تقرير
Finite-size effects in Luther-Emery phases of Holstein and Hubbard models
| العنوان: | Finite-size effects in Luther-Emery phases of Holstein and Hubbard models |
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| المؤلفون: | Greitemann, J., Hesselmann, S., Wessel, S., Assaad, F. F., Hohenadler, M. |
| المصدر: | Phys. Rev. B 92, 245132 (2015) |
| سنة النشر: | 2015 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | The one-dimensional Holstein model and its generalizations have been studied extensively to understand the effects of electron-phonon interaction. The half-filled case is of particular interest, as it describes a transition from a metallic phase with a spin gap due to attractive backscattering to a Peierls insulator with charge-density-wave (CDW) order. Our quantum Monte Carlo results support the existence of a metallic phase with dominant power-law charge correlations, as described by the Luther-Emery fixed point. We demonstrate that for Holstein and also for purely fermionic models the spin gap significantly complicates finite-size numerical studies, and explains inconsistent previous results for Luttinger parameters and phase boundaries. On the other hand, no such complications arise in spinless models. The correct low-energy theory of the spinful Holstein model is argued to be that of singlet bipolarons with a repulsive, mutual interaction. This picture naturally explains the existence of a metallic phase, but also implies that gapless Luttinger liquid theory is not applicable. Comment: 17 pages, 18 figures, final version |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.92.245132 |
| URL الوصول: | http://arxiv.org/abs/1510.07454 |
| رقم الأكسشن: | edsarx.1510.07454 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.92.245132 |
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