Coupled critical quantum Ising layers map to the quantum Ashkin-Teller model, yielding a 1D critical line with continuously varying exponent nu and 2D multicritical points with effective O(2) symmetry.
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Quantum corrections to dissipative semiclassical dynamics are set by zero-point energy of fluctuations evaluated at the classical underdamped frequency in the low-temperature weak-damping regime.
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Stacked quantum Ising systems and quantum Ashkin-Teller model
Coupled critical quantum Ising layers map to the quantum Ashkin-Teller model, yielding a 1D critical line with continuously varying exponent nu and 2D multicritical points with effective O(2) symmetry.
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Quantum effective action for dissipative semiclassical dynamics
Quantum corrections to dissipative semiclassical dynamics are set by zero-point energy of fluctuations evaluated at the classical underdamped frequency in the low-temperature weak-damping regime.