Journal
PHYSICAL REVIEW LETTERS
Volume 119, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.119.167701
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Funding
- Centre of Excellence for Engineered Quantum Systems
- Australian Research Council Centre of Excellence [CE110001013]
- Russian Science Foundation [14-42-00044]
- Australian Research Council [DP140100375]
- Australian Government
- Russian Science Foundation [17-42-00003] Funding Source: Russian Science Foundation
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Quantum physics in one spatial dimension is remarkably rich, yet even with strong interactions and disorder, surprisingly tractable. This is due to the fact that the low-energy physics of nearly all onedimensional systems can be cast in terms of the Luttinger liquid, a key concept that parallels that of the Fermi liquid in higher dimensions. Although there have been many theoretical proposals to use linear chains and ladders of Josephson junctions to create novel quantum phases and devices, only modest progress has been made experimentally. One major roadblock has been understanding the role of disorder in such systems. We present experimental results that establish the insulating state of linear chains of submicron Josephson junctions as Luttinger liquids pinned by random offset charges, providing a onedimensional implementation of the Bose glass, strongly validating the quantum many-body theory of onedimensional disordered systems. The ubiquity of such an electronic glass in Josephson-junction chains has important implications for their proposed use as a fundamental current standard, which is based on synchronization of coherent tunneling of flux quanta (quantum phase slips).
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