Fast Josephson vortex ratchet made of intrinsic Josephson junctions in Bi2Sr2CaCu2O8

H. B. Wang; B. Y. Zhu; C. Gürlich; M. Ruoff; S. Kim; T. Hatano; B. R. Zhao; Z. X. Zhao; E. Goldobin; D. Koelle; R. Kleiner

doi:10.1103/PhysRevB.80.224507

Fast Josephson vortex ratchet made of intrinsic Josephson junctions in Bi2Sr2CaCu2O8

H. B. Wang, B. Y. Zhu, C. Gürlich, M. Ruoff, S. Kim, T. Hatano, B. R. Zhao, Z. X. Zhao, E. Goldobin, D. Koelle, R. Kleiner

DOI 10.1103/PhysRevB.80.224507 · Physical Review B

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Abstract

We demonstrate the operation of a deterministic fluxon ratchet made of a stack of 30 intrinsic Bi2Sr2CaCu2O8 Josephson junctions. The ratchet has the shape of a gear with 20 asymmetric teeth (periods). It produces a rectified voltage of about 100 μV at a 12 GHz drive frequency. The effect of coupling between intrinsic junctions, i.e., the mode of fluxon motion for ratchet operation, has been studied within the framework of the two-dimensional coupled sine-Gordon equations. Further, we used low-temperature scanning laser microscopy to demonstrate that voltage rectification indeed is due to directed fluxon motion, in agreement with numerical simulations.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	88	Pressure not reported	unknown