Xikun Hu, Wenlin Liu, et al.
IEEE J-STARS
As a simple prototype of a ferroelectric crystal we treat a system of coupled anharmonic oscillators in order to determine the range of applicability of different self-consistent approximation schemes. In particular, we examine the self-consistent phonon approximation with an intercell coupling which possesses a variable range of interaction. In the limit where the interaction is of sufficiently long range, the density matrix of the system is obtained numerically exactly. © 1974, Taylor & Francis Group, LLC. All rights reserved.
Xikun Hu, Wenlin Liu, et al.
IEEE J-STARS
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MRS Fall Meeting 2020
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