Near-field imaging of one-dimensional excitons delocalized over mesoscopic distances

Near-field optical spectroscopy is used to investigate the effects of disorder in the optical processes in semiconductor quantum wires. We observe photoluminescence emissions from extended, delocalized excitons at low temperatures (5 K) and low excitation densities. Combining high spectral and spatial resolution, we isolate homogeneous emission lines from excitons delocalized over distances up to 600 nm in the fundamental state. The energies of the emissions are consistent with different quantum spatial confinements along the win axis. Unlike the photoluminescence originating from localized excitons, these emission lines show a high degree of polarization along the axis of the wire.


Published in:
Physical Review B, 63, 12, 121313
Year:
2001
ISSN:
1098-0121
Keywords:
Note:
Ecole Polytech Fed Lausanne, Swiss Fed Inst Technol, Dept Phys, CH-1015 Lausanne, Switzerland. Electrotech Lab, Tsukuba, Ibaraki 3058568, Japan. Crottini, A, Ecole Polytech Fed Lausanne, Swiss Fed Inst Technol, Dept Phys, CH-1015 Lausanne, Switzerland.
ISI Document Delivery No.: 416XW
Times Cited: 17
Cited Reference Count: 28
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 Record created 2007-08-31, last modified 2018-03-17


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