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.

27 pages, 20 figures

References in corpus (7)

• Nonlinear light-matter interaction at terahertz frequencies
• Terahertz-Light Driven Coupling of Antiferromagnetic Spins to Lattice
• Ultrafast Structure Switching through Nonlinear Phononics
• Pressure-induced Topological and Structural Phase Transitions in an Antiferromagnetic Topological Insulator
• Two-Dimensional Terahertz Spectroscopy of Condensed-Phase Molecular Systems
• Dynamical properties of magnetic topological insulator $T$Bi${}_2$Te${}_4$ ($T=$Mn, Fe): phonons dispersion, Raman active modes, and chiral phonons study
• Group theory study of the vibrational modes and magnetic order in the topological antiferromagnet MnBi${}_2$Te${}_4$

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