Lifshitz phase transitions in one-dimensional Gamma model
Zi-An Liu,
Tian-Cheng Yi,
Jin-Hua Sun
et al.
Abstract:In this paper, we study quantum phase transitions and magnetic properties of a one-dimensional spin-1/2 Gamma model, which describes the off-diagonal exchange interactions between edge-shared octahedra with strong spin-orbit couplings along the sawtooth chain. The competing exchange interactions between the nearest neighbors and the second neighbors stabilize semimetallic ground state in terms of spinless fermions, and give rise to a rich phase diagram, which consists of three gapless phases. We find distinct … Show more
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