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- W2006289986 abstract "We study the low-temperature behavior of a quantum nonlinear σ model (NLσM) in two space dimensions. This model is considered to describe the long-wavelength limit of the two-dimensional Heisenberg antiferromagnet. The correlation function is calculated in a 1/n expansion. We find a crossover between classical and quantum regimes as the temperature is reduced. Introducing fermion fields in NLσM, we propose a model of the doped antiferromagnet. It is shown that doped holes extremely reduce the correlation length ξ. We have a critical hole concentration δc; if δ>δc, ξ becomes independent of temperature." @default.
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- W2006289986 title "Spin correlation in fermion-doped nonlinear sigma model" @default.
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- W2006289986 doi "https://doi.org/10.1016/0304-8853(92)90915-b" @default.
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