The Experts below are selected from a list of 51 Experts worldwide ranked by ideXlab platform

Diego Porras - One of the best experts on this subject based on the ideXlab platform.

  • Quantum Chaotic Fluctuation-dissipation theorem: Effective Brownian motion in closed quantum systems.
    Physical review. E, 2019
    Co-Authors: Charlie Nation, Diego Porras
    Abstract:

    We analytically describe the decay to equilibrium of generic observables of a nonintegrable system after a perturbation in the form of a random matrix. We further obtain an analytic form for the time-averaged Fluctuations of an observable in terms of the rate of decay to equilibrium. Our result shows the emergence of a Fluctuation-dissipation theorem corresponding to a classical Brownian process, specifically, the Ornstein-Uhlenbeck process. Our predictions can be tested in quantum simulation experiments, thus helping to bridge the gap between theoretical and experimental research in quantum thermalization. We test our analytic results by exact numerical experiments in a spin chain. We argue that our Fluctuation-dissipation relation can be used to measure the density of states involved in the nonequilibrium dynamics of an isolated quantum system.

Charlie Nation - One of the best experts on this subject based on the ideXlab platform.

  • Quantum Chaotic Fluctuation-dissipation theorem: Effective Brownian motion in closed quantum systems.
    Physical review. E, 2019
    Co-Authors: Charlie Nation, Diego Porras
    Abstract:

    We analytically describe the decay to equilibrium of generic observables of a nonintegrable system after a perturbation in the form of a random matrix. We further obtain an analytic form for the time-averaged Fluctuations of an observable in terms of the rate of decay to equilibrium. Our result shows the emergence of a Fluctuation-dissipation theorem corresponding to a classical Brownian process, specifically, the Ornstein-Uhlenbeck process. Our predictions can be tested in quantum simulation experiments, thus helping to bridge the gap between theoretical and experimental research in quantum thermalization. We test our analytic results by exact numerical experiments in a spin chain. We argue that our Fluctuation-dissipation relation can be used to measure the density of states involved in the nonequilibrium dynamics of an isolated quantum system.

Dan Huang - One of the best experts on this subject based on the ideXlab platform.

  • Noise Correlation Induced Synchronization in a Mutualism Ecosystem
    arXiv: Other Quantitative Biology, 2007
    Co-Authors: Wei-rong Zhong, Yuan-zhi Shao, Meng-jie Bie, Dan Huang
    Abstract:

    Understanding the cause of the synchronization of population evolution is an important issue for ecological improvement. Here we present a Lotka-Volterra-type model driven by two correlated environmental noises and show, via theoretical analysis and direct simulation, that noise correlation can induce a synchronization of the mutualists. The time series of mutual species exhibit a Chaotic-like Fluctuation, which is independent to the noise correlation, however, the Chaotic Fluctuation of mutual species ratio decreases with the noise correlation. A quantitative parameter defined for characterizing Chaotic Fluctuation provides a good approach to measure when the complete synchronization happens.

He Zhen-hui - One of the best experts on this subject based on the ideXlab platform.

  • Synchronization in a Mutualism Ecosystem Induced by Noise Correlation
    Communications in Theoretical Physics, 2008
    Co-Authors: Zhong Wei-rong, Shao Yuan-zhi, Bie Meng-jie, He Zhen-hui
    Abstract:

    Understanding the cause of the synchronization of population evolution is an important issue for ecological improvement. Here we present a Lotka–Volterra-type model driven by two correlated environmental noises and show, via theoretical analysis and direct simulation, that noise correlation can induce a synchronization of the mutualists. The time series of mutual species exhibit a Chaotic-like Fluctuation, which is independent of the noise correlation, however, the Chaotic Fluctuation of mutual species ratio decreases with the noise correlation. A quantitative parameter defined for characterizing Chaotic Fluctuation provides a good approach to measure when the complete synchronization happens.

Pierre-francois Brevet - One of the best experts on this subject based on the ideXlab platform.

  • Second harmonic generation monitoring of nitric acid extraction by a monoamide at the water-dodecane interface
    Physical Chemistry Chemical Physics, 2011
    Co-Authors: Gaelle Martin-gassin, Pierre-marie Gassin, Laurent Couston, Emmanuel Benichou, Olivier Diat, Pierre-francois Brevet
    Abstract:

    The interface dynamic properties of a monoamide extractant with potential for application to the front end of the nuclear cycle and to waste treatment are examined by second harmonic generation. The results are compared with bulk nitric ion titration and surface pressure measurements. SH static studies show the extractant reaching the interface and accurately match the IFT measurements. The main feature of the SH dynamic studies is a Chaotic Fluctuation period, strongly related to intense extraction. Fluctuations are a signature of the interface behaviour during the extraction process. Vertical development of the interface, often called protrusion, remains the most probable origin of the measured Fluctuation. Additionally, interfacial measurements show a non-monotonic lag time during extraction, probably related to cooperative effects not observed in the bulk at the working concentration. Such mutual behaviour could be a supplementary prerequisite for the ion transfer across this liquid-liquid interface.