Localization, escape rate and delocalization in kinked ratchet potentials
Author(s)
Choi, Sang Hyun
DownloadFull printable version (6.590Mb)
Other Contributors
Massachusetts Institute of Technology. Department of Physics.
Advisor
Alfredo Alexander-Katz and Jeremy England.
Terms of use
Metadata
Show full item recordAbstract
The particle localization in ratchet potentials with segments of reverse directions, or kinked ratchets, is computationally studied. Kinks localize a particle on on-off pulsating ratchet potentials, forming stable points in the effective potential. Analogous Kramers rate for transition between kinks is derived through simulations under different values of parameters defining the system. Adding tilting to the system with a proper choice of tilting frequency induces stochastic resonance. Delocalization of a particle is observed in the resonant activation regime.
Description
Thesis: S.B., Massachusetts Institute of Technology, Department of Physics, 2015. Cataloged from PDF version of thesis. Includes bibliographical references (pages 45-46).
Date issued
2015Department
Massachusetts Institute of Technology. Department of PhysicsPublisher
Massachusetts Institute of Technology
Keywords
Physics.