Quantum-classical solvation hydrodynamics: Hamiltonian functionals and dissipation

• URL: http://arxiv.org/abs/2605.05658v1
• Date: Thu, 07 May 2026 04:20:49 GMT
• Title: Quantum-classical solvation hydrodynamics: Hamiltonian functionals and dissipation
• Abstract summary: We propose a mixed quantum-classical hydrodynamic framework to model short-time inertial effects in a quantum solute coupled to a classical polar solvent.<n>We employ the Hamiltonian approach to incorporate consistent backreaction and preserve quantum decoherence beyond standard Ehrenfest dynamics.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose a mixed quantum-classical hydrodynamic framework to model short-time inertial effects in the non-adiabatic evolution of a quantum solute coupled to a classical polar solvent. Drawing upon the work of Burghardt and Bagchi [Chem. Phys. 329 (2006), 343], we employ the Hamiltonian approach to incorporate consistent backreaction and preserve quantum decoherence beyond standard Ehrenfest dynamics. The solvent is treated as an ideal polar fluid and the quantum solute state is correlated to both the position and molecular orientation coordinates of the liquid. This approach retains essential solute-solvent correlations while significantly reducing the computational complexity of previous approaches. We further incorporate dissipative terms to capture both inertial effects and polarization relaxation. After establishing the general setting for non-local dielectric continua, the Marcus local approximation is integrated into the model thereby extending traditional solvation theory to account for collective fluid sloshing on fast timescales.

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