Physics – Condensed Matter
Scientific paper
1995-02-21
Phys. Rev. Lett. 75. 1162 (1995).
Physics
Condensed Matter
4 pages, latex, 2 figures available on request,
Scientific paper
10.1103/PhysRevLett.75.1162
We consider the supercurrent flow through gated mesoscopic semiconductor hetrostructures in which a two-dimensional normal constriction is confined between superconducting electrodes. We show that for these structures the Josephson current, carried by quantized electron modes, can be strongly affected by an electromagnetic field. Photon-assisted Landau-Zener transitions between Andreev bound states in the constriction manifest themselves in one of two ways: (i) If the phase difference between the superconducting elements is fixed a series of reversals in the direction of supercurrent flow occurs (Somersault effect). (ii) If instead the junction is current biased a series of voltage spikes is seen. Both manifestations are a direct consequence of the discrete energy spectrum of the mesoscopic junction. We discuss necessary conditions for the described phenomena to be experimentally observable.
Gorelik Leonid Y.
Shekhter Robert I.
Shumeiko Vitaly S.
Wendin Goran
~Jonson M.
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