Relaxation Shortcuts through Boundary Coupling

Gianluca Teza, Ran Yaacoby, Oren Raz

Research output: Contribution to journalArticlepeer-review


When a hot system cools down faster than an equivalent cold one, it exhibits the Mpemba effect (ME). This counterintuitive phenomenon was observed in several systems including water, magnetic alloys, and polymers. In most experiments the system is coupled to the bath through its boundaries, but all theories so far assumed bulk coupling. Here we build a general framework to characterize anomalous relaxations through boundary coupling, and present two emblematic setups: a diffusing particle and an Ising antiferromagnet. In the latter, we show that the ME can survive even arbitrarily weak couplings.

Original languageEnglish
Article number017101
JournalPhysical Review Letters
Issue number1
StatePublished - 7 Jul 2023

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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