Typeset Using Revt E X

نویسندگان

  • P. Lecheminant
  • B. Bernu
  • C. Lhuillier
چکیده

J 1 − J 2 quantum Heisenberg antiferromagnet on the triangular lattice: a group symmetry analysis of order by disorder. Abstract On the triangular lattice, for J 2 /J 1 between 1/8 and 1, the classical Heisen-berg model with first and second neighbor interactions presents four-sublattice ordered ground-states. Spin-wave calculations of Chubukov and Jolicoeur [9] and Korshunov [10] suggest that quantum fluctuations select amongst these states a colinear two-sublattice order. From theoretical requirements, we develop the full symmetry analysis of the low lying levels of the spin-1/2 Hamil-tonian in the hypotheses of either a four or a two-sublattice order. We show on the exact spectra of periodic samples (N = 12, 16 and 28) how quantum fluctuations select the colinear order from the four-sublattice order.

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تاریخ انتشار 1995