Flux-periodic resistance oscillations in arrays of superconducting weak links based on InAs-AlSb quantum wells with Nb electrodes

Mason Thomas; Hans-Richard Blank; K. C. Wong; Chanh Nguyen; Herbert Kroemer; Evelyn L. Hu

doi:10.1103/PhysRevB.54.R2311

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Flux-periodic resistance oscillations in arrays of superconducting weak links based on InAs-AlSb quantum wells with Nb electrodes

Mason Thomas, Hans-Richard Blank, K. C. Wong, Chanh Nguyen, Herbert Kroemer, Evelyn L. Hu

DOI 10.1103/PhysRevB.54.R2311 · Physical Review B

T1

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Abstract

InAs-AlSb quantum wells contacted with periodic gratings of superconducting Nb electrodes show Josephson-junction characteristics at low temperatures. When a nonzero resistance is reestablished by a weak magnetic field, the resistance shows a strong component periodic in the magnetic field. At fields above ∼300 μT, the oscillation period corresponds to one flux quantum per grating cell; but in wide arrays (≳40 μm), a frequency doubling takes place at low fields, indicating the formation of a staggered vortex superlattice at twice the lithographic period.

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.	6	Pressure not reported	onset
YBa2Cu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown