Oriented Triplet $p$-Wave Pairing from Fermi surface Anisotropy and Nonlocal Attraction
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| Format: | Preprint |
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2026
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| _version_ | 1866912828889235456 |
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| author | Tan, Shuning Liu, Ji Zeng, Minghuan Ying, Tao Cao, Zhangkai Tang, Ho-Kin |
| author_facet | Tan, Shuning Liu, Ji Zeng, Minghuan Ying, Tao Cao, Zhangkai Tang, Ho-Kin |
| contents | Using constrained-path quantum Monte Carlo, we map the ground-state phase diagram versus the nearest-neighbor (NN) attraction $V$ and spin-dependent hopping anisotropy $α$ for the two-dimensional attractive $t$--$U$--$V$ Hubbard model at filling $n\simeq0.85$. We identify an onsite $s$-wave superfluid, a Cooper pair Bose metal with an uncondensed Bose surface, and an oriented equal-spin triplet $p$-wave pairing phase. The NN attraction activates the odd-parity channel, while hopping anisotropy suppresses the competing $s$-wave coherence and selects a $p_x/p_y$ polar axis, and thus lowers the critical $|V_c|$ for the onset of triplet-dominant $p$-wave pairing. A channel-resolved Landau analysis provides a criterion for the Landau $p$-wave scale $V_c^{\mathrm L}(α)$, consistent with the observed anisotropy dependence of $|V_c|$. Our results establish how NN interaction and Fermi surface anisotropy cooperate to generate the oriented triplet $p$-wave pairing, and suggest that cold-atom and altermagnetic platforms could potentially realize this mechanism. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_11267 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Oriented Triplet $p$-Wave Pairing from Fermi surface Anisotropy and Nonlocal Attraction Tan, Shuning Liu, Ji Zeng, Minghuan Ying, Tao Cao, Zhangkai Tang, Ho-Kin Superconductivity Using constrained-path quantum Monte Carlo, we map the ground-state phase diagram versus the nearest-neighbor (NN) attraction $V$ and spin-dependent hopping anisotropy $α$ for the two-dimensional attractive $t$--$U$--$V$ Hubbard model at filling $n\simeq0.85$. We identify an onsite $s$-wave superfluid, a Cooper pair Bose metal with an uncondensed Bose surface, and an oriented equal-spin triplet $p$-wave pairing phase. The NN attraction activates the odd-parity channel, while hopping anisotropy suppresses the competing $s$-wave coherence and selects a $p_x/p_y$ polar axis, and thus lowers the critical $|V_c|$ for the onset of triplet-dominant $p$-wave pairing. A channel-resolved Landau analysis provides a criterion for the Landau $p$-wave scale $V_c^{\mathrm L}(α)$, consistent with the observed anisotropy dependence of $|V_c|$. Our results establish how NN interaction and Fermi surface anisotropy cooperate to generate the oriented triplet $p$-wave pairing, and suggest that cold-atom and altermagnetic platforms could potentially realize this mechanism. |
| title | Oriented Triplet $p$-Wave Pairing from Fermi surface Anisotropy and Nonlocal Attraction |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2601.11267 |