Journal Title

Physical Review E

Publication Date

2014

Abstract

We use entanglement entropy and finite-size scaling methods to investigate the ground-state properties of a spin-1/2 Ising chain with two-spin (J2) and four-spin (J4) interactions in a transverse magnetic field (B). We concentrate our study on the unexplored critical region B = 1 and obtain the phase diagram of the model in the (J4J2) plane. The phases found include ferromagnetic (F), antiferromagnetic (AF), as well as more complex phases involving spin configurations with multiple periodicity. The system presents both first- and second-order transitions separated by tricritical points. We find an unusual phase boundary on the semi-infinite segment (J4 < —1, J2 = 0) separating the F and AF phases.

Subjects

Magnetic fields; Phase Transition; Quantum Theory

Publication Information

Physical Review E, 2014, Volume 90, Issue 3, 1-7.

© 2014 American Physical Society

Archived version is the final published version.

DOI

10.1103/PhysRevE.90.032101

Peer-Reviewed

Yes

Document Type

Journal Article

Included in

Physics Commons

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