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:Physical review. B 2017-11, Vol.96 (19), Article 195144
Main Authors: Yu, Zuo-Dong, Zhou, Yuan, Gong, Chang-De
Format: Article
Language:English
Subjects:
Computer simulation
Constraint modelling
Cuprates
Dispersion
Glass
Monte Carlo simulation
Parameters
Spin dynamics
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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 more than the other candidates is likely the consequence of the stripe state.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.96.195144