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Updated: Apr 16, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
Published on: December 3, 2013
Tuning locality of pair coherence in graphene-based Andreev interferometers
Minsoo Kim1, Dongchan Jeong1, Gil-Ho Lee1
1Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea.
Abstract:
We report on gate-tuned locality of superconductivity-induced phase-coherent magnetoconductance oscillations in a graphene-based Andreev interferometer, consisting of a T-shaped graphene bar in contact with a superconducting Al loop. The conductance oscillations arose from the flux change through the superconducting Al loop, with gate-dependent Fraunhofer-type modulation of the envelope. We confirm a transitional change in the character of the pair coherence, between local and nonlocal, in the same device as the effective length-to-width ratio of the device was modulated by tuning the pair-coherence length ξT in the graphene layer.
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