Phase coherent electron transport in asymmetric cross-like Andreev
interferometers
release_rev_be88c5ba-661b-452c-94ba-58055a9e238c
by
Pavel E. Dolgirev,
Mikhail S. Kalenkov,
Andrei E. Tarkhov,
Andrei
D. Zaikin
2019
Abstract
We present a detailed theoretical description of quantum coherent electron
transport in voltage-biased cross-like Andreev interferometers. Making use of
the charge conjugation symmetry encoded in the quasiclassical formalism, we
elucidate a crucial role played by geometric and electron-hole asymmetries in
these structures. We argue that a non-vanishing Aharonov-Bohm-like contribution
to the current I_S flowing in the superconducting contour may develop only in
geometrically asymmetric interferometers making their behavior qualitatively
different from that of symmetric devices. The current I_N in the normal
contour ā along with I_Sā is found to be sensitive to phase-coherent
effects thereby also acquiring a 2Ļ-periodic dependence on the Josephson
phase. In asymmetric structures this current develops an odd-in-phase
contribution originating from electron-hole asymmetry. We demonstrate that both
phase dependent currents I_S and I_N can be controlled and manipulated by
tuning the applied voltage, temperature and system topology, thus rendering
Andreev interferometers particularly important for future applications in
modern electronics.
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1906.07305v1
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