Aug 17, 1999
Spectrum of Single-Particle and Collective Low-Energy Excitations and Spontaneous Dimer Order in the J1-J2 Model
Valeri Kotov, (Univ of Florida)
We overview some recent work and present new results on
the ground state properties and the spectrum of
excitations of the two-dimensional frustrated Heisenberg
antiferromagnet. Spontaneous dimer order is present in the
quantum disordered phase of this model.
We study the stability and
analyze the structure of the spectrum, including the two-particle
singlet excitation mode throughout the disordered phase, as well as
in the vicinity of the Néel critical point.
The variation of the dimer order parameter is also given, and it is
argued that near the critical point it reflects the presence of
the low-energy singlet bound state.
cond-mat/9912228, cond-mat/9907178, cond-mat/9903154
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