Spin Dynamics for the t-J Model
Abstract
The spin dynamics at the finite temperature for the t-J model in the underdoped and optimal doped regimes is studied within the fermion-spin theory. It is shown that the dynamical spin structure factor spectrum at the antiferromagnetic wave vector Q=(π,π) are separated as low- and high-frequency parts, respectively, but the high-frequency part is suppressed in the dynamical susceptibility spectrum ''(Q,ω), while the low-frequency part is the temperature dependent, which are in qualitative agreement with the experiments and numerical simulations.
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