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New Type of Degenerate Quantum Spin Phase

Masatoshi Imada·Takahiro Mizusaki·Shinji Watanabe
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Abstract

Correlated electrons often crystalize to the Mott insulator usually with some magnetic orders, whereas the "quantum spin liquid" has been a long-sought issue. We report numerical evidences that a nonmagnetic insulating (NMI) phase gets stabilized near the Mott transition with remarkable properties: The 2D Mott insulators on geometrically frustrated lattices contain a phase with gapless spin excitations and degeneracy of the ground state in the whole Brillouin zone of the total momentum. It has an interpretation for an unexplored type of a quantum liquid. The present concept is useful in analyzing a variety of experimental results in frustrated magnets including organic BEDT-TTF compounds.

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Masatoshi Imada, Takahiro Mizusaki, Shinji Watanabe. 2003-07-01. New Type of Degenerate Quantum Spin Phase. https://arxiv.org/abs/cond-mat/0307022

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