Quantum quenches in isolated quantum glasses out of equilibrium

Autor:	Thomson, S. J., Urbani, P., Schiro, M.
Rok vydání:	2019
Předmět:	Condensed Matter - Disordered Systems and Neural Networks Condensed Matter - Statistical Mechanics
Zdroj:	Phys. Rev. Lett. 125, 120602 (2020)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.125.120602
Popis:	In this work, we address the question of how a closed quantum system thermalises in the presence of a random external potential. By investigating the quench dynamics of the isolated quantum spherical $p$-spin model, a paradigmatic model of a mean-field glass, we aim to shed new light on this complex problem. Employing a closed-time Schwinger-Keldysh path integral formalism, we first initialise the system in a random, infinite-temperature configuration and allow it to equilibrate in contact with a thermal bath before switching off the bath and performing a quench. We find evidence that increasing the strength of either the interactions or the quantum fluctuations can act to lower the effective temperature of the isolated system and stabilise glassy behaviour. Comment: 6 pages, 3 figures + Supplementary Material
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1904.03147 Zobrazit plný text záznamu View this record from Arxiv