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Extended Coulomb liquid of paired hardcore boson model on a pyrochlore lattice

by Chun-Jiong Huang, Changle Liu, Ziyang Meng, Yue Yu, Youjin Deng, and Gang Chen

Submission summary

As Contributors: Gang Chen
Preprint link: scipost_201908_00004v1
Date submitted: 2019-08-04
Submitted by: Chen, Gang
Submitted to: SciPost Physics
Domain(s): Theor. & Comp.
Subject area: Condensed Matter Physics - Theory

Abstract

There is a growing interest in the U(1) Coulomb liquid in both quantum materials in pyrochlore ice and cluster Mott insulators and cold atom systems. We explore a paired hardcore boson model on a pyrochlore lattice. This model is equivalent to the XYZ spin model that was proposed for rare-earth pyrochlores with “dipole-octupole” doublets. Since our model has no sign problem for quantum Monte Carlo (QMC) simulations in a large parameter regime, we carry out both analytical and QMC calculations. We find that the U (1) Coulomb liquid is quite stable and spans a rather large portion of the phase diagram with boson pairing. Moreover, we numerically find a thermodynamic evidence that the boson pairing could induce a possible Z2 liquid in the vicinity of the phase boundary between Coulomb liquid and Z2 symmetry-broken phase. Besides the materials’ relevance with quantum spin ice, we point to quantum simulation with cold atoms on optical lattices.

Current status:
Editor-in-charge assigned

Submission & Refereeing History

Submission scipost_201908_00004v1 on 4 August 2019

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