Mott insulators in moiré transition metal dichalcogenides at fractional fillings: Slave-rotor mean-field theory
Fuente:
arXiv
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Preprint |
| Published: |
2023
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866909679815229440 |
|---|---|
| author | Song, Zhenhao Seifert, Urban F. P. Luo, Zhu-Xi Balents, Leon |
| author_facet | Song, Zhenhao Seifert, Urban F. P. Luo, Zhu-Xi Balents, Leon |
| contents | In this work, we study a slave-rotor mean-field theory of an extended Hubbard model, applicable to transition metal dichalcogenide moiré systems, that captures both the formation of Wigner crystals as well as exotic spin states on top of these charge backgrounds. Phase diagrams are mapped out for different choices of long-range Coulomb repulsion strength, reproducing several experimentally found Wigner crystal states. Assuming unbroken time reversal symmetry, we find several spin liquid states as well as dimer states at fractional fillings. While spin dimer states are always found to have the lowest mean field energy, several spin liquid states are energetically competitive and may be stabilized by including gauge fluctuations or further interaction terms. We further discuss possible experimental signatures of these states pertinent to two-dimensional moiré heterostructures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_05676 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Mott insulators in moiré transition metal dichalcogenides at fractional fillings: Slave-rotor mean-field theory Song, Zhenhao Seifert, Urban F. P. Luo, Zhu-Xi Balents, Leon Strongly Correlated Electrons Mesoscale and Nanoscale Physics In this work, we study a slave-rotor mean-field theory of an extended Hubbard model, applicable to transition metal dichalcogenide moiré systems, that captures both the formation of Wigner crystals as well as exotic spin states on top of these charge backgrounds. Phase diagrams are mapped out for different choices of long-range Coulomb repulsion strength, reproducing several experimentally found Wigner crystal states. Assuming unbroken time reversal symmetry, we find several spin liquid states as well as dimer states at fractional fillings. While spin dimer states are always found to have the lowest mean field energy, several spin liquid states are energetically competitive and may be stabilized by including gauge fluctuations or further interaction terms. We further discuss possible experimental signatures of these states pertinent to two-dimensional moiré heterostructures. |
| title | Mott insulators in moiré transition metal dichalcogenides at fractional fillings: Slave-rotor mean-field theory |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2307.05676 |