Symmetries shape the current in ratchets induced by a bi-harmonic force
نویسندگان
چکیده
Niurka R. Quintero, ∗ José A. Cuesta, † and Renato Alvarez-Nodarse ‡ Departamento de F́ısica Aplicada I, E. U. P., Universidad de Sevilla, Virgen de África 7, E-41011, Sevilla, Spain Grupo Interdisciplinar de Sistemas Complejos (GISC), Departamento de Matemáticas, Universidad Carlos III de Madrid, avda de la Universidad 30, E-28911 Leganés, Madrid, Spain Departamento de Análisis Matemático, Universidad de Sevilla, apdo 1160, E-41080, Sevilla, Spain (Dated: March 19, 2010)
منابع مشابه
Symmetries shape the current in ratchets induced by a biharmonic driving force.
Equations describing the evolution of particles, solitons, or localized structures, driven by a zero-average, periodic, external force, and invariant under time reversal and a half-period time shift, exhibit a ratchet current when the driving force breaks these symmetries. The biharmonic force f(t)=1 cos(qomegat+phi1)+2 cospomegat+phi2) does it for almost any choice of vphi1 and phi2, provided ...
متن کاملControlling the ratchet effect through the symmetries of the systems: Application to molecular motors
We discuss a novel generic mechanism for controlling the ratchet effect through the breaking of relevant symmetries. We review previous works on ratchets where directed transport is induced by the breaking of standard temporal symmetries f(t)=-f(t+T/2) and f(t)=f(-t) (or f(t)=-f(-t)). We find that in seemingly unrelated systems the average velocity (or the current) of particles (or solitons) ex...
متن کاملDesign and Construction of a Sensorless Circuit for Brushless DC Motor using Third Harmonic back Electromotive Force
In this paper the method of sensorless startup of direct current brushless motor using third harmonic back Electromotive Force (EMF) and motor startup using microcontroller for pulse width modulation, power switch control and motor output analysis is presented which renders RPM control and high speed achievement for motor. The microcontroller is used for processor and MOSFETs are used for power...
متن کاملPerturbative Approach to Calculating the Correlation Function of bi-isotropic Metamaterials
A bi-isotropic magneto-electric metamaterials is modeled by two independent reservoirs. The reservoirs contain a continuum of three dimensional harmonic oscillators, which describe polarizability and magnetizability of the medium. The paper aimed to investigate the effect of electromagnetic field on bi-isotropic. Starting with a total Lagrangian and using Euler-Lagrange equation, researcher cou...
متن کاملCoherent ratchets in driven Bose-Einstein condensates.
We study the response of a Bose-Einstein condensate to an unbiased periodic driving potential. By controlling the space and time symmetries of the driving we show how a directed current can be induced, producing a coherent quantum ratchet. Weak driving induces a regular behavior, and space and time symmetries must both be broken to produce a current. For strong driving, the behavior becomes cha...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2010