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[Lecture] Prethermalization dynamics in spin chains with confinement
Mar. 21, 2023
Speaker: Michael Knap (Technical University of Munich)

Time: 16:00-17:00 pm, March 21, 2023, GMT+8

Venue: Zoom Meeting ID: 963 5796 8034 Password: 125125


Unconventional nonequilibrium phases with restricted correlation spreading and slow entanglement growth have been proposed to emerge in systems with confined excitations, calling their thermalization dynamics into question. Here, we show that in confined systems the thermalization dynamics after a quantum quench instead exhibits multiple stages with well separated time scales. As an example, we consider the confined Ising spin chain, in which domain walls in the ordered phase form bound states reminiscent of mesons. The system first relaxes towards a prethermal state, described by a Gibbs ensemble with conserved meson number. The prethermal state arises from rare events in which mesons are created in close vicinity, leading to an avalanche of scattering events. Only at much later times a true thermal equilibrium is achieved in which the meson number conservation is violated by a mechanism akin to the Schwinger effect. The discussed prethermalization dynamics is directly relevant to generic one-dimensional, many-body systems with confined excitations.

Reference: Birnkammer, Bastianello, MK, Nature Communications 13, 7663 (2022)

Source: School of Physcis