3 papers
cond-mat.stat-mech2026
Symmetry Breaking of Current Response in Disordered Exclusion Processes
Issei Sakai, Takuma Akimoto
The bias-reversal symmetry -- where reversing an external bias inverts the current without changing its magnitude -- is a hallmark of nonequilibrium transport. While this property…
cond-mat.soft2026
Density-Independent transient caging in the high-density phase of motility-induced phase separation
Toranosuke Umemura, Issei Sakai, Takuma Akimoto
We investigate the nonequilibrium dynamics of active matter using a two-dimensional active Brownian particles model. In these systems, self-propelled particles undergo motility-ind…
cond-mat.stat-mech2025
Unexpected Effects of Disorder on Current Fluctuations in the Symmetric Simple Exclusion Process
Issei Sakai, Takuma Akimoto
We explore how the disorder impacts the current fluctuations in the symmetric simple exclusion process (SSEP) within a heterogeneous environment. First, we analyze the SSEP with a…