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Condensation of Rodlike Counterions on a Charged Cylinder
Cha Minryeong,Ro Sunghan,Kim Yong Woon 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.9
We study the condensations of dumbbell-like counterions onto an oppositely charged cylinder at weak and strong electrostatic coupling strengths. Performing extensive Monte Carlo simulations, we show that the condensation characteristics of the dumbbell ions can be understood by viewing dumbbell ions of length d as point ions with an effective valency depending on the radial distance r from the cylinder's axis. In terms of the condensation behavior, dumbbell ions behave as two independent point ions if r ≪ d, but act as a single point ion with twofold valency when r ≫ d. Such a distance-dependent effective valency as a characteristic of ions of extended structures explains a unique feature in the condensed counterion fraction and heat capacity at both weak and strong coupling strengths.
Yeree Kang,Juyeon Yi,Sunghan Ro 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.9
We examine energy exchange between two quantum systems, which are initially in canonical equilibrium states at different temperatures, through a coupling that allows particle transfer. We find the entropy production and information-theoretic quantities that govern the energy exchange and discuss the difference from when the coupling preserves the number of particles in each system. We take a specific system of spinless fermions and exemplify the role of coupling, the aspect of energy exchange, and the involved entropy productions.