Sample-Specific Conductance Fluctuations Modulated by the Superconducting Phase

S. G. den Hartog; C. M. A. Kapteyn; B. J. van Wees; T. M. Klapwijk; W. van der Graaf; G. Borghs

doi:10.1103/PhysRevLett.76.4592

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Sample-Specific Conductance Fluctuations Modulated by the Superconducting Phase

S. G. den Hartog, C. M. A. Kapteyn, B. J. van Wees, T. M. Klapwijk, W. van der Graaf, G. Borghs

DOI 10.1103/PhysRevLett.76.4592 · Physical Review Letters

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Abstract

We have studied sample-specific conductance fluctuations tuned by the phase difference between superconducting boundaries, using a two-dimensional electron gas as the phase-coherent normal conductor. In low magnetic fields, h/2e periodic conductance oscillations due to phase-conjugated Andreev reflections are observed with an amplitude δG≃0.10e2/h at T=50mK. These oscillations are suppressed by a flux of approximately h/e through the interference region. For larger magnetic fields, sample-specific h/2e conductance oscillations are found with δG≃0.005e2/h. No indication is found for an intrinsic h/4e periodic superconductor-modified weak localization contribution.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.5	Pressure not reported	unknown