Pair-density-wave phase of strongly interacting electrons on the triangular lattice: A variational Monte Carlo study
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866912669256122368 |
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| author | Wang, Jiucai Sun, Wen Wang, Hao-Xin Han, Zhaoyu Kivelson, Steven A. Yao, Hong |
| author_facet | Wang, Jiucai Sun, Wen Wang, Hao-Xin Han, Zhaoyu Kivelson, Steven A. Yao, Hong |
| contents | A robust theory of the mechanism of pair density wave (PDW) superconductivity (i.e. where Cooper pairs have nonzero center of mass momentum) remains elusive. Here we explore the triangular lattice $t$-$J$-$V$ model, a low-energy effective theory derived from the strong-coupling limit of the Holstein-Hubbard model, by large-scale variational Monte Carlo simulations. When the electron density is sufficiently low, the favored ground state is an s-wave PDW, consistent with results obtained from previous studies in this limit. Additionally, a PDW ground state with nematic d-wave pairing emerges in the intermediate range of electron densities and phonon frequencies. For these s-wave and d-wave PDWs arising in states with spontaneous breaking of time-reversal and inversion symmetries, PDW formation derives from valley-polarization and intra-pocket pairing. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2404_11950 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Pair-density-wave phase of strongly interacting electrons on the triangular lattice: A variational Monte Carlo study Wang, Jiucai Sun, Wen Wang, Hao-Xin Han, Zhaoyu Kivelson, Steven A. Yao, Hong Strongly Correlated Electrons Superconductivity A robust theory of the mechanism of pair density wave (PDW) superconductivity (i.e. where Cooper pairs have nonzero center of mass momentum) remains elusive. Here we explore the triangular lattice $t$-$J$-$V$ model, a low-energy effective theory derived from the strong-coupling limit of the Holstein-Hubbard model, by large-scale variational Monte Carlo simulations. When the electron density is sufficiently low, the favored ground state is an s-wave PDW, consistent with results obtained from previous studies in this limit. Additionally, a PDW ground state with nematic d-wave pairing emerges in the intermediate range of electron densities and phonon frequencies. For these s-wave and d-wave PDWs arising in states with spontaneous breaking of time-reversal and inversion symmetries, PDW formation derives from valley-polarization and intra-pocket pairing. |
| title | Pair-density-wave phase of strongly interacting electrons on the triangular lattice: A variational Monte Carlo study |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2404.11950 |