Effect of dispersive optical phonons on the properties of Bond Su-Schrieffer-Heeger polaron
Fuente:
arXiv
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866914812159590400 |
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| author | Zhang, Chao |
| author_facet | Zhang, Chao |
| contents | We use a newly developed quantum Monte Carlo method to investigate the impact of finite dispersion of the optical phonon mode on the properties of the bond Su-Schrieffer-Heeger polaron in two dimensions. We compare the properties of the bond polaron, such as effective mass, ground state energy, and Z factor, with and without positive phonon bandwidth. Our findings reveal that when we exclude phonon dispersion, at the same electron-phonon coupling strength, the effective mass increases as the phonon frequency decreases, indicating a heavier polaron in the deep adiabatic regime. However, in the dispersive case, we observe that the effective mass increases as the phonon bandwidth increases. Moreover, we notice a crossover from a light polaron state to a heavy polaron state in the deep adiabatic regime for both the dispersionless and dispersive cases. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2303_15303 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Effect of dispersive optical phonons on the properties of Bond Su-Schrieffer-Heeger polaron Zhang, Chao Strongly Correlated Electrons We use a newly developed quantum Monte Carlo method to investigate the impact of finite dispersion of the optical phonon mode on the properties of the bond Su-Schrieffer-Heeger polaron in two dimensions. We compare the properties of the bond polaron, such as effective mass, ground state energy, and Z factor, with and without positive phonon bandwidth. Our findings reveal that when we exclude phonon dispersion, at the same electron-phonon coupling strength, the effective mass increases as the phonon frequency decreases, indicating a heavier polaron in the deep adiabatic regime. However, in the dispersive case, we observe that the effective mass increases as the phonon bandwidth increases. Moreover, we notice a crossover from a light polaron state to a heavy polaron state in the deep adiabatic regime for both the dispersionless and dispersive cases. |
| title | Effect of dispersive optical phonons on the properties of Bond Su-Schrieffer-Heeger polaron |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2303.15303 |