Insulating phases driven by unequal on-site repulsion in the 1D unconventional Hubbard model
The one-dimensional unconventional Hubbard model with alternating on-site interaction at odd (Uo) and even (Ue) lattice sites is analytically studied in the weak-coupling regime. The existence of unequal on-site repulsion (Uo≠Ue) makes a dramatic impact on the charge excitation behavior in one dimen...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-05-01
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| Series: | Results in Physics |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379721003521 |
| _version_ | 1818944987678638080 |
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| author | Yan Xu Hanqin Ding Jun Zhang |
| author_facet | Yan Xu Hanqin Ding Jun Zhang |
| author_sort | Yan Xu |
| collection | DOAJ |
| description | The one-dimensional unconventional Hubbard model with alternating on-site interaction at odd (Uo) and even (Ue) lattice sites is analytically studied in the weak-coupling regime. The existence of unequal on-site repulsion (Uo≠Ue) makes a dramatic impact on the charge excitation behavior in one dimension. At quarter filling, the alternating Hubbard interaction leads to the occurrence of umklapp processes and to the generation of a charge gap. As usual, the low-energy spin excitation is still massless. The ground state shows insulating behavior, characterized by the coexisting spin-density-wave and charge-density-wave instabilities. |
| first_indexed | 2024-12-20T07:51:57Z |
| format | Article |
| id | doaj.art-ef5042106e204bb2896791cf83f7d70a |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-12-20T07:51:57Z |
| publishDate | 2021-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-ef5042106e204bb2896791cf83f7d70a2022-12-21T19:47:49ZengElsevierResults in Physics2211-37972021-05-0124104206Insulating phases driven by unequal on-site repulsion in the 1D unconventional Hubbard modelYan Xu0Hanqin Ding1Jun Zhang2School of Physical Science and Technology, Xinjiang University, Urumqi 830046, ChinaCorresponding authors.; School of Physical Science and Technology, Xinjiang University, Urumqi 830046, ChinaCorresponding authors.; School of Physical Science and Technology, Xinjiang University, Urumqi 830046, ChinaThe one-dimensional unconventional Hubbard model with alternating on-site interaction at odd (Uo) and even (Ue) lattice sites is analytically studied in the weak-coupling regime. The existence of unequal on-site repulsion (Uo≠Ue) makes a dramatic impact on the charge excitation behavior in one dimension. At quarter filling, the alternating Hubbard interaction leads to the occurrence of umklapp processes and to the generation of a charge gap. As usual, the low-energy spin excitation is still massless. The ground state shows insulating behavior, characterized by the coexisting spin-density-wave and charge-density-wave instabilities.http://www.sciencedirect.com/science/article/pii/S2211379721003521Unconventional Hubbard modelAlternating on-site interactionUmklapp processQuarter fillingPhase diagram |
| spellingShingle | Yan Xu Hanqin Ding Jun Zhang Insulating phases driven by unequal on-site repulsion in the 1D unconventional Hubbard model Results in Physics Unconventional Hubbard model Alternating on-site interaction Umklapp process Quarter filling Phase diagram |
| title | Insulating phases driven by unequal on-site repulsion in the 1D unconventional Hubbard model |
| title_full | Insulating phases driven by unequal on-site repulsion in the 1D unconventional Hubbard model |
| title_fullStr | Insulating phases driven by unequal on-site repulsion in the 1D unconventional Hubbard model |
| title_full_unstemmed | Insulating phases driven by unequal on-site repulsion in the 1D unconventional Hubbard model |
| title_short | Insulating phases driven by unequal on-site repulsion in the 1D unconventional Hubbard model |
| title_sort | insulating phases driven by unequal on site repulsion in the 1d unconventional hubbard model |
| topic | Unconventional Hubbard model Alternating on-site interaction Umklapp process Quarter filling Phase diagram |
| url | http://www.sciencedirect.com/science/article/pii/S2211379721003521 |
| work_keys_str_mv | AT yanxu insulatingphasesdrivenbyunequalonsiterepulsioninthe1dunconventionalhubbardmodel AT hanqinding insulatingphasesdrivenbyunequalonsiterepulsioninthe1dunconventionalhubbardmodel AT junzhang insulatingphasesdrivenbyunequalonsiterepulsioninthe1dunconventionalhubbardmodel |