Photoinduced charge-order melting dynamics in a one-dimensional interacting Holstein model

Abstract

Transient quantum dynamics in an interacting fermion-phonon system are investigated. In particular, a charge order (CO) melting after a short optical-pulse irradiation and roles of the quantum phonons on the transient dynamics are focused on. A spinless-fermion model in a one-dimensional chain coupled with local phonons is analyzed numerically. The infinite time-evolving block decimation algorithm is adopted as a reliable numerical method for one-dimensional quantum many-body systems. Numerical results for the photoinduced CO melting dynamics without phonons are well interpreted by the soliton picture for the CO domains. This interpretation is confirmed by the numerical simulation for an artificial local excitation and the classical soliton model. In the case of the large phonon frequency corresponding to the antiadiabatic condition, the CO melting is induced by propagations of the polaronic solitons with the renormalized soliton velocity. On the other hand, in the case of the small phonon frequency corresponding to the adiabatic condition, the first stage of the CO melting dynamics occurs due to the energy transfer from the fermionic to phononic systems, and the second stage is brought about by the soliton motions around the bottom of the soliton band. Present analyses provide a standard reference for the photoinduced CO melting dynamics in low-dimensional many-body quantum systems.

Charge-density-wave melting in the one-dimensional Holstein model

“…To summarize, we studied the melting of CDW order by means of real-time simulations of the half-filled Holstein model of spinless fermions in one dimension. To this end, we investigated relaxation dynamics that is dominated by electron-phonon coupling in the far-fromequilibrium regime, complementary to the case studied in [37] where strong electron interactions were present. We find a strong dependence of the transient dynamics on the precise initial state and on the model parameters.…”

“…Turning on electron-phonon interactions causes a slower decay due to the formation of polarons and thus a mass renormalization of the electrons. The excess energies pumped into the system that were considered in [37] are on the order of ∆E 0.1t 0 N above the ground-state energy, where N is the number of fermions in the system. In our work, we consider different initial states and we deliberately work in the regime of large quench energies 0.1t 0 N ∆E 8t 0 N to exemplify the capabilities of our local basis-approximation method.…”

Eigenstate thermalization and quantum chaos in the Holstein polaron model

“…A second timely motivation to study nonequilibrium problems in electron-phonon coupled systems stems from the experimental advances with time-resolved spectroscopy [47]. Such experiments have stimulated an increased interest in exploring nonequilibrium dynamics of isolated electron-phonon coupled systems theoretically [48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66]. Among them, systems with a single excited electron coupled to phonons (the so-called polaron case) provide a platform for accurate numerical simulations [49,58,60,67,68], allowing us to demonstrate, for certain nonequilibrium protocols, equilibration [52,58] and indications for thermalization [61].…”

Photoinduced transition to charge-ordered phases from dynamical localization in the metallic phase of α−(BEDT-TTF)2I3

“…[22][23][24][25][26][27][28]30,31 The photoinduced phase transition from the charge-ordered insulator to a metallic state has been observed in various materials by femtosecond pump-probe spectroscopy. [32][33][34][35][36][37][38][39][40][41] In α-(BEDT-TTF) 2 I 3 , the metallic state is generated in about 100 fs, and as many as about 250 molecules are converted to a metallic phase by one photon excitation, 32 showing the strong cooperative nature of the phenomena.…”