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Inspired by non-Hermitian physics, Li et al. (Science 364, 170-173)theoretically predicted and experimentally demonstrated a stationarytemperature profile in a diffusive heat transfer system - seemingly indicatingthat heat "stops" diffusing. By analogy to the wave physics framework, themotionless and moving temperature profiles are manifestations of theanti-parity-time APT symmetry and symmetry breaking states, respectively. Theirexperimental setup consists of two thermally coupled rings rotating in theopposite direction. At a particular rotation speed, known as the exceptionalpoint, the APT symmetry of the system changes, resulting in the temperatureprofile switching between stationary and moving states. In fact, this seeminglyunusual and exotic behavior can be elegantly captured and predicted using aconventional heat transfer framework with similarity and scaling analysis. Inthis work, we show the system behavior can be characterized into three zones bytwo widely-used dimensionless parameters on a regime map. The exceptionalpoint, discovered using wave physics, is located precisely on the zone boundaryon the regime map, indicating a balance between the contribution of thermalcoupling and mechanical motion. Furthermore, the observed cessation of thermaldiffusion is merely a result of the long diffusion time constant of theexperimental setup. The unfamiliarity of concepts in another scientific fieldas well as the remarkable equivalence of the two points of view prompts thisin-depth discussion of the analogy between wave physics and heat transfer. Webelieve that this work can help bridge the gap and promote new developments inthe two distinctly different disciplines.

Understanding anti-parity-time symmetric systems with a conventional  heat transfer framework -- comment on "Anti-parity-time symmetry in diffusive  systems"