We investigate the dynamics of single microparticles immersed in water that are driven out of equilibrium in the presence of an additional external colored noise. As a case study, we trap a single polystyrene particle in water with optical tweezers and apply an external electric field with flat spectrum but a finite bandwidth of the order of kHz. The intensity of the external noise controls the amplitude of the fluctuations of the position of the particle, and therefore of its effective temperature. Here we show, in two different nonequilibrium experiments, that the fluctuations of the work done on the particle obey Crooks fluctuation theorem at the equilibrium effective temperature, given that the sampling frequency and the noise cutoff frequency are properly chosen. Our experimental setup can be therefore used to improve the design of microscopic motors towards fast and efficient devices, thus extending the frontiers of nano machinery.
Fluctuation-response relation for a nonequilibrium system with resolved Markovian embedding
Raymond & Beverly Sackler School of Chemistry, Tel Aviv University（特拉维夫大学雷蒙德和贝弗利·萨克勒化学学院）；University of Strasbourg and CNRS, CESQ and ISIS, UMR 7006（斯特拉斯堡大学和法国国家科学研究中心，CESQ和ISIS，UMR 7006）；Raymond & Beverly Sackler School of Physics and Astronomy, Tel Aviv University（特拉维夫大学雷蒙德和贝弗利·萨克勒物理与天文学学院）；Institut für Physik, Humboldt Universiät zu Berlin（柏林洪堡大学物理研究所）
Consistent thermodynamics reconstructed from transitions between nonequilibrium steady-states
Raymond & Beverly Sackler School of Chemistry, Tel Aviv University（特拉维夫大学雷蒙德和贝弗利萨克勒化学学院）；Princeton Center for Theoretical Science, Princeton University（普林斯顿大学普林斯顿理论科学中心）；Departamento de Física, Universidade Federal de Viçosa（维索萨联邦大学物理系）；Department of Physics, Humboldt-Universität zu Berlin（柏林洪堡大学物理系）；Bernstein Center for Computational Neuroscience（伯恩斯坦计算神经科学中心）；University of Strasbourg and CNRS, CESQ and ISIS, UMR 7006（斯特拉斯堡大学及法国国家科学研究中心CESQ和ISIS联合实验室）；Raymond & Beverly Sackler School of Physics and Astronomy, Tel Aviv University（特拉维夫大学雷蒙德和贝弗利萨克勒物理与天文学学院）
Estimating equilibrium ensemble averages using multiple time slices from driven nonequilibrium processes: theory and application to free energies, moments, and thermodynamic length in single-molecule pulling experiments
European Molecular Biology Laboratory（欧洲分子生物学实验室）；Heidelberg University（海德堡大学）；Utrecht University（乌得勒支大学）；Politecnico di Torino（都灵理工大学）；INFN, Sezione di Torino（意大利国家核物理研究所都灵分部）
Mode Coupling Theory for Nonequilibrium Glassy Dynamics of Thermal Self-Propelled Particles
We present a promising mode coupling theory study for the relaxation and glassy dynamics of a system of strongly interacting self-propelled particles, wherein the self-propulsion force is described by Ornstein-Uhlenbeck colored noise and thermal noises are included. Our starting point is an effective Smoluchowski equation governing the distribution function of particle's positions, from which we derive a memory function equation for the time dependence of density fluctuations in nonequilibrium steady states . With the basic assumption of absence of macroscopic currents and standard mode coupli…
Institute for Theoretical Physics, University of Innsbruck（因斯布鲁克大学理论物理研究所）；Institute for Theoretical Physics, University of Cologne（科隆大学理论物理研究所）；Institute for Physics, Johannes Gutenberg University of Mainz（美因茨约翰内斯古腾堡大学物理研究所）
