Optical absorption of spin ladders

Authors
Jurecka, C Brenig, W
Citation
C. Jurecka et W. Brenig, Optical absorption of spin ladders, PHYS REV B, 61(21), 2000, pp. 14307-14310
Citations number
12
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
61
Issue
21
Year of publication
2000
Pages
14307 - 14310
Database
ISI
SICI code
0163-1829(20000601)61:21<14307:OAOSL>2.0.ZU;2-L
Abstract
We present a theory of phonon-assisted optical two-magnon absorption in two -leg spin ladders. Based on the strong intra-rung-coupling limit we show th at collective excitations of total spin S = 0, 1, and 2 exist outside of th e two-magnon continuum. It is demonstrated that the singlet collective stat e has a clear signature in the optical spectrum.