Solitons with irrational charge in a one-dimensional quantum ferroelectric
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866916290410577920 |
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| author | Zhao, Sijia Kivelson, Steven A. |
| author_facet | Zhao, Sijia Kivelson, Steven A. |
| contents | We use analytic (mean-field) and density-matrix renormalization group (DMRG) methods to study a simplified one-dimensional version of the SSH-Holstein model of electron-phonon interactions with one electron per site (half filling) where, as a function of the ratio of the two couplings, three distinct insulating phases arise - a site-centered charge-density-wave (CDW), a bond-centered bond-density-wave (BDW), and an intermediate ferroelectric (inversion-symmetry breaking) phase with coexisting CDW and BDW order. In the intermediate phase our DMRG results establish the existence of point-like soliton excitations with irrational charge (that depends on a ratio of coupling constants) and either spin 1/2 or spin 0, and a surprisingly light effective mass. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_11952 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Solitons with irrational charge in a one-dimensional quantum ferroelectric Zhao, Sijia Kivelson, Steven A. Strongly Correlated Electrons We use analytic (mean-field) and density-matrix renormalization group (DMRG) methods to study a simplified one-dimensional version of the SSH-Holstein model of electron-phonon interactions with one electron per site (half filling) where, as a function of the ratio of the two couplings, three distinct insulating phases arise - a site-centered charge-density-wave (CDW), a bond-centered bond-density-wave (BDW), and an intermediate ferroelectric (inversion-symmetry breaking) phase with coexisting CDW and BDW order. In the intermediate phase our DMRG results establish the existence of point-like soliton excitations with irrational charge (that depends on a ratio of coupling constants) and either spin 1/2 or spin 0, and a surprisingly light effective mass. |
| title | Solitons with irrational charge in a one-dimensional quantum ferroelectric |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2406.11952 |