1. String excitations in quantum antiferromagnets and photoelectron spectroscopy E. Manousakis Physics Department, Florida State University and Physics Department, University of Athens, Greece

2. Graf et al., Phys. Rev. Lett 98, 067004 (2007)

3. Extensions: t-t’-t”-J model What are the “string” excitations The hole in an antiferromagnetically correlated background feels a linear potential as it moves away from its birth site.

5. Spectral function t-J model, J/t=0.3 t=0.4eV k: (0,0) to (  )

6. Spectral function t-t’-t”-J model, k: (0,0) to (  Parameters the same as in Kim et al. PRL 80, 4245 (98).

7. Spectral function t-J model, J/t=0.3 t=0.4eV k: (0,0) to ( ,0)

8. Spectral function t-t’-t”-J model, k: (0,0) to  )

9. Comparison with Ronning et al. PRB 71, 094518 (2005)

10. Ronning et al. t-J model t-t’-t”-J model

11. Graf et al., Phys. Rev. Lett 98, 067004 (2007) t-J model

12. Connected string states up to 4 hops

18. Conclusions