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DLRO, ODLRO and superfluidity

  • Excitonic Condensation
  • Conference paper
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Physics of Highly Excited States in Solids

Part of the book series: Lecture Notes in Physics ((LNP,volume 57))

Abstract

A necessary condition for superfluidity is discussed in connection with the classification of the long-range orders, DLRO and ODLRO, and it is concluded that it can take place only in systems with ODLRO. Based on this consideration, the possibility of superfluidity in a system of Frenkel excitons is examined. It is shown that it cannot occur in the excitonic phase, but that it can occur in the Bose-condensed phase of high-density excitons as a transient phenomenon.

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Reference

  1. C. N. Yang: Rev. mod. Phys. 34 (1962), 694.

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  4. We may generalize the definition of ODLRO to general conserved quantities. For instance, the order of the spin system with the Hamiltonian (4) is off-diagonal with respect to the z-component of spins which is the conserved quantity in this system. In this sense ODLRO is a necessary condition for superfluidity.

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  5. The possibility of superfluidity in this system was discussed by S. Nakajima; preprint. See also Nakajima's paper in this proceedings.

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  10. See also Hanamura's and Haug's papers in this proceedings.

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Authors and Affiliations

  1. Department of Physics, Nagoya University, Nagoya, Japan

    Yosuke Nagaoka

Authors
  1. Yosuke Nagaoka
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© 1976 Springer-Verlag

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Nagaoka, Y. (1976). DLRO, ODLRO and superfluidity. In: Physics of Highly Excited States in Solids. Lecture Notes in Physics, vol 57. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-07991-2_85

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  • DOI: https://doi.org/10.1007/3-540-07991-2_85

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-07991-0

  • Online ISBN: 978-3-540-37975-1

  • eBook Packages: Springer Book Archive

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