SPATIALLY-RESOLVED PHOTOLUMINESCENCE STUDY ON T-SHAPED QUANTUM WIRES FABRICATED BY CLEAVED EDGE OVERGROWTH METHOD

We have fabricated GaAs T-shaped edge quantum wire (T-QWR) structures by the cleaved edge overgrowth method. The geometries of the samples w ere designed in such a way that we can separately detect photoluminesc ence (PL) from T-QWRs as well as two adjacent quantum wells (QWs) from spatially resolved PL measurements. Each PL peak is unambiguously ass igned and analyzed to precisely determine the quantized energy of exci tons in T-QWRs and the adjacent QWs. Special care is made in the cleav age and the growth procedures to realize sharp and efficient PL from t hese structures. (C) 1996 American Institute of Physics.