Nonmesonic Quantum Many-Body Scars in a 1D Lattice Gauge Theory

• URL: http://arxiv.org/abs/2303.13156v3
• Date: Wed, 22 May 2024 06:28:00 GMT
• Title: Nonmesonic Quantum Many-Body Scars in a 1D Lattice Gauge Theory
• Authors: Zi-Yong Ge, Yu-Ran Zhang, Franco Nori,
• Abstract summary: We investigate the meson excitations in quantum many-body scars of a 1D $mathbbZ$ lattice gauge theory coupled to a dynamical spin-$frac12$ chain as a matter field. Our results expand the physics of quantum many-body scars in lattice gauge theories and reveal that the nonmesonic state can also manifest ergodicity breaking.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We investigate the meson excitations (particle-antiparticle bound states) in quantum many-body scars of a 1D $\mathbb{Z}_2$ lattice gauge theory coupled to a dynamical spin-$\frac{1}{2}$ chain as a matter field. By introducing a string representation of the physical Hilbert space, we express a scar state $\ket {\Psi_{n,l}}$ as a superposition of all string bases with an identical string number $n$ and a total length $l$. For the small-$l$ scar state $\ket {\Psi_{n,l}}$, the gauge-invariant spin exchange correlation function of the matter field hosts an exponential decay as the distance increases, indicating the existence of stable mesons. However, for large $l$, the correlation function exhibits a power-law decay, signaling the emergence of nonmesonic excitations. Furthermore, we show that this mesonic-nonmesonic crossover can be detected by the quench dynamics, starting from two low-entangled initial states, respectively, which are experimentally feasible in quantum simulators. Our results expand the physics of quantum many-body scars in lattice gauge theories and reveal that the nonmesonic state can also manifest ergodicity breaking.

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