Variational Monte Carlo study of spin dynamics in underdoped cuprates

The hour-glass-like dispersion of spin excitations is a common feature of underdoped cuprates. It was qualitatively explained by the random phase approximation based on various ordered states with some phenomenological parameters; however, its origin remains elusive. Here, we present a numerical stu...

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Bibliographic Details
Published in:arXiv.org 2017-11
Main Authors: Zuo-Dong, Yu, Zhou, Yuan, Chang-De, Gong
Format: Article
Language:English
Subjects:
Computer simulation
Constraint modelling
Cuprates
Dispersion
Glass
Monte Carlo simulation
Occupancy
Parameters
Spin dynamics
Online Access:Get full text
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Summary:The hour-glass-like dispersion of spin excitations is a common feature of underdoped cuprates. It was qualitatively explained by the random phase approximation based on various ordered states with some phenomenological parameters; however, its origin remains elusive. Here, we present a numerical study of spin dynamics in the \(t\)-\(J\) model using the variational Monte Carlo method. This parameter-free method satisfies the no double-occupancy constraint of the model and thus provides a better evaluation on the spin dynamics with respect to various mean-field trial states. We conclude that the lower branch of the hour-glass dispersion is a collective mode and the upper branch is more likely the consequence of the stripe state than the other candidates.
ISSN:2331-8422
DOI:10.48550/arxiv.1711.04479