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- W1672531721 abstract "A generalized trial wave function termed as the ``multi-${D}_{1}$ ansatz'' has been developed to study the ground state of the spin-boson model with simultaneous diagonal and off-diagonal coupling in the sub-Ohmic regime. Ground-state properties including energy and spin polarization are investigated, and the results are consistent with those from exact diagonalization and density matrix renormalization group approaches for the cases involving two oscillators and two baths described by a continuous spectral density function. Breakdown of the rotational and parity symmetries along the continuous quantum phase transition separating the localized phase from the critical phase has been uncovered. Moreover, the phase boundary is determined accurately with the corresponding rotational- and parity-symmetry parameters. A critical value of the spectral exponent ${s}^{*}=0.49(1)$ is predicted in the weak coupling limit, which is in agreement with the mean-field prediction of $1/2$, but much smaller than the earlier literature estimate of $0.75(1)$." @default.
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- W1672531721 date "2015-05-19" @default.
- W1672531721 modified "2023-10-16" @default.
- W1672531721 title "Symmetry and the critical phase of the two-bath spin-boson model: Ground-state properties" @default.
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- W1672531721 doi "https://doi.org/10.1103/physrevb.91.195129" @default.
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