Tuning a single hopping parameter through a higher-order Van Hove singularity changes the predicted ordered state of the square-lattice Hubbard model, and ferromagnetism at Van Hove filling is destroyed by very small doping.
There are thus only four in- dependent susceptibilities
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Engineering correlated phases through manipulation of Van Hove singularities
Tuning a single hopping parameter through a higher-order Van Hove singularity changes the predicted ordered state of the square-lattice Hubbard model, and ferromagnetism at Van Hove filling is destroyed by very small doping.