Unconventional correlated metallic behavior due to interorbital Coulomb interaction
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866913541175377920 |
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| author | Boidi, N. Aucar Kampf, A. P. Hallberg, K. |
| author_facet | Boidi, N. Aucar Kampf, A. P. Hallberg, K. |
| contents | We study the non-degenerate one dimensional two-orbital Hubbard model with interorbital Coulomb interaction. By means of the density-matrix renormalization group technique, we calculate the local single-particle density of states and the optical conductivity at zero temperature. We find that a finite interorbital Coulomb repulsion $V$ generates a new class of states within the Mott-Hubbard band which has a large weight of holon-doublon pairs, which we hence call the holon-doublon band (HDB). When $V$ is sufficiently large, the HDB specifies the gapless low-energy excitations, and the system becomes an unconventional correlated metal. Optical conductivity results resolve different metallic behaviors for zero and finite interaction $V$. Compared to the case without interorbital interaction, the conductivity is strongly reduced in the correlated holon-doublon metal for finite $V$. In addition, the absorption spectrum is dominated by the HDB, which is clearly distinguishable from the Mott-Hubbard band. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_08284 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Unconventional correlated metallic behavior due to interorbital Coulomb interaction Boidi, N. Aucar Kampf, A. P. Hallberg, K. Strongly Correlated Electrons We study the non-degenerate one dimensional two-orbital Hubbard model with interorbital Coulomb interaction. By means of the density-matrix renormalization group technique, we calculate the local single-particle density of states and the optical conductivity at zero temperature. We find that a finite interorbital Coulomb repulsion $V$ generates a new class of states within the Mott-Hubbard band which has a large weight of holon-doublon pairs, which we hence call the holon-doublon band (HDB). When $V$ is sufficiently large, the HDB specifies the gapless low-energy excitations, and the system becomes an unconventional correlated metal. Optical conductivity results resolve different metallic behaviors for zero and finite interaction $V$. Compared to the case without interorbital interaction, the conductivity is strongly reduced in the correlated holon-doublon metal for finite $V$. In addition, the absorption spectrum is dominated by the HDB, which is clearly distinguishable from the Mott-Hubbard band. |
| title | Unconventional correlated metallic behavior due to interorbital Coulomb interaction |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2312.08284 |