OPTICAL ANISOTROPY IN 5-NM-SCALE T-SHAPED QUANTUM WIRES FABRICATED BYTHE CLEAVED-EDGE OVERGROWTH METHOD

Optical anisotropy has been evaluated in terms of polarization depende nce of photoluminescence (PL) and PL excitation (PLE) spectra for 5-nm -scale GaAs/AlAs T-shaped quantum wires (T-QWR's). They were prepared by the cleaved-edge overgrowth method, and their potential profile was previously characterized by spatially resolved PL measurements. The P L and PLE signals for T-QWR's showed stronger polarization along the T -QWR's. Comparing T-QWR's with a reference QW grown on a (110) surface , we clarified the optical anisotropy induced purely by the lateral co nfinement in T-QWR's.