By incorporating a large-scale shear flow into turbulent rotating convection,we show that a sufficiently strong shear can promote dynamo action in flowsthat in the absence of shear do not act as dynamos. Our results are consistentwith a dynamo driven by either the shear-current effect or by the interactionbetween a fluctuating $\alpha$-effect and the velocity shear; they are thoughinconsistent with either a classical $\alpha^2$ or $\alpha \omega$ mean fielddynamo.
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