Phase diagram of the one-dimensional extended Hubbard model at half filling
We reexamine the ground-state phase diagram of the one-dimensional half-filled Hubbard model with on-site and nearest-neighbor repulsive interactions. We calculate second-order corrections to coupling constants in the weak-coupling renormalization-group approach ( g-ology) to show that the bond-char...
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| Published in | Physical review letters Vol. 88; no. 5; p. 056402 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
United States
04.02.2002
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| Online Access | Get more information |
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| Summary: | We reexamine the ground-state phase diagram of the one-dimensional half-filled Hubbard model with on-site and nearest-neighbor repulsive interactions. We calculate second-order corrections to coupling constants in the weak-coupling renormalization-group approach ( g-ology) to show that the bond-charge-density-wave (BCDW) phase exists for weak couplings in between the charge-density-wave (CDW) and spin-density-wave (SDW) phases. We find that the umklapp scattering of parallel-spin electrons destabilizes the BCDW state and gives rise to a bicritical point where the CDW-BCDW and SDW-BCDW continuous-transition lines merge into the CDW-SDW first-order transition line. |
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| ISSN: | 0031-9007 |
| DOI: | 10.1103/physrevlett.88.056402 |