, chemistry and biology. Given its broad significance, the development of protocols for rational control of chirality in solid state systems is highly desirable, especially if this effect can be tuned continuously and in two directions.
I will show that coherent optical excitation of the crystal lattice at terahertz frequencies can induce chirality in the non-chiral solid BPO4. By resonantly driving one of two orthogonal, doubly degenerate phonon modes and exploiting their nonlinear coupling to symmetry-lowering lattice distortions, chiral structures of either handedness can be selectively created. These findings offer new prospects for controlling of out-of-equilibrium phenomena in complex materials.
Keywords: non-equilibrium chirality; nonlinear phononics