Tunable Competing Electronic Orders in Double Quantum Spin Hall Superlattices
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866917313331068928 |
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| author | Hung, Yi-Chun Hsu, Chen-Hsuan Bansil, Arun |
| author_facet | Hung, Yi-Chun Hsu, Chen-Hsuan Bansil, Arun |
| contents | Competing superconducting (SC) and density-wave orders are of key importance in generating unconventional superconductivity and emergent electronic responses. Quasi-one-dimensional models provide insight into these competing orders and suggest higher-dimensional realizations through coupled-wire constructions, but analysis of such systems remains limited. Recent studies suggest that double helical edge states (DHESs) in double quantum spin Hall insulators (DQSHIs) form a two-channel Luttinger liquid that exhibits SC and spin density wave (SDW) phases and their $π$-junction analogs. Here, we analyze weakly coupled DHESs from the surface of a periodically stacked layered structure consisting of DQSHIs and dielectrics, where inter-edge interactions approximately develop a tunable helical sliding Luttinger liquid (HSLL) order. Using a renormalization-group analysis, we construct phase diagrams and identify a regime of HSLL parameters that favor competing two-dimensional $π$-SC and $π$-SDW orders. We identify parameter regimes where the competing orders could be realized experimentally in nanoscale devices. Our study suggests a promising materials platform for exploring tunable $π$-SC and $π$-SDW orders in double quantum spin Hall superlattices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_22715 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Tunable Competing Electronic Orders in Double Quantum Spin Hall Superlattices Hung, Yi-Chun Hsu, Chen-Hsuan Bansil, Arun Mesoscale and Nanoscale Physics Competing superconducting (SC) and density-wave orders are of key importance in generating unconventional superconductivity and emergent electronic responses. Quasi-one-dimensional models provide insight into these competing orders and suggest higher-dimensional realizations through coupled-wire constructions, but analysis of such systems remains limited. Recent studies suggest that double helical edge states (DHESs) in double quantum spin Hall insulators (DQSHIs) form a two-channel Luttinger liquid that exhibits SC and spin density wave (SDW) phases and their $π$-junction analogs. Here, we analyze weakly coupled DHESs from the surface of a periodically stacked layered structure consisting of DQSHIs and dielectrics, where inter-edge interactions approximately develop a tunable helical sliding Luttinger liquid (HSLL) order. Using a renormalization-group analysis, we construct phase diagrams and identify a regime of HSLL parameters that favor competing two-dimensional $π$-SC and $π$-SDW orders. We identify parameter regimes where the competing orders could be realized experimentally in nanoscale devices. Our study suggests a promising materials platform for exploring tunable $π$-SC and $π$-SDW orders in double quantum spin Hall superlattices. |
| title | Tunable Competing Electronic Orders in Double Quantum Spin Hall Superlattices |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2506.22715 |