Phase coherent electron transport in asymmetric cross-like Andreev interferometers
Autor: | Pavel E. Dolgirev, Andrei E. Tarkhov, Mikhail S. Kalenkov, Andrei D. Zaikin |
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Rok vydání: | 2019 |
Předmět: |
Physics
Superconductivity Josephson phase Condensed Matter - Superconductivity media_common.quotation_subject FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Electron transport chain Asymmetry System topology Superconductivity (cond-mat.supr-con) Quantum mechanics 0103 physical sciences Astronomical interferometer 010306 general physics 0210 nano-technology Quantum Voltage media_common |
DOI: | 10.48550/arxiv.1906.07305 |
Popis: | 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 -- along with $I_S$ -- is found to be sensitive to phase-coherent effects thereby also acquiring a $2\pi$-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. |
Databáze: | OpenAIRE |
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