Insulating Josephson-junction chains as pinned Luttinger liquids

Cedergren, Karin and Ackroyd, Roger and Kafanov, Sergey and Vogt, Nicolas and Shnirman, Alexander and Duty, Timothy (2017) Insulating Josephson-junction chains as pinned Luttinger liquids. Physical review letters, 119 (16). p. 167701. ISSN 1079-7114

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Abstract

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 one-dimensional 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 sub-micron Josephson junctions as Luttinger liquids pinned by random offset charges, providing a one-dimensional implementation of the Bose glass, strongly validating the quantum many-body theory of one-dimensional 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 synchronisation of coherent tunnelling of flux quanta (quantum phase slips).

Item Type:
Journal Article
Journal or Publication Title:
Physical review letters
Additional Information:
©2017 American Physical Society
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100
Subjects:
ID Code:
88331
Deposited By:
Deposited On:
10 Nov 2017 13:36
Refereed?:
Yes
Published?:
Published
Last Modified:
26 Sep 2020 04:51