Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-06-27
EPL 97, 27004 (2012)
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 6 figures. Updated version that has been submitted to Europhysics Letters
Scientific paper
10.1209/0295-5075/97/27004
Using the self-consistent Born approximation we study the delocalization of interlayer excitons in the bilayer Heisenberg quantum antiferromagnet. Under realistic conditions we find that the coupling between the exciton motion and the spin system is strongly enhanced as compared to the case of a single carrier, to a degree that it mimics the confinement physics of carriers in Ising spin systems. We predict that the "ladder spectrum" associated with this confinement physics should be visible in the c-axis exciton spectra of insulating bilayer cuprates such as YBa2Cu3O6. Our discovery indicates that finite density systems of such excitons should show very rich physical behavior.
Hilgenkamp Hans
Rademaker Louk
Wu Kai
Zaanen Jan
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