Non-equilibrium thermodynamics of intermittent potentials following a telegraphic process

Authors

Mark Nolan P. Confesor ⋅ PH Department of Physics and Premier Research Institute of Science and Mathematics, Mindanao State University − Iligan Institute of Technology

Abstract

Investigations on active systems, resetting protocols and dynamics in biological systems reveals description of observed phenomena as caused by fluctuating forces. In particular, we have observed telegraphic-like dynamics in active forces causing net rotation of ratchet gears in active baths [PRE 101, 022604 (2020)] and in traction forces induced by Physarum polycephalum resulting in active gels [Physica A 603, 127812 (2022)]. A critical step to elucidate the thermodynamics of systems under telegraphic forces is to measure their distance from equilibrium state at least in the steady state regime. We proposed a measure, K*, from a detailed-balance like relation to quantitatively measure this distance. We performed an experiment using a single optical trap to measure the dynamics of a probed particle with the trap being turned ON and OFF at some rate χ [PRE 104, 044609 (2021)]. We found that K*approaches zero at high switching rate corresponding to an equilibrium condition but with an effective spring constant much less than the experimental value. With inspiration from biology, we then consider the dynamics of probe particle in complex intermittent potential field. We performed experiments on a probe particle in an asymmetric quartic potential following a telegraphic process using a double optical tweezer set-up. We found the potential can be made symmetric at some switching rate. Moreover, non-linear dependence of the first passage time for barrier crossing to the switching rate was observed.

About the Speaker

Mark Nolan P. Confesor, Department of Physics and Premier Research Institute of Science and Mathematics, Mindanao State University − Iligan Institute of Technology

Mark Nolan Confesor received his Ph.D. in Physics from the National Central University in Taiwan. He is a Professor of Physics at Mindanao State University − Iligan Institute of Technology, where he served as Chair of the Physics Department and as Dean of the College of Science and Mathematics. He is also the Program Leader of the Premier Research Institute of Science and Mathematics (PRISM) Complex Systems Program and Principal Investigator of the Soft Matter and Biological Physics Laboratory. He served as board member and President of the Samahang Pisika ng Visayas at Mindanao, and as member of the DOST−SEI National Science Council. In 2022 he was recognized by the Metrobank Foundation as an Outstanding Filipino Awardee for Teachers. From personally mentoring students, to conducting trainings and conferences, to allocating resources for research programs and scholarships, Dr. Confesor has helped build a strong and robust scientific culture in the Philippines.

Downloads

Issue

2022: Proceedings of the 40th Samahang Pisika ng Pilipinas Physics Conference

Article ID

SPP-2022-INV-2G-02

Section

Invited Presentations

Published

2022-09-12

How to Cite

[1]

MNP Confesor, Non-equilibrium thermodynamics of intermittent potentials following a telegraphic process, Proceedings of the Samahang Pisika ng Pilipinas 40, SPP-2022-INV-2G-02 (2022). URL: https://proceedings.spp-online.org/article/view/SPP-2022-INV-2G-02.