Pressure-enhanced fractional Chern insulators along a magic line in moiré transition metal dichalcogenides
We show that pressure applied to twisted WSe_{2} can enhance the many-body gap and region of stability of a fractional Chern insulator at filling ν=1/3. Our results are based on exact diagonalization of a continuum model, whose pressure dependence is obtained through ab initio methods. We interpret...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2023-08-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.5.L032022 |
| _version_ | 1797210477427687424 |
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| author | Nicolás Morales-Durán Jie Wang Gabriel R. Schleder Mattia Angeli Ziyan Zhu Efthimios Kaxiras Cécile Repellin Jennifer Cano |
| author_facet | Nicolás Morales-Durán Jie Wang Gabriel R. Schleder Mattia Angeli Ziyan Zhu Efthimios Kaxiras Cécile Repellin Jennifer Cano |
| author_sort | Nicolás Morales-Durán |
| collection | DOAJ |
| description | We show that pressure applied to twisted WSe_{2} can enhance the many-body gap and region of stability of a fractional Chern insulator at filling ν=1/3. Our results are based on exact diagonalization of a continuum model, whose pressure dependence is obtained through ab initio methods. We interpret our results in terms of a magic line in the pressure-vs-twist angle phase diagram: along the magic line, the bandwidth of the topmost moiré valence band is minimized while simultaneously its quantum geometry resembles that of an ideal Chern band. We expect our results to generalize to other twisted transition metal dichalcogenide homobilayers. |
| first_indexed | 2024-04-24T10:11:13Z |
| format | Article |
| id | doaj.art-f01bf4b20b884203ae75497b9d1ee2d1 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:11:13Z |
| publishDate | 2023-08-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-f01bf4b20b884203ae75497b9d1ee2d12024-04-12T17:33:18ZengAmerican Physical SocietyPhysical Review Research2643-15642023-08-0153L03202210.1103/PhysRevResearch.5.L032022Pressure-enhanced fractional Chern insulators along a magic line in moiré transition metal dichalcogenidesNicolás Morales-DuránJie WangGabriel R. SchlederMattia AngeliZiyan ZhuEfthimios KaxirasCécile RepellinJennifer CanoWe show that pressure applied to twisted WSe_{2} can enhance the many-body gap and region of stability of a fractional Chern insulator at filling ν=1/3. Our results are based on exact diagonalization of a continuum model, whose pressure dependence is obtained through ab initio methods. We interpret our results in terms of a magic line in the pressure-vs-twist angle phase diagram: along the magic line, the bandwidth of the topmost moiré valence band is minimized while simultaneously its quantum geometry resembles that of an ideal Chern band. We expect our results to generalize to other twisted transition metal dichalcogenide homobilayers.http://doi.org/10.1103/PhysRevResearch.5.L032022 |
| spellingShingle | Nicolás Morales-Durán Jie Wang Gabriel R. Schleder Mattia Angeli Ziyan Zhu Efthimios Kaxiras Cécile Repellin Jennifer Cano Pressure-enhanced fractional Chern insulators along a magic line in moiré transition metal dichalcogenides Physical Review Research |
| title | Pressure-enhanced fractional Chern insulators along a magic line in moiré transition metal dichalcogenides |
| title_full | Pressure-enhanced fractional Chern insulators along a magic line in moiré transition metal dichalcogenides |
| title_fullStr | Pressure-enhanced fractional Chern insulators along a magic line in moiré transition metal dichalcogenides |
| title_full_unstemmed | Pressure-enhanced fractional Chern insulators along a magic line in moiré transition metal dichalcogenides |
| title_short | Pressure-enhanced fractional Chern insulators along a magic line in moiré transition metal dichalcogenides |
| title_sort | pressure enhanced fractional chern insulators along a magic line in moire transition metal dichalcogenides |
| url | http://doi.org/10.1103/PhysRevResearch.5.L032022 |
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