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Deep center in Al 0.3 Ga 0.7 As

1991; American Physical Society; Volume: 43; Issue: 14 Linguagem: Inglês

10.1103/physrevb.43.12126

1095-3795

W. Patrick Roach, M. Chandrasekhar, H. R. Chandrasekhar, F. A. Chambers,

Quantum and electron transport phenomena

We report the observation of a new trapping center in ${\mathrm{Al}}_{0.3}$${\mathrm{Ga}}_{0.7}$As. The center becomes active under a hydrostatic pressure of \ensuremath{\sim}45 kbar, and has an unusually deep emission barrier. It quenches all radiative transitions and causes a hysteresis in the photoluminescence intensity, which we interpret via a lattice-relaxation model. It is neither the DX nor the SD center, and probably related to a donor.