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Phase diagram of an extended parafermion chain
by Jurriaan Wouters, Fabian Hassler, Hosho Katsura, Dirk Schuricht
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Submission summary
Authors (as registered SciPost users):  Fabian Hassler · Dirk Schuricht · Jurriaan Wouters 
Submission information  

Preprint Link:  https://arxiv.org/abs/2106.15823v2 (pdf) 
Date accepted:  20220131 
Date submitted:  20211210 08:41 
Submitted by:  Schuricht, Dirk 
Submitted to:  SciPost Physics Core 
Ontological classification  

Academic field:  Physics 
Specialties: 

Approach:  Theoretical 
Abstract
We study the phase diagram of an extended parafermion chain, which, in addition to terms coupling parafermions on neighbouring sites, also possesses terms involving four sites. Via a FradkinKadanoff transformation the parafermion chain is shown to be equivalent to the nonchiral $\mathbb{Z}_3$ axial nextnearest neighbour Potts model. We discuss a possible experimental realisation using heteronanostructures. The phase diagram contains several gapped phases, including a topological phase where the system possesses three (nearly) degenerate ground states, and a gapless Luttingerliquid phase.
Published as SciPost Phys. Core 5, 008 (2022)
Author comments upon resubmission
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Reply to referee 1
We thank the referee for his/her very positive comments and helpful suggestions. To broaden the context, we have added some remarks in the introduction on the potential use of parafermions in quantum computation and experimental realisations. Furthermore, we added remarks on the generalisation of our results to general Z_nsymmetric models at suitable places. We also added a comment on the used bond dimensions in the DMRG simulations and its effect on the accuracy of the numerical data (see footnote 7).
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Reply to referee 2
We thank the referee for his/her very positive comments and helpful suggestions. To broaden the context, we have added some remarks in the introduction on the potential use of parafermions in quantum computation. Furthermore, we extended the discussion of Section 3 regarding the parameters in our proposed experimental realisation, and added suitable references.
To answer the specific questions:
The bifurcation is the result of finitesize effects as was shown in Reference [68]. We have added this remark in the caption of Figure 7.
In connection with (19) we drop the boundary terms since we are only interested in the bulk behaviour. The derived predictions for the phase diagram along f=0 is consistent with our numerical results. For completeness we also discuss the boundary terms in Appendix A.
We attribute the increase of the central charge above c=1 when leaving the AFM phase to the KT transition when going into the Luttinger phase, which generally makes the numerical simulations demanding.
List of changes
added a sentence at the end of the first paragraph of the in introduction as well as the References 25,26
added three sentences at the end of the second paragraph of the introduction as well as the References 3540, both to add a discussion of quantum computation as suggested by referee 2
revised a sentence after (2) to include Reference [43]
added remarks on the generalisation to Z_n symmetry at several places
added several point in Section 3 and adapted Figure 1 accordingly
revised Figure 2 to incorporate the changes at very negative field strength f
added the used bond dimension in the first paragraph of Section 5
added footnote 6 on boundary terms appearing in the duality transformation
added footnote 7 on the quality of the numerical data
added a remark on the observed bifurcation of the data in the caption of Figure 7
revised Section 7 regarding the relevance of the U(1)breaking term and the resulting phase
dropped the previous Section 7.4 on the almost frustrationfree line, since the argument is replaced by the relevance of the U(1)breaking term given in Appendix C.3
slightly revised Section 8
slightly revised the conclusion
revised the acknowledgment
slightly revised the wording in Appendix B and the caption of Figure 15
revised the discussion of the U(1)breaking term in Appendix C.3
corrected a few typos
Submission & Refereeing History
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The authors implemented all the suggestions from the Referees. Importantly, in the revised manuscript, they corrected an error in Appendix C and its consequences. I find their analysis convincing and I agree that this revision does not affect the main results of the paper, whose quality and clarity remain intact.
Therefore, I still recommend its publication on SciPost Physics Core.