Pairing versus phase coherence of doped holes in distinct quantum spin backgrounds
Name
PhysRevB.97.115144.pdf
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550.61 KB
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Author(s)
Zhu, Zheng
Sheng, D. N.
Weng, Zheng-Yu
Date Issued
March 2018
Journal
Physical Review B
Publisher
American Physical Society
Citation
Zhu, Zheng et al. "Pairing versus phase coherence of doped holes in distinct quantum spin backgrounds." Physical Review B 97, 11 (March 2018): 115144 © 2018 American Physical Society
Version
Final published version
Abstract
We examine the pairing structure of holes injected into two distinct spin backgrounds: a short-range antiferromagnetic phase versus a symmetry protected topological phase. Based on density matrix renormalization group (DMRG) simulation, we find that although there is a strong binding between two holes in both phases, phase fluctuations can significantly influence the pair-pair correlation depending on the spin-spin correlation in the background. Here the phase fluctuation is identified as an intrinsic string operator nonlocally controlled by the spins. We show that while the pairing amplitude is generally large, the coherent Cooper pairing can be substantially weakened by the phase fluctuation in the symmetry-protected topological phase, in contrast to the short-range antiferromagnetic phase. It provides an example of a non-BCS mechanism for pairing, in which the paring phase coherence is determined by the underlying spin state self-consistently, bearing an interesting resemblance to the pseudogap physics in the cuprate.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.97.115144
