Microscopic model versus systematic low-energy effective field theory for a doped quantum ferromagnet
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Gerber-2010-Microscopic model versus systematic low-energy effective field theory for a doped quantum ferromagnet.pdf
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Author(s)
Gerber, U.
Hofmann, C. P.
Kampfer, Florian
Wiese, U. J.
Date Issued
February 2010
Journal
Physical Review B
Publisher
American Physical Society
Citation
Gerber, U. et al. “Microscopic Model Versus Systematic Low-energy Effective Field Theory for a Doped Quantum Ferromagnet.” Physical Review B 81.6 (2010) : 064414. © 2010 The American Physical Society
Version
Final published version
Abstract
We consider a microscopic model for a doped quantum ferromagnet as a test case for the systematic low-energy effective field theory for magnons and holes, which is constructed in complete analogy to the case of quantum antiferromagnets. In contrast to antiferromagnets, for which the effective field theory approach can be tested only numerically, in the ferromagnetic case, both the microscopic and the effective theory can be solved analytically. In this way, the low-energy parameters of the effective theory are determined exactly by matching to the underlying microscopic model. The low-energy behavior at half-filling as well as in the single- and two-hole sectors is described exactly by the systematic low-energy effective field theory. In particular, for weakly bound two-hole states the effective field theory even works beyond perturbation theory. This lends strong support to the quantitative success of the systematic low-energy effective field theory method not only in the ferromagnetic but also in the physically most interesting antiferromagnetic case.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.81.064414
