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<p>Recently, high-temperature superconductivity (HTSC) is found in the La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub>/SrLaAlO<sub>4</sub> ultrathin film with critical temperature <i>T</i><sub><i>c</i></sub> above the McMillan limit at ambient pressure (AP). It is eager to enhance <i>T</i><sub><i>c</i></sub> of La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub> at AP. We propose that a perpendicular electric field strongly enhances <i>T</i><sub><i>c</i></sub> in the single-bilayer film of La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub> at AP. Under electric field, the layer with lower potential energy will accept electrons flowing from the other layer to fill in the Ni-<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(3{d}_{{x}^{2}-{y}^{2}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mn>3</mn> <msub> <mrow> <mi>d</mi> </mrow> <mrow> <msup> <mrow> <mi>x</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msup> <mo>−</mo> <msup> <mrow> <mi>y</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msup> </mrow> </msub> </math></EquationSource> </InlineEquation> orbitals, as the nearly half-filled Ni-<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(3{d}_{{z}^{2}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mn>3</mn> <msub> <mrow> <mi>d</mi> </mrow> <mrow> <msup> <mrow> <mi>z</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msup> </mrow> </msub> </math></EquationSource> </InlineEquation> orbital cannot accommodate more electrons. With the enhancement of the filling fraction in the <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(3{d}_{{x}^{2}-{y}^{2}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mn>3</mn> <msub> <mrow> <mi>d</mi> </mrow> <mrow> <msup> <mrow> <mi>x</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msup> <mo>−</mo> <msup> <mrow> <mi>y</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msup> </mrow> </msub> </math></EquationSource> </InlineEquation> orbitals in this layer, the interlayer <i>s</i>-wave pairing is suppressed, but the intralayer <i>d</i>-wave pairing in this layer is strongly enhanced. We numerically verify this idea and yield that an imposed voltage of about 0.1&#xa0;~&#xa0;0.2 volt between layers is enough to realize liquid-nitrogen-temperature HTSC in this single bilayer at AP. Our results appeal for experimental verification.</p>

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Possible liquid-nitrogen-temperature superconductivity driven by perpendicular electric field in the single-bilayer film of La3Ni2O7 at ambient pressure

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  • 发表日期：

    2026年1月3日

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  • Zhi-Yan Shao,
  • Jia-Heng Ji,
  • Congjun Wu,
  • Dao-Xin Yao,
  • Fan Yang

摘要

Recently, high-temperature superconductivity (HTSC) is found in the La3Ni2O7/SrLaAlO4 ultrathin film with critical temperature Tc above the McMillan limit at ambient pressure (AP). It is eager to enhance Tc of La3Ni2O7 at AP. We propose that a perpendicular electric field strongly enhances Tc in the single-bilayer film of La3Ni2O7 at AP. Under electric field, the layer with lower potential energy will accept electrons flowing from the other layer to fill in the Ni- \(3{d}_{{x}^{2}-{y}^{2}}\) 3 d x 2 − y 2 orbitals, as the nearly half-filled Ni- \(3{d}_{{z}^{2}}\) 3 d z 2 orbital cannot accommodate more electrons. With the enhancement of the filling fraction in the \(3{d}_{{x}^{2}-{y}^{2}}\) 3 d x 2 − y 2 orbitals in this layer, the interlayer s-wave pairing is suppressed, but the intralayer d-wave pairing in this layer is strongly enhanced. We numerically verify this idea and yield that an imposed voltage of about 0.1 ~ 0.2 volt between layers is enough to realize liquid-nitrogen-temperature HTSC in this single bilayer at AP. Our results appeal for experimental verification.