Two-dimensional THz spectroscopy of nonlinear phononics in the topological insulator ${\mathrm{MnBi}}_2{\mathrm{Te}}_4$

Abstract

The interaction of a single-cycle THz electric field with the topological insulator ${\mathrm{MnBi}}_2{\mathrm{Te}}_4$ triggers strongly anharmonic lattice dynamics, promoting fully coherent energy transfer between the otherwise non-interacting Raman-active $E_g$ and infrared (IR)-active $E_u$ phononic modes. Two-dimensional (2D) THz spectroscopy combined with modeling based on the classical equations of motion and symmetry analysis reveals the multi-stage process underlying the excitation of the Raman-active $E_g$ phonon. In this process, the THz electric field first prepares a coherent IR-active $E_u$ phononic state and subsequently interacts with this state to efficiently excite the $E_g$ phonon.

arXiv comment27 pages, 20 figures

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• Impulsive Fermi magnon-phonon resonance in antiferromagnetic $Co{F}_2$
• Multidimensional Terahertz Probes of Quantum Materials
• Multi-Dimensional Coherent Spectroscopy of Light-Driven States and their Collective Modes in Multi-Band Superconductors
• Squeezed Josephson plasmons in driven YBa${}_2$Cu${}_3$O${}_{6+x}$
• Discovery of an Unconventional Quantum Echo by Interference of Higgs Coherence
• Time-domain study of coupled collective excitations in quantum materials
• Excitation-Dependent Features and Artifacts in 2-D Terahertz Spectroscopy
• Unlocking Quantum Control and Multi-Order Correlations via Terahertz Two-Dimensional Coherent Spectroscopy
• Amplitude mode in a multi-gap superconductor MgB${}_2$ investigated by terahertz two-dimensional coherent spectroscopy
• Competition between terahertz magnetoelectric and Néel spin-orbit torque driven spin dynamics in metallic antiferromagnets
• Optical control of the crystal structure in the bilayer nickelate superconductor La3Ni2O7 via nonlinear phononics
• Unifying Measurement Schemes in 2-D Terahertz Spectroscopy
• Observation of angular momentum transfer among crystal lattice modes
• Momentum-resolved two-dimensional spectroscopy as a probe of nonlinear quantum field dynamics