Cavity-induced CDW phase transition in 1T-TaS2
Dongbin Shin
Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea
Cavity-induced CDW phase transition in 1T-TaS2
Dongbin Shin
Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea
Light-induced phase transitions in condensed matter systems have attracted significant attention due to their potential applications and unprecedented physical phenomena. Recent studies have demonstrated light-induced topological phase transitions in materials such as WTe2 and ZrTe5 [1-2], which have been explained by lattice dynamics caused by excited electronic structures [3]. Unlike laser pump-induced phenomena, which induce non-equilibrium dynamics, the optical cavity can modify the material properties statically. A recent experiment demonstrated that the charge density wave (CDW) phase transition temperature can be modified under the optical cavity to 120 K from 150 K in 1T-TaS2 [4]. This seminar shows our recent theoretical study on the cavity-modified CDW phase transition through a state-of-the-art quantum electron dynamics density functional theory calculation [5]. First, we discuss the microscopic mechanism of CDW phase transition in vacuum space under the thermal equilibrium. Second, we suggest a possible mechanism for cavity-modified CDW phase transition temperature.
References
[1] Sie, E. J. et al. An ultrafast symmetry switch in a Weyl semimetal. Nature 565, 61–66 (2019).
[2] Vaswani, C. et al. Light-Driven Raman Coherence as a Nonthermal Route to Ultrafast Topology Switching in a Dirac Semimetal. Phys Rev X 10, 021013 (2020).
[3] Guan, M.-X., Wang, E., You, P.-W., Sun, J.-T. & Meng, S. Manipulating Weyl quasiparticles by orbital-selective photoexcitation in WTe2. Nat Commun 12, 1885 (2021).
[4] G. Jarc et al., Cavity-Mediated Thermal Control of Metal-to-Insulator Transition in 1T-TaS2, Nature 622, 487 (2023).
[5] I.-T. Lu, M. Ruggenthaler, N. Tancogne-Dejean, S. Latini, M. Penz, and A. Rubio, Electron-Photon Exchange-Correlation Approximation for QEDFT, arXiv (2024).