Perturbative description of high-$T_c$ superconductivity in the Hubbard model via unitary transformation and classical spins

Kirill Alpin

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arXiv · 2403.09765

Perturbative description of high-$T_c$ superconductivity in the Hubbard model via unitary transformation and classical spins

Kirill Alpin

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Abstract

A unitary transformation is applied to the Hubbard model, which maps the Hubbard interaction to a single particle term. The resulting Hamiltonian consists of unconstrained fermions, which is then mapped to a Hamiltonian of spinless fermions coupled to pseudospins. The fermions are integrated out using second order perturbation theory in $1/U$, resulting in an effective spin Hamiltonian. An order parameter is identified, stabilizing d-wave superconductivity. The groundstate energy of classical spin configurations is minimized at a finite value of this order parameter after a critical chemical potential, resulting in d-wave superconductivity at non-zero doping. This suggests, that the onset of high-$T_c$ superconductivity is governed by the groundstate of a classical spin system.

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Kirill Alpin. 2024-03-14. Perturbative description of high-$T_c$ superconductivity in the Hubbard model via unitary transformation and classical spins. https://arxiv.org/abs/2403.09765

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