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

Autor:	Blank, T. G. H., Grishunin, K. A., Zvezdin, K. A., Hai, N. T., Wu, J. C., Su, S. -H., Huang, J. -C. A., Zvezdin, A. K., Kimel, A. V.
Rok vydání:	2022
Předmět:	Condensed Matter - Materials Science
Zdroj:	Phys. Rev. Lett. 131, 026902 (2023)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.131.026902
Popis:	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. Comment: 27 pages, 20 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2212.07532 Zobrazit plný text záznamu View this record from Arxiv