Physics Letters A

Superconductive states with odd angular momentum pairing in the 2D repulsive Hubbard model

Cyril Leonidovich Malyshev, Victor Nikolaevich Popov

Published Mar 1, 1993• 9 citations

Publisher

DOI: 10.1016/0375-9601(93)90856-u

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Physics Letters A

Superconductive states with odd angular momentum pairing in the 2D repulsive Hubbard model

Cyril Leonidovich Malyshev, Victor Nikolaevich Popov

Published Mar 1, 1993• 9 citations

Publisher

DOI: 10.1016/0375-9601(93)90856-u

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Synthesizing Strong-Coupling Kohn-Luttinger Superconductivity in 2D Van der Waals materials

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arXiv:2601.13074Jan 19, 20260 citations

Magnetic and superconductive states in the repulsive Hubbard model

Victor Nikolaevich Popov

Journal of Mathematical SciencesJun 1, 19973 citations

The Kohn-Luttinger (KL) mechanism of pairing, which describes superconductivity emergent from repulsive interactions, typically yields Cooper pairs at high angular-momentum (

\ell > 0

) and extremely low transition temperatures (

T_c

). Here, we reveal an inter-layer s-wave (

\ell=0

) KL superconductivity with greatly elevated

T_c

in a multi-layer Hubbard model, which prototypes stacked two-dimensional (2D) electrons in layered van der Waals materials. By employing determinant quantum Monte Carlo and dynamical mean-field theory simulations, we show that a strong pairing attraction

V^{*}

, without the mediation of collective modes, can emerge between inter-layer electrons in the system. As inter-layer repulsion

U

increases,

V^{*}

evolves from a conventional KL relation of

V^{*} \propto -U^2

, to a linear strong-coupling scaling of

V^{*} \propto -U

, resulting in enhanced superconductivity at large

U

. This strong-coupling KL pairing is robust against changes in lattice geometries and dimensionalities, and it can persist, in the presence of a large remnant Coulomb repulsion

U^{*}

between pairing electrons. Using \textit{ab initio} calculations, we propose a few 2D layered van der Waals materials that can potentially realize and control this unconventional superconductivity.