Quantum multicritical point in the two- and three-dimensional random transverse-field Ising model

Quantum multicritical points (QMCPs) emerge at the junction of two or more quantum phase transitions due to interplay disparate fluctuations, leading novel universality classes. While critical have been well characterized, our understanding QMCPs is much limited, even though they might be less elusive study experimentally than points. Here, we characterize QMCP an interacting heterogeneous system in and three dimensions, ferromagnetic random transverse-field Ising model (RTIM). The RTIM emerges both geometric studied here numerically by strong disorder renormalization group method. found exhibit ultraslow, activated dynamic scaling, governed infinite fixed point. This ensures that obtained exponents tend exact values large scales, while also being universal---i.e., independent form disorder---providing a solid theoretical basis for future experiments.