Journal
PHYSICAL REVIEW LETTERS
Volume 123, Issue 26, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.268002
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We present a microscopic theory for the nonequilibrium interfacial tension gamma(g1) of the free interface between gas and liquid phases of active Brownian particles. The underlying square gradient treatment and the splitting of the force balance in flow and structural contributions is general and applies to inhomogeneous nonequilibrium steady states. We find gamma(g1) >= 0, which opposes claims by Bialke et al. [Phys. Rev. Lett. 115,098301 (2015)] and delivers the theoretical justification for the widely observed interfacial stability in active Brownian dynamics many-body simulations.
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