Edge modes in a frustrated quantum Ising chain

Abstract

The ground state properties of an Ising chain with nearest ($J_1$) and next-nearest neighbor ($J_2$) interactions in a transverse field are investigated using the density matrix renormalization group and cluster mean-field theory methods. Its quantum phase diagram has two ordered regions (separated by a quantum disordered phase), one of which has simple ferromagnetic or Néel order depending upon the sign of $J_1$, and the other is the double-staggered antiferromagnetic phase. The presence of the Majorana-like edge-modes in these ordered phases is inferred by calculating the end-to-end spin-spin correlations on open chains. It is found that there occur four edge modes in the double-staggered phase, while the ferromagnetic and Néel phases support two edge modes, except very near $J_1=0$ where it seems they have four edge modes like the exact case at $J_1=0$ itself.

8 pages, 13 figures

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