3,421 research outputs found
Particle diode: Rectification of interacting Brownian ratchets
Transport of Brownian particles interacting with each other via the Morse
potential is investigated in the presence of an ac driving force applied
locally at one end of the chain. By using numerical simulations, we find that
the system can behave as a particle diode for both overdamped and underdamped
cases. For low frequencies, the transport from the free end to the ac acting
end is prohibited, while the transport from the ac acting end to the free end
is permitted. However, the polarity of the particle diode will reverse for
medium frequencies. There exists an optimal value of the well depth of the
interaction potential at which the average velocity takes its maximum. The
average velocity decreases monotonically with the system size by
a power law .Comment: 7 pages, 9 figure
Electron self-energy and effective mass in a single heterostructure
In this paper, we investigate the electron self-energy and effective mass in
a single heterostructure using Green-function method. Numerical calculations of
the electron self-energy and effective mass for GaAs/AlAs heterostructure are
performed. The results show that the self energy (effective mass) of electron,
which incorporate the energy of electron coupling to interface-optical phonons
and half three-dimension LO phonons, monotonically increase(decrease) from that
of interface polaron to that of 3D bulk polaron with the increase of the
distance between the position of the electron and interface.Comment: 10 pages, 2 figure
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