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- W3201239847 abstract "We propose a versatile approach to treat commonly arising constraints. It is illustrated for interacting magnons of the Heisenberg antiferromagnet on a square lattice. For systems of $Lifmmodetimeselsetexttimesfi{}L$ sites a nonperturbative continuous unitary transformation (CUT) is used to derive an effective Hamiltonian conserving the number of magnons. They are bosonic particles with a hard-core constraint which is captured by a local, repulsive interaction $U$. The limits $Uensuremath{rightarrow}ensuremath{infty}$ and $Lensuremath{rightarrow}ensuremath{infty}$ are achieved by extrapolation. The residual spin gap ${ensuremath{Delta}}_{1}$ is smaller than $0.01J$ reflecting the gapless nature of the magnons. The one-magnon dispersion displays all known characteristics." @default.
- W3201239847 created "2021-09-27" @default.
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- W3201239847 date "2006-05-12" @default.
- W3201239847 modified "2023-10-14" @default.
- W3201239847 title "Hard-core magnons in the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn><mml:mo>∕</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:math>Heisenberg model on the square lattice" @default.
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- W3201239847 doi "https://doi.org/10.1103/physrevb.73.172407" @default.
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