Phys. Rev. Lett. 78, 2632–2635 (1997)Dissipation-Driven Superconductor-Insulator Transition in a Two-Dimensional Josephson-Junction ArrayReceived 26 November 1996; published in the issue dated 31 March 1997 We have fabricated a two-dimensional array of Josephson junctions within 100 nm of a two-dimensional electron gas (2DEG) in a GaAs/AlGaAs heterostructure. The screening provided by the 2DEG causes the array to show superconducting behavior despite a large junction resistance. Varying the resistance per square of the 2DEG changes the dissipation in the electrodynamic environment of the array independently of any other parameters in the system. As the resistance increases, the current-voltage characteristics of the array change from superconducting to insulating in character. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.78.2632
DOI:
10.1103/PhysRevLett.78.2632
PACS:
74.50.+r, 05.30.-d, 74.25.Fy, 74.40.+k
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