The Berry phase: a topological test for the spectrum structure of frustrated quantum spin systems

Details The Berry phase: a topological test for the spectrum structure of frustrated quantum spin systems The Berry phase: a topological test for the spectrum structure of frustrated quantum spin systems

2008-07-17

arxiv.org/abs/0807.2720v1

PLA 372 (2008) 5352 - 5355

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 1 figure

Scientific paper

10.1016/j.physleta.2008.06.016

The nature of the low energy spectrum of frustrated quantum spin systems is investigated by means of a topological test introduced by Y. Hatsugai which enables to infer the possible existence or absence of a gap between the ground state and excited states of these systems. The test relies on the determination of an order parameter which is a Berry phase. The structure of the spectra of even and odd-legged systems in 2d and 3d is analyzed. Results are confronted with previous work.

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