Chern-Textured Exciton Insulators with Valley Spiral Order in Moiré Materials
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arXiv
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| Format: | Preprint |
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2024
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| author | Wang, Ziwei Kwan, Yves H. Wagner, Glenn Simon, Steven H. Bultinck, Nick Parameswaran, S. A. |
| author_facet | Wang, Ziwei Kwan, Yves H. Wagner, Glenn Simon, Steven H. Bultinck, Nick Parameswaran, S. A. |
| contents | We explore the phase diagrams of moiré materials in search of a new class of intervalley-coherent correlated insulating state: the Chern texture insulator (CTI). This phase of matter, proposed in a companion paper, breaks valley $U(1)$ symmetry in a nontrivial fashion wherein the valley order parameter is forced to texture in momentum space as a consequence of band topology. Using detailed Hartree-Fock studies, we establish that the CTI emerges as an energetically competitive intermediate-coupling ground state in several moiré systems which lack a twofold rotation symmetry that forbids the single-particle topology essential to the formation of the CTI valley texture. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_15342 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Chern-Textured Exciton Insulators with Valley Spiral Order in Moiré Materials Wang, Ziwei Kwan, Yves H. Wagner, Glenn Simon, Steven H. Bultinck, Nick Parameswaran, S. A. Strongly Correlated Electrons Mesoscale and Nanoscale Physics We explore the phase diagrams of moiré materials in search of a new class of intervalley-coherent correlated insulating state: the Chern texture insulator (CTI). This phase of matter, proposed in a companion paper, breaks valley $U(1)$ symmetry in a nontrivial fashion wherein the valley order parameter is forced to texture in momentum space as a consequence of band topology. Using detailed Hartree-Fock studies, we establish that the CTI emerges as an energetically competitive intermediate-coupling ground state in several moiré systems which lack a twofold rotation symmetry that forbids the single-particle topology essential to the formation of the CTI valley texture. |
| title | Chern-Textured Exciton Insulators with Valley Spiral Order in Moiré Materials |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2406.15342 |