Inhomogeneous superconductivity in (001), (110) and (111) KTaO$_3$ two-dimensional electronic gas: $T_c$ driven from electronic confinement
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| Format: | Preprint |
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2026
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| _version_ | 1866915817659039744 |
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| author | Trama, Matta Citro, Roberta Perroni, Carmine Antonio |
| author_facet | Trama, Matta Citro, Roberta Perroni, Carmine Antonio |
| contents | We investigate superconductivity in KTaO$_3$ (KTO)-based two-dimensional electron gases for the (001), (110), and (111) crystallographic orientations within a unified microscopic framework. Using a self-consistent tight-binding slab model, we determine the confinement potential, electronic structure, and orbital composition for each orientation, explicitly including inversion-symmetry-induced orbital Rashba couplings. Using a local spin-singlet s-wave pairing interaction, we find that the pronounced orientation dependence of the superconducting critical temperature primarily originates from differences in the spatial extent of the two-dimensional electron gas and the associated redistribution of the density of states at the Fermi level, rather than from changes in the pairing interaction. Our results provide a microscopic explanation for the experimentally observed orientation dependence of superconductivity at KTO-based interfaces. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_22316 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Inhomogeneous superconductivity in (001), (110) and (111) KTaO$_3$ two-dimensional electronic gas: $T_c$ driven from electronic confinement Trama, Matta Citro, Roberta Perroni, Carmine Antonio Superconductivity Mesoscale and Nanoscale Physics Materials Science We investigate superconductivity in KTaO$_3$ (KTO)-based two-dimensional electron gases for the (001), (110), and (111) crystallographic orientations within a unified microscopic framework. Using a self-consistent tight-binding slab model, we determine the confinement potential, electronic structure, and orbital composition for each orientation, explicitly including inversion-symmetry-induced orbital Rashba couplings. Using a local spin-singlet s-wave pairing interaction, we find that the pronounced orientation dependence of the superconducting critical temperature primarily originates from differences in the spatial extent of the two-dimensional electron gas and the associated redistribution of the density of states at the Fermi level, rather than from changes in the pairing interaction. Our results provide a microscopic explanation for the experimentally observed orientation dependence of superconductivity at KTO-based interfaces. |
| title | Inhomogeneous superconductivity in (001), (110) and (111) KTaO$_3$ two-dimensional electronic gas: $T_c$ driven from electronic confinement |
| topic | Superconductivity Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2602.22316 |