Entanglement and level crossings in frustrated ferromagnetic rings

TL;DR

This paper investigates how entanglement properties in finite frustrated ferromagnetic spin chains reveal level crossings and incommensurate physics, offering new insights beyond traditional correlation measures.

Contribution

It introduces entanglement signatures associated with level crossings in finite frustrated spin chains, emphasizing multi-spin measures over traditional correlation functions.

Findings

Entanglement signatures clearly mark level crossings.

Multi-spin entanglement measures provide unique insights.

Traditional correlation functions offer complementary information.

Abstract

We study the entanglement content of a class of mesoscopic tunable magnetic systems. The systems are closed finite spin-1/2 chains with ferromagnetic nearest-neighbor interactions frustrated by antiferromagnetic next-nearest-neighbor interactions. The finite chains display a series of level crossings reflecting the incommensurate physics of the corresponding infinite-size chain. We present dramatic entanglement signatures characterizing these unusual level crossings. We focus on multi-spin and global measures of entanglement rather than only one-spin or two-spin entanglements. We compare and contrast the information obtained from these measures to that obtained from traditional condensed matter measures such as correlation functions.