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APS » Journals » Phys. Rev. Lett. » Volume 88 » Issue 22
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Phys. Rev. Lett. 88, 227005 (2002) [4 pages]

Pairing of Cooper Pairs in a Fully Frustrated Josephson-Junction Chain

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Benoit Douçot1,2 and Julien Vidal3
1Laboratoire de Physique de la Matière Condensée, CNRS UMR 8551, École Normale Supérieure, 24, rue Lhomond, 75231 Paris Cedex 05, France
2Laboratoire de Physique Théorique et Hautes Énergies, CNRS UMR 7589, Universités Paris 6 et 7, 4, place Jussieu, 75252 Paris Cedex 05, France
3Groupe de Physique des Solides, CNRS UMR 7588, Universités Paris 6 et 7, 2, place Jussieu, 75251 Paris Cedex 05, France

Received 7 February 2002; published 17 May 2002

We study a one-dimensional Josephson-junction chain embedded in a magnetic field. We show that, when the magnetic flux per elementary loop equals half the superconducting flux quantum φ0 = h/2e, a local Z2 symmetry arises. This symmetry is responsible for a nematic Luttinger liquid state associated with bound states of Cooper pairs. We analyze the phase diagram and discuss some experimental possibilities to observe this exotic phase.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.227005
DOI:
10.1103/PhysRevLett.88.227005
PACS:
74.50.+r, 71.10.Fd, 71.23.An, 73.20.Jc
 
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