Browsing by Subject "Point contacts"

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    Magnetic and electric Aharonov-Bohm effects in nanostructures
    (Elsevier BV, 1996) Kulik, I. O.
    The paper reviews and extends the magnetic Aharonov-Bohm effect (persistent current, resistance oscillation) in normal-metal rings including spin-independent and spin-dependent hopping, Zeeman splitting, magnetic textures and wheels, ring rotation and weak coupling, as well as the electric Aharonov-Bohm effect ("persistent charge") in small metallic contacts. We then discuss dynamical screening effects in a surface charge in a metal. Energy dissipation due to motion of the surface charge has a singularity at the velocity of motion equal to the phonon propagation velocity. Surface image of an external charge inside the metal is strongly distorted at the velocity of motion larger than the Fermi velocity.
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    ItemOpen Access
    Nonlinear four‐terminal microstructures: A hot‐spot transistor?
    (American Institute of Physics, 1994) Kulik, I. O.
    Four-terminal microcontacts between metallic electrodes develop nonlinear current-voltage dependencies both in the source and control channels as well as between the channels. Theory is presented of the nonlinearity caused by the reabsorption of nonequilibrium phonons emitted in the contact by injected electrons. Temperature of the lattice due to heating by the current is of the order T approximately eV/4, which results in substantial increase of the resistance both in the bias direction and in the direction perpendicular to the bias. Performance characteristics of such a device at low temperature compared to the Debye temperature are quite promising for frequencies below 10(9) Hz.
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    The self-consistent calculation of the edge states at quantum Hall effect (QHE) based Mach-Zehnder interferometers (MZI)
    (Elsevier B.V., 2008) Siddiki, A.; Kavruk, A. E.; Öztürk, T.; Atav, U.; Şahin, M.; Hakioǧlu T.
    The spatial distribution of the incompressible edge states (IES) is obtained for a geometry which is topologically equivalent to an electronic Mach-Zehnder interferometer, taking into account the electron-electron interactions within a Hartree type self-consistent model. The magnetic field dependence of these IES is investigated and it is found that an interference pattern may be observed if two IES merge or come very close, near the quantum point contacts. Our calculations demonstrate that, being in a quantized Hall plateau does not guarantee observing the interference behavior.