Pattern formation in charge density wave states after a quantum quench

• URL: http://arxiv.org/abs/2312.13727v1
• Date: Thu, 21 Dec 2023 10:50:26 GMT
• Title: Pattern formation in charge density wave states after a quantum quench
• Authors: Lingyu Yang, Yang Yang, Gia-Wei Chern
• Abstract summary: We study post-quench dynamics of charge-density-wave (CDW) order in the square-lattice $t$-$V$ model. Our large-scale simulations uncover complex pattern formations in the post-quench CDW states, especially in the strong quench regime.
• Score: 5.155523246793565
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We study post-quench dynamics of charge-density-wave (CDW) order in the square-lattice $t$-$V$ model. The ground state of this system at half-filling is characterized by a checkerboard modulation of particle density. A generalized self-consistent mean-field method, based on the time-dependent variational principle, is employed to describe the dynamical evolution of the CDW states. Assuming a homogeneous CDW order throughout the quench process, the time-dependent mean-field approach is reduced to the Anderson pseudospin method. Quench simulations based on the Bloch equation for pseudospins produce three canonical behaviors of order-parameter dynamics: phase-locked persistent oscillation, Landau-damped oscillation, and dynamical vanishing of the CDW order. We further develop an efficient real-space von Neumann equation method to incorporate dynamical inhomogeneity into simulations of quantum quenches. Our large-scale simulations uncover complex pattern formations in the post-quench CDW states, especially in the strong quench regime. The emergent spatial textures are characterized by super density modulations on top of the short-period checkerboard CDW order. Our demonstration of pattern formation in quenched CDW states, described by a simple broken $Z_2$ symmetry, underscores the importance of dynamical inhomogeneity in quantum quenches of many-body systems with more complex orders.

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