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YOU? · · 2021 · Open Access · · DOI: https://doi.org/10.21468/scipost.report.4046

We study the edge physics of the deconfined quantum phase transition (DQCP) between a spontaneous quantum spin Hall (QSH) insulator and a spin-singlet superconductor (SC).Although the bulk of this transition is in the same universality class as the paradigmatic deconfined Neel to valencebond-solid transition, the boundary physics has a richer structure due to proximity to a quantum spin Hall state.We use the parton trick to write down an effective field theory for the QSH-SC transition in the presence of a boundary.We calculate various edge properties in an N → ∞ limit.We show that the boundary Luttinger liquid in the QSH state survives at the phase transition, but only as "fractional" degrees of freedom that carry charge but not spin.The physical fermion remains gapless on the edge at the critical point, with a universal jump in the fermion scaling dimension as the system approaches the transition from the QSH side.The critical point could be viewed as a gapless analogue of the quantum spin Hall state but with the full SU (2) spin rotation symmetry, which cannot be realized if the bulk is gapped.

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Type: peer-review
Language: en
Landing Page: https://doi.org/10.21468/scipost.report.4046
OA Status: gold
References: 52
Related Works: 10
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DOI: https://doi.org/10.21468/scipost.report.4046

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Title: Report on 2110.08280v1

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Type: peer-review

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Language: en

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Publication year: 2021

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Publication date: 2021-12-15

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Authors: Ruochen Ma, Liujun Zou, Chong Wang

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Landing page: https://doi.org/10.21468/scipost.report.4046

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OA URL: https://doi.org/10.21468/scipost.report.4046

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Concepts: Chemistry

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