Magnetoluminescence study on the effective mass anisotropy of CuPtB-ordered GaInP2 alloys

Abstract

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Magnetophotoluminescence of quantum confined states in orderedGaxIn1−xPwith

“…3. The multiplicative effect of the effective mass anisotropy, 6 which gives a ratio of roughly 1.6 for ϳ0.42, would easily extend the range of our measurements to encompass the range reported in Ref. 3.…”

“…In previous studies of this and other similarly prepared samples, these lines typically show minimal thermal broadening and multiple energetically narrow absorption peaks, 8 both signatures of quantum confinement. In the magneto-PL measurements that will be discussed here, the diamagnetic shifts for these lines are significantly less than 15 eV/T 2 measured for the bulk band-edge excitonic states, 6 giving further evidence of quantum confinement. However, no clear evidence for excited state emission was found in the study of Ref.…”

“…4,5 However, a model of the microscopic origin of these states requires a detailed knowledge of their microstructure, which is complicated by the presence of alloy fluctuations and the ordering-induced anisotropy in these materials. 6 By surveying the magneto-optical properties of these transitions, one can place constraints on their origin. We observe variations in the diamagnetic shift and Zeeman splitting both for select lines which appear within a single aperture and from one aperture to the next.…”

Doping dependence and anisotropy of minority electron mobility in molecular beam epitaxy-grown p type GaInP

“…2 The observation of the strong transport anisotropy in MBE-grown GaInP raises obvious questions as to its origin. Two possibilities are Cu-Pt ordering, which has previously been shown to produce transport anisotropy in GaInP, 1,10 and compositional modulation. 11,12 Although commonly observed at the higher temperatures associated with metalorganic chemical vapor deposition (MOCVD) growth, Cu-Pt ordering has also been observed in solid source MBE-grown material.…”

Measurement of conduction band minima in ordered and disordered GaInP

“…[13] and an exciton binding energy correction of 10 meV independent of ordering [14] is added to the PL energy of low-temperature data. Given DE BGR a value for Z can be calculated from Ref.…”