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Haldane Phase in the Hubbard Model at 2/3-Filling for the Organic Molecular Compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Mo</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">S</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mi>dmit</mml:mi><mml:mo stretchy="false">)</mml:mo…
We report the discovery of a correlated insulator with a bulk gap at 2/3 filling in a geometrically frustrated Hubbard model that describes the low-energy physics of ${\mathrm{Mo}}_{3}{\mathrm{S}}_{7}{(\mathrm{dmit})}_{3}$. This is very different from the Mott insulator expected at half-filling. We show that the insulating phase, which persists even for very …