Ground-state phase diagram of the one-dimensional t−J model with pair hopping terms
| Autor: | Dieter Jaksch, Jonathan R. Coulthard, Stephen R. Clark |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Superconductivity Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Hubbard model Density matrix renormalization group FOS: Physical sciences Order (ring theory) Context (language use) 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences 3. Good health Condensed Matter - Strongly Correlated Electrons Quantum Gases (cond-mat.quant-gas) Superexchange Condensed Matter::Superconductivity 0103 physical sciences t-J model Condensed Matter::Strongly Correlated Electrons Condensed Matter - Quantum Gases 010306 general physics 0210 nano-technology Ground state |
| Zdroj: | Physical Review B Coulthard, J R, Clark, S R & Jaksch, D 2018, ' Ground-state phase diagram of the one-dimensional t-J model with pair hopping terms ', Physical Review B, vol. 98, no. 3, 035116 . https://doi.org/10.1103/PhysRevB.98.035116 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | The $t$-$J$ model is a standard model of strongly correlated electrons, often studied in the context of high-$T_c$ superconductivity. However, most studies of this model neglect three-site terms, which appear at the same order as the superexchange $J$. As these terms correspond to pair-hopping, they are expected to play an important role in the physics of superconductivity when doped sufficiently far from half-filling. In this paper we present a density matrix renormalisation group study of the one-dimensional $t$-$J$ model with the pair hopping terms included. We demonstrate that that these additional terms radically change the one-dimensional ground state phase diagram, extending the superconducting region at low fillings, while at larger fillings, superconductivity is completely suppressed. We explain this effect by introducing a simplified effective model of repulsive hardcore bosons. 10 Pages, 7 figures |
| Databáze: | OpenAIRE |
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