A squeezed-polaron variational ansatz with generic Gaussian boson-boson correlations captures the correct critical scaling, critical exponents, and scattering phase shifts of the sub-Ohmic spin-boson localization transition.
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A "squeezed polaron" variational wavefunction for the spin boson model
A squeezed-polaron variational ansatz with generic Gaussian boson-boson correlations captures the correct critical scaling, critical exponents, and scattering phase shifts of the sub-Ohmic spin-boson localization transition.