The paper argues that the spin-boson ground state always has definite parity and no quantum phase transition exists, but its key step misuses the unitary boson parity operator.
Vojta et al., Phys
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Non-degenerate Ground State of the Spin-Boson Model under Abelian Diagonalization
The paper argues that the spin-boson ground state always has definite parity and no quantum phase transition exists, but its key step misuses the unitary boson parity operator.