For the quantum Rabi model, the Levy-Lieb functional is almost fully explicit along the adiabatic connection, and all regular density pairs are uniquely v-representable.
Density-functional theory for the Dicke Hamiltonian
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abstract
A detailed analysis of density-functional theory for quantum-electrodynamical model systems is provided. In particular, the quantum Rabi model, the Dicke model, and a generalization of the latter to multiple modes are considered. We prove a Hohenberg-Kohn theorem that manifests the magnetization and displacement as internal variables, along with several representability results. The constrained-search functionals for pure states and ensembles are introduced and analyzed. We find the optimizers for the pure-state constrained-search functional to be low-lying eigenstates of the Hamiltonian and, based on the properties of the optimizers, we formulate an adiabatic-connection formula. In the reduced case of the Rabi model we can even show differentiability of the universal density functional, which amounts to unique pure-state v-representability.
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quant-ph 1years
2024 1verdicts
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Quantum-Electrodynamical Density-Functional Theory Exemplified by the Quantum Rabi Model
For the quantum Rabi model, the Levy-Lieb functional is almost fully explicit along the adiabatic connection, and all regular density pairs are uniquely v-representable.