A Question: Quantum Critical Phenomena in XY Spin-Chain Systems With Dzyaloshinskii-Moriya Interactions

TL;DR

This paper investigates how Dzyaloshinskii-Moriya interactions affect quantum critical phenomena in XY spin-chain systems, finding that they influence the energy spectrum but not the critical points or phase transition regions.

Contribution

It demonstrates that Dzyaloshinskii-Moriya interactions do not alter the critical magnetic field or induce new critical regions in XY spin chains, using diagonalization and geometric phase analysis.

Findings

DM interaction affects energy spectrum but not critical points

Critical magnetic field remains unchanged by DM interaction

No new critical regions induced by DM interaction

Abstract

Jordan-Wigner transformation and Bogolyubov transformation are the main steps of the diagonalization of Hamiltonian and paly an important role in the statistical mechanics calculations for one-dimensional Heisenberg spin chain model. Many methods can be exploited as a tool to detect quantum phase transition, regions of criticality and scaling behavior in the vicinity of a quantum phase transition, such as geometric phase, fidelity susceptibility, order parameter, and entanglement entropy, which have direct relation with Bogolyubov transformation. We diagonalized the Hamiltonian in XY spin-chain systems with Dzyaloshinskii-Moriya interactions, the results shows that only the energy spectrum but not the coefficients of the Bogolyubov transformation depends on DM interaction. Therefore, the DM interaction may not influence the critical magnetic field of quantum phase transitions and not induce new critical regions in the XY spin model. Moreover, we further prove the ideas by the methods of geometric phases in this model.