Disconnecting a Traversable Wormhole: Universal Quench Dynamics in Random Spin Models

Abstract

Understanding strongly interacting quantum matter and quantum gravity are both important open issues in theoretical physics, and the holographic duality between quantum field theory and gravity theory nicely brings these two topics together. Nevertheless, direct connections between gravity physics and experimental observations in quantum matter are still rare. Here we utilize the gravity physics picture to understand quench dynamics experimentally observed in a class of random spin models realized in several different quantum systems, where the dynamics of magnetization are measured after the external polarization field is suddenly turned off. Two universal features of the magnetization dynamics, namely, a slow decay described by a stretched exponential function and an oscillatory behavior, are respectively found in different parameter regimes across different systems. This work addresses the issues of generic conditions under which these two universal features can occur, and we find that a natural answer to this question emerges in the gravity picture. By the holographic duality bridged by a model proposed by Maldacena and Qi, the quench dynamics after suddenly turning off the external polarization field is mapped to disconnecting an eternal traversable wormhole. Our studies show that insight from gravity physics can help unifying different experiments in quantum systems.

arXiv comment9 pages, 4 figures + supplementary

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• Sachdev-Ye-Kitaev Models and Beyond: A Window into Non-Fermi Liquids
• Superconducting instabilities in a spinful Sachdev-Ye-Kitaev model
• Controlling local thermalization dynamics in a Floquet-engineered dipolar ensemble
• Probing quantum chaos in multipartite systems
• Emergent Universal Quench Dynamics in Randomly Interacting Spin Models
• Dynamical Freezing in Exactly Solvable Models of Driven Chaotic Quantum Dots
• Violation and Revival of Kramers' Degeneracy in Open Quantum Systems
• $T\bar{T}$ deformation on non-Hermitian two coupled SYK model
• Attenuating Dynamics of Strongly Interacting Fermionic Superfluids in SYK Solvable Models
• Hot wormholes and chaos dynamics in a two-coupled SYK model
• Universal Aspects of High-Temperature Relaxation Dynamics in Random Spin Models
• Replicas, averaging and factorization in the IIB matrix model