Temporal Anti-Parity-Time Symmetry: Extending Non-Hermitian Physics to Time-Domain Dynamics in Thermal Diffusion
Abstract
Parity-time and anti-parity-time symmetries, originally formulated in the context of non-Hermitian quantum mechanics, have now been experimentally realized across diverse physical platforms, including photonic, wave-guiding, acoustic, and mechanical systems, as well as systems operating near exceptional points. While the active manipulation of these symmetries has been well explored in wave-based systems, their implementations in diffusive physics have long remained predominantly confined to static phases, where systems are locked in a fixed symmetric or symmetry-broken configuration due to their invariant structural parameters. Bridging this gap, recent work has introduced and verified the concept of temporal anti-parity-time symmetry, demonstrating that energy transport in diffusive media can be actively programmed in the time domain.
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