title: Haldane phase in the Hubbard model at 2/3-filling for the organic molecular compound Mo3S7(dmit)3.
abstract: 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 Mo3S7(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 weak electron-electron interactions (U), is adiabatically connected to the Haldane phase and is consistent with experiments on Mo3S7(dmit)3.
authors.affiliation: Centre for Organic Photonics and Electronics, School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland 4072, Australia and Centre for Engineered Quantum Systems, School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland 4072, Australia.
authors.forename: C
authors.initials: C
authors.lastname: Janani
authors.affiliation: Departamento de Física Teórica de la Materia Condensada, Condensed Matter Physics Center (IFIMAC) and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, Madrid 28049, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Merino
authors.affiliation: Centre for Engineered Quantum Systems, School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland 4072, Australia.
authors.forename: I P
authors.initials: IP
authors.lastname: McCulloch
authors.affiliation: Centre for Organic Photonics and Electronics, School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland 4072, Australia.
authors.forename: B J
authors.initials: BJ
authors.lastname: Powell