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Volumn 41, Issue 7, 1990, Pages 4552-4569

Ground-state correlations of quantum antiferromagnets: A Green-function Monte Carlo study

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Indexed keywords


EID: 25544467191     PISSN: 01631829     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevB.41.4552     Document Type: Article
Times cited : (238)

References (51)
  • 4
    • 84927829634 scopus 로고    scopus 로고
    • (unpublished).
  • 8
  • 11
    • 84927829633 scopus 로고    scopus 로고
    • The singlet nature of the ground state does not preclude LRO. Although no direction is picked out by the ground state, the spin-spin correlation function can be finite at large distances, implying a net staggered magnetization.
  • 21
    • 84927829632 scopus 로고    scopus 로고
    • D. M. Ceperley and M. H. Kalos, in Monte Carlo Methods in Statistical Physics, edited by K. Binder (Springer-Verlag, Berlin, 1979); K. E. Schmidt and M. H. Kalos, in Applications of the Monte Carlo Method in Statistical Physics, 2nd ed., edited by K. Binder (Springer-Verlag, Berlin, 1984).
  • 26
    • 84927829631 scopus 로고    scopus 로고
    • See Sec. V for the effects of other boundary conditions.
  • 27
    • 84927829630 scopus 로고    scopus 로고
    • It is easy to see that even though the kinetic energy operator has a positive sign, acquires a negative expectation value from the alternating nature of the phase of the wave function.
  • 35
    • 84927829629 scopus 로고    scopus 로고
    • S. E. Koonin, Computational Methods (Addison-Wesley, Reading, Mass., 1986); M. H. Kalos and P. A. Whitlock, Monte Carlo Methods: The Basics (Wiley, New York, 1986).
  • 42
    • 84927829628 scopus 로고    scopus 로고
    • Note that in (2.2) the operators b and bdag anticommute at a site that is equivalent to a hard-core condition. In momentum space this gives [bkvec ,bk vec prime dag] = δ kvec,kvecprime -2n ( k vec - k vec prime ), which is modified from the usual commutation relation for bosons. However, is also possible to treat the bosons as ordinary species and include the hard-core condition in the commutation relations as an infinitely repulsive potential. This on-site potential will also commute with ρ ( q vec ) and will not contribute to the f-sum rule.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.