Geometric phase and quantum phase transition in an inhomogeneous periodic XY spin-1/2 model

Abstract

The notion of geometric phase has been recently introduced to analyze the quantum phase transitions of many-body systems from the geometrical perspective. In this work, we study the geometric phase of the ground state for an inhomogeneous period-two anisotropic XY model in a transverse field. This model encompasses a group of familiar spin models as its special cases and shows a richer critical behavior. The exact solution is obtained by mapping on a fermionic system through the Jordan-Wigner transformation and constructing the relevant canonical transformation to realize the diagonalization of the Hamiltonian coupled in the $k$-space. The results show that there may exist more than one quantum phase transition point at some parameter regions and these transition points correspond to the divergence or extremum properties of the Berry curvature.

6 pages, 3 figures. As a backup of a previous work and some typos in the published version are fixed

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Cited by in corpus (5)

• Geometry of quantum phase transitions
• Abelian and Non-Abelian Quantum Geometric Tensor
• Conventional quantum phase transition driven by complex parameter in non-Hermitian PT-symmetric Ising model
• Quantum distance and the Euler number index of the Bloch band in a 1D spin model
• Quantum geometric tensor and the topological characterization of the extended Su-Schrieffer-Heeger model